Mega Notes Set

Chapter 1 How to Be a Centenarian 1/7/26

Want to live longer chronologically but younger physiologically 



Input equals output

  • Calories in means calories out 

  1. This is a failed model 


Exercise is very beneficial and important but to lose weight it does not work well. To lose weight focus on the input 


Counting calories doesn't work well

  •  what the type of calorie does to our body 


Obesity

  • Does not meet criteria to be classified as a disease 

  • Serves as indicator for numerous lifestyle related illnesses 

  • Excessive accumulation of body fat 


How Do you define obesity

  • Waist circumference

  1. Looks at belly fat 

  2. Upper bone of hip and measure around abdomen 

  3. Flaw: only looking at abdominal fat 


  • Body fat percentage

  1. Flaw: compared to water so if you drank a lot of water you will get a low number vs if you're dehydrated you get a low number. Very hydration dependent 

  • BMI

  1. Notes below 

  • DEXA

  1. Visceral vs subcutaneous fat

  2. Visceral is correlated with health problems 

  • skin fold measurement

  1. Good for subcutaneous fat measurements


Males

  • 40 inch or 102 cm waist circumference  or greater considered obese

  • 25% or greater body fat percentage considered obese 


Women

  • 35 inch or 88 cm or greater considered obese 

  • 30% or greater body fat percentage considered obese 



BMI 

  • Completely flawed 

  • 18.5 - 24.9 is considered healthy

  • 25 - 29.9 is considered overweight 

  • 30 or greater is considered obese

  • Weight (kg)/ height (m)^2

  • Does not measure body fat 

  1. Not ideal for body builders 



DEXA

  • Visceral fat 

  1. Develops around organs 

  2. Very dangerous 

  3. Metabolically active

  • Asks for more 

  • Like a live mass

  • Subcutaneous fat 

  1. Develops under the skin 

  2. We all have this 

  3. Very stubborn, hard to lose easy to gain 


Diet is much more important than exercise 

Focus on the quality of food not the quantity



Lecture Notes 1/12/26 

Food pyramid

  • Everything with fat is bad but that isn't true

  • Cereal became a big thing and that industry took off 


Newest pyramid includes butter, oil, healthy fats 


Diseases

  • Acute

  1. Beginning, short period of sickness, and end. Within a set time frame 

  2. Ex: flu, cold

  3. Amendable to one shot solution 

  • Contamination of water (sanitation)

  • Polio (vaccination)

  • Chronic 

  1. Not cured only managed

  2. Begin early in life before clinical symptoms appear 


RIsk factor of cardiovascular diseases: Tobacco 

  • Inflammation 

  • Carcinogens 

  • Prolonged inflammation makes blood vessels unstable, heart unstable 


RIsk factor of cardiovascular diseases: Lipids

  • Trans fat 

  1. Damaging to heart 

  2. Synthetic fat made by food companies 

  • Omega 6 fat

  1. Large quantities make it bad

  2. Natural molecule 

  3. Body needs it 


RIsk factor of cardiovascular diseases: Hypertension

  • High blood pressure so blood vessels under lots of stress

  • Managed by physical activities and medication needed

  • Can cause kidney damage 


RIsk factor of cardiovascular diseases: Physical Inactivity 

  • Don't need to go to the gym just walk or do something to say active 


RIsk factor of cardiovascular diseases: Diabetes

  • Sugar management

  1. Most people arent doing this

  • Complications

  1. Blindness 


RIsk factor of cardiovascular diseases: Obesity and Diet 

  • Quality and quantity  


Alcohol

  • Moderate consumption 

  • Can lead to heart disease

  • Causes liver damage which leads to inflammation 


Stress

  • Very bad

  • Defined as anything you are not used to 

  • Releases unwanted hormones 


Exercise Lecture 

Clickers 

  • Movement of the food from the digestive organ into the blood is called absorption not digestion 

  • Meat does not contain carbohydrates but milk does 


Aerobic 

  • High repetition 

  • Low intensity exercise


Anaerobic 

  • Low repetition 

  • High intensity exercise


Adaptation

  • The changes and benefits you receive from exercise

  • Both aerobic and anaerobic give different adaptations 

  • Refer to them as systematic: affect diff locations in the body


Need stress 


Clicker

Which vitamin is not stored in the body 

  1. Vitamin A

  2. Vitamin C

  3. Vitamin D

  4. Vitamin E

  5. Vitamin K


Vitamin B and C are water soluble the rest are fat soluble 


Studying exercise involves: 

  • Strength - force

  • Power - how fast muscles respond to large force 

  • Endurance - time 

  • Flexibility - range of motion


Stress vs adaptation

Adaptation is the response to exercise


More stress = more adaptation 

Physiological changes to increase performance 


General  adaptation syndrome 

  • Tracking changes in our body 

  • Alarm phase: 

  1. Increase activity during exercise 

  2. Heart rate increases and stronger beat 

  3. Respiratory rate increase 

  4. Blood vessels expand (vasodilation) 

  • Resistance phase

  1. After exercise

  2. More adaptation to the heart 

  3. Storage capacity in muscles increase (increase more nutrients)

  4. More vascularization 

  5. More mitochondria produced 

  • Exhaustion phase

  1. Fracture, sprains (joint), strains (muscles) 

  • Want to alternate between first two stages


Muscle Adaptation:

  • Skeletal muscles undergo significant modifications in response to stress


To optimize adaptation, it is important to account for

  • The overload principle

  1. In order for muscles to adapt and develop their strength and power they must be worked to their utmost capacity 

  2. Repetition maximum (RM)

  • Maximum amount of weight you can lift in a single exercise 

  • So only one bench press as example 

  • Every person different 

  • For aerobic not strength use Heart rate max is 220 - your age 

  1. Beginners used 60ish percent of max 

  1. Hypertrophy 

  • Force

  • Velocity 

  1. DOMS

  • Delayed onset muscle fatigue aka soreness 

  • Specificity 

  1. Specific muscle activity or exercise like doing bench press u expect change to happen to pecs and shoulders and biceps but not like the neck or something

  2. What is your objective

  • Individual principles 

  1. Age, sex, fitness, genetics 



Resistance training adaptation

  • Intensity of work out contingent upon weight of the load 

  • Increased loads will result in greater muscle adaptation 

  1. Cross bridges

  • Part of the proteins that help carry the weight 

  1. Motor units 

  • Group of neurons that control your muscles

  • Interrupt as more coordination in muscles control

  • Adaptation in the muscles

  • Some system adaptations are smaller 

  • You need energy aka fuel aka ATP 

  1. Need oxygen and nutrients such as fat and carbohydrates 

  • Muscles are packets of proteins 

  • Increases protein synthesis 

  • Actin and myosin are proteins 

  1. Found only in muscles


Aerobic training adaptation 

  • Some muscles

  • System adaptations are greater

  • Vo2 max

  • Cardiac output

  • Heart rate

  • Stroke volume

  • Circulation

  • Respiration 



Clicker questions

Diabetes is a disease that leads to low plasma blood sugar 

  • False, it increases blood sugar 


When measuring blood pressure there are 2 numbers to look for diastole and systole 

  • True , systole is over diastole 


Which of the following refers to how fast a muscle can produce force

  • Duration - endurance 

  • Intensity

  • Power

  • Flexibility - range of motion 

  • Strength



Lecture 1/16

 CO = amount of blood that is ejected from the heart (liters per min)


Heart Rate = how fast


Stroke volume = how strong 


CO = HR x stroke volume

L/min  B/min  liters/beat 


L/min = liters per minute 

B/min = beats per minute

liters/beat 



5 to 6 liters of blood in body

Goes through the heart in a minute


Vasoconstriction 

Vasodilation 


 Lungs 

  • Bronchio constriction (narrow airways)

  • Bronchio dilation (wider airways)


Clicker Questions: 

Who will have higher HRmax?

  • Untrained person 

  • Trained person 

  • They have the same


Exercise is beneficial because it delays HRmax. Everyone has the same HRmax doesn't matter whether you exercise regularly or not but those who are trained take longer to hit it. 


The higher the stress in skeletal muscles during exercise the more the adaptation

  • True

  • False 


Increase in muscle cell diameter in response to exercise is termed

  • Hypertrophy

  • Hyperplasia

  • Hypotrophy

  • Hypoplasia

  • Atrophy 



WHat is repetition maximum 

  • Maximum amount of weight an individual can lift in a single exercise 



Cardiovascular System Lecture 1/21/26


  • Congenital: something someone is born with such as heart defect 

  1. Serious and important but not significant amount of death 

  • Atherosclerosis

  1. Blood vessels start building fat deposits leads to heart stopping or stroke 

  • Hypertension 

  1. force of blood against artery walls is consistently too high, making the heart work harder and damaging vessels over time, potentially leading to heart attack, stroke, and kidney disease


Event: something that requires hospitalization 

  • Brain or heart stopped 

  • Problems usually stem from the blood vessels not the heart that's just the outcome 


Three parts of cardiovascular system 

  • Heart (cardiac muscle)

  1. pump

  • Blood vessels (conduit)

  • Blood (plasma, cells)


Nourishes your cells - oxygen and energy molecules

Picks up waste from cells 

Cardiovascular system is a closed system that transports blood to the entire body via blood vessels


Pick up and carries oyxgen and carbon dioxide 

Pulmonary circuit 

  • Heart lung constant exchange 

  • Less effort as lungs are nearby 


Systemec circuit

  • Heart and systems within our body

  • More force needed due to longer distance from heart such as feet or above gravity like brain 


The heart

  • Four different chambers 

  • Blood never backs up 

  • Ateria (top chambers)

  1. Called input or receiving chambers 

  • Ventricles (bottom chambers)

  1. Output or pumping chambers 

  • Always circuits from atria to ventricles 

  • Right atrium (blood from body) to right ventricle( goes to lungs)

  • Left atrium (blood from lungs) to left ventricle (blood going to body)

  • Left ventricle always has most muscle mass 


Called heart attack but really its a blood vessel failure 


RA | LA

______


RV | LV


Heart Cycle

  • Diastole: heart relaxed

  • Systole: heart contracted

Blood pressure

  • Ventricular systole: BP high

  • Ventricular diastole: BP low 

  • 120mmHG/80 mmHg 


Heart Output

Cardiac output = heart rate x stroke volume

CO: amount of blood ejected from the heart every minute (L/min)

HR: beats per min (BMP)

SV: amount of blood ejected from the heart every beat (L/B)

CO = 5 L/m at rest; CO = 20 L/m during exercise 


Blood Vessels 

iClicker Questions 

As the heart increases the VO2 max also increases

  • True


What constitute the cardiovascular system

  • Heart, blood, and blood vessels 


What is systole 

  • Heart Contraction 



Lecture 1/23


We want efficient delivery and timely delivery with blood vessels


Blood Vessel Structure 

Lume: cavity where blood flow

Three layers:

  1. Tunica intima

  • Inner layer, in direct contact with blood 

  • Endothelial cells; single layer, smooth produce nitric oxide-vasodilator 

  • Smooth to minimize friction

  • Nitric oxide allows us to pinpoint where we want the constriction and dilation 

  1. Tunica media

  • Smooth muscles, involuntary, vasoconstriction and vasodilation

  • Dilation used more than constriction 

  1. Tunica externa

  • Elastic tissue 


Blood vessel is never fully shut 


Artery and arteriole take blood away from heart

  • They are thick can get to the tissue but need substances to move from blood stream to tissue that was caps are for 

Veins and venule take blood to the heart 


Capillaries 

  • Site of exchange 


Blood

  • Cellular components

  1. Erythrocytes (RBC), leukocytes (WBC), platelets 

  • Plasma - fluid

  1. Water

  2. Ions

  3. Hormones

  4. Proteins

  5. Nutrients: glucose, amino acids, lipids (lipids not water soluble)

 water soluble so travel easily in blood 


To transport lipids we need to package them 

  • The outside package can mix with water so travel in blood 

  • Big differences in dietary lipids (what we eat) and the packaged lipids (produced by body) in our blood 


Vesicles (package)

  • Chylomicrons: carry dietary lipids from small intestine to liver

  • VLDL: produced in liver: lipids processed in the liver: triglycerides and cholesterol carry lipids from liver to tissue

  • LDL: formed in blood, derived from VLDL. carries lots of cholesterol and few triglycerides

  • HDL: produced in the liver and function to collect cholesterol from tissue back to liver 


VLDL: very low density lipoprotein

LDL is converted VLDL 


LDL is culprit for vascular diseases 

  • Can become unstable and break down 


LDL sad face

HDL happy face 


Iclicker questions: 

The proteins that contract in muscles are called

  • Actin and myosin 


Optimal rest periods during training sessions are crucial to delaying DOMS

  • True 


Vasoconstriction occurs in the heart 

  • True 


Lecture 1/26 

Heart disease start with plaque formation (fat deposits) in blood vessels resulting in occlusion, 


Atherosclerosis 

  • LDL oxidation 

  • Vesicles break down and start building up on side of blood vessel 

  • Progressive disease, worsens with time 

  • When diagnosed they don't look at size of plaque they look at the stability of it 

  • No one size fits all



Stages of Atherosclerosis: Initiation of a lesion

  • every individual has LDL in their circulation 

  • Individuals who consume high caloric diet (high sugar diet) will have high levels of LDL cholesterol 

  1. LDL produced in liver

  • In an unhealthy diet the liver produces:

  1. More LDL

  • Produces good and bad LDL and why does it now produce bad? Because liver is diseased due to sugar consumption

  1. Smaller size LDL more susceptible to oxidation 

  • LDL is trapped in blood vessels

  • HDL is produced by liver and is protective 

  1. Get rid of the contents of LDL in blood stream 


Thrombus formed when platelets and fibers adhere to each other resulting in clot within blood vessel which has the potential to obstruct blood flow resulting in heart attack or stroke 


Stages of Atherosclerosis: Inflammation and Foam-Cell Formation

Recruitment of immune cells

  • Macrophages, lymphocytes

  1. Clear the vesicles from circulation 

  2. However they can get overwhelmed by amount of LDR and break down 

  3. When macrophages break down we call them foam cells 

  • Phagocytic cells (engulfing)

  • Macrophages become overwhelmed transforming into foam cells

  • They add calcium as part of the repair but this makes blood vessel lose flexibility


Inchemia: poor circulation 


Stages of Atherosclerosis: Fibrous Plaque Formation

More aggressive response from the immune system

  • Chronic inflammation

  • Stabilize the plaque by depositing fibers to harden the plaque to prevent it from rupture

  • Flow impedance (occlusion) that results in ischemia (scar tissue)


Stages of Atherosclerosis: Plaque rupture: Clinical Event

  • Clot formation (coagulation)

  • Myocardial infarction (heart attack)

  1. Coronary blood vessel 

  • Stroke

  1. Blood vessels in brain 



iClicker Questions

  • Arteries have 3 layers


Nitric Oxide is released from

  • tunica intima of the blood vessel 


Nitric Oxide acts on 

  • Tunica media of blood vessel (causes vasodilation) 


1/28 Lecture 


Blood test

  • Lipid profile

  • Lipid panel 

  • Inflammatory markers


How to Diagnose Cardiovascular Diseases

  • Doctor’s visit

  • Noticeable risk factors

  1. Obesity, stress, hypertension

  • Blood test: Lipid profile

  1. Total cholesterol (less than 200 mg/dL)

  • Most irrelevant number, does nothing 

  1. LDL cholesterol (less than 100 mg/dL -100-129; 130-159- borderline; 160 or greater- high risk)

  2. HDL cholesterol: 60 mg/dL or greater

  3. Triglycerides: less than 150 mg/dL

  4. LDL: HDL ratio (below 3.5: 1)

  • Triglycerides: HDL ratio (1:1) (2:1)

  • Blood test: Inflammatory markers: CRP, interleukin

  • Emergency room visit:

  1. MI

  2. Angina pectoris (chest pain)


Different types of LDL

  • Regular large vesicles (body needs these)

  • Small vesicles (highly associated with cardiovascular diseases) 




Imaging/Tests

  • EKG

  1. Stress test

  • Anglography 

  1. Take picture of blood vessel 


Surgical Options

  • Angioplasty 

  • Coronary artery Bypass graft 


iClicker Questions


What is found in the blood of a patient with heart disease 

  • LDL

  • HDL

  • Chylomicrons

  • Glucose 


What is found in the blood of a patient with heart disease 

  • LDL

  • HDL

  • Chylomicrons

  • Glucose 


We all have these normal or not the values are just different depending on if you have heart disease 


1/30 Lecture

  • Risk Factors of Cardiovascular Diseases

  • Sedentary

  • Do not exercise

  • Consuming lots of alcohol

  • Not consuming omega 3

  • Consuming lots of omega 6

  • Not consuming fruits and vegetables

  • Smoking (carcinogens- free radicals- reactive oxygen species)

  • Consuming lots of trans fat

  • Being overweight or obese

  • Prolonged inflammation


Medications

Statins

  • Lower LDL cholesterol 

  • Reduce and prevent inflammation 


What are vitamins

  • Carbon containing compounds

  • Chemicals needed for metabolism

  • Essential

  • Hydrophobic and hydrophilic 


Vitamin A (hydrophobic)

  • retinol/retinal

  • Plays crucial role of functioning of photoreceptors

  • Reproduction 


Vitamin D (hydrophobic)

  • Cholecalciferol

  • Absorbs calcium

  • Important for bones


Vitamin E (hydrophobic)

  • Tocapherol

  • Antioxidants 


VitaminC

  • Antioxidant 


Vitamin B

  • Amino acids 


I Clicker


CO = HR x SV


How does cholesterol travel in the blood

  • In LDL vesicle and HDL vesicles and VLDL vesicles 


What involves the insertion of a catheter

  • stent, and angiography 


Which is a newly emerged variable to measure in the blood and assess risk of cardiovascular disease

  • CRP, triglycerides, HDL, and LDL





2/2/26 Lecture - Midterm Review


Chapter 1

  • Most common causes of death

  1. 1900 - acute diseases

  2. Present day - chronic diseases 

  • Diet and lifestyle

  • Lifestyle and age


Obesity Measurement

  • Bmi values and categories


General nutrients

  • Carbohydrates

  • Proteins

  • Lipids 


Risk factors of CVD

  • Tobacco (death caused by tobacco use)

  • Hypertension (what is the value)

  • Physical inactivity

  • Diabetes (leading to blindness)

  • Obesity

  • Diet (current vs recommended)


Chapter 2: Why do we need to exercise

  • Stress and adaptation

  • General adaptation syndrome (GAS)

  1. stages

  • Muscle adaptation depends on type of activity 

  • Repetition maximum

  • Sarcomere 


Factors to optimize adaptation

  • Overload principle 

  • Specificity

  • Individuals principle 


Adaptations in resistance training

  • Muscle growth

  • Protein synthesis

  • Amino acid delivery 



Adaptation in aerobic training

  • Cardiac output

  • Heart rate

  • VO2 max

  • Redistribution of blood

  • Oxygen extraction

  • Respiratory system

  • Lactate threshold


Chapter 3: Cardiovascular System

  • Heart, blood vessels, and blood

  • Heart chambers

  1. Receiving and pumping

  2. Diastole and systole

  • Layers of the blood vessels

  1. tunica intima, tunica media, tunica externa

  2. Vasoconstrictions vs. vasodilation

  3. The role of nitric oxide

Blood

  • Types of circulating lipid vesicles

  1. HDL, LDL, VLDL, chylomicrons

  2. Cholesterol metabolism

  3. Which one is more susceptible to oxidation

  • Stages of atherosclerosis

  • Cholesterol buildup


Medications and surgeries 


Chapter 4: Vitamins


What are vitamins

  • Water insoluble vitamins

  1. A, D, E, and K

  • Water soluble vitamins

  1. Bs and C

- Function

• Deficiency

• Diseases

• Synthesized in the body

• Source of food

• No need to know quantity/dose


We produce vitamin d and k in our bodies 

iClicker Questions


During aerobic exercise

  • The cardiac output increases

  • Delivery of blood to the stomach decreases

  • Delivery of blood to the muscles increases

  • a and c

  • All the choices


Vitamin that plays a role in color vision

  • Vitamin A

I. Introduction to the Cardiovascular System

  • Components: Heart, blood vessels, blood.

  • Function: Circulates blood, delivering oxygen/nutrients to cells, removing CO2/waste.

II. The Heart

  • Description: Muscular organ, continuously contracts to circulate blood.

  • Statistics:

    • Circulates 7,000 liters of blood daily.

    • Approximately 2.5 billion contractions over a lifespan.

    • Adult dimensions: 14 cm length, 9 cm width.

  • Location: Thoracic cavity, slightly to the left, surrounded by lung lobes.

  • Internal Structure:

    • Four hollow chambers: Receive and propel blood.

      • Superior chambers (receiving): Right atrium, Left atrium.

      • Inferior chambers (pumping): Right ventricle, Left ventricle.

    • Septum: Thin muscle wall separating chambers.

      • Separates right and left atria.

      • Separates right and left ventricles.

      • Ensures separation of poorly oxygenated blood (right side) from oxygenated blood (left side).

    • Valves: Connective tissues separating atria and ventricles.

      • Promote unidirectional blood flow (atria to ventricles).

      • Prevent retrograde (backward) flow.

  • Blood Circulation Process in the Heart:

    • Deoxygenated Blood Pathway:

      • Poorly oxygenated blood (low O2, high CO2) enters right atrium via superior vena cava and inferior vena cava.

      • Passes through tricuspid valve into right ventricle.

      • Right ventricle contracts, expelling blood through pulmonary semilunar valve into pulmonary trunk.

      • Pulmonary trunk transports blood to the lungs.

    • Oxygenation in Lungs: Blood acquires oxygen, releases carbon dioxide.

    • Oxygenated Blood Pathway:

      • Oxygenated blood returns to left atrium via pulmonary veins.

      • Passes through bicuspid valve into left ventricle.

      • Left ventricle: Most substantial myocardial wall, strongest contractile force.

      • Left ventricle contracts, propelling blood through aortic semilunar valve into aorta.

      • Aorta: Largest blood vessel, distributes blood to all body cells.

    • Deoxygenation in Body Cells: Blood releases oxygen, receives carbon dioxide.

    • Return to Heart: Deoxygenated blood returns to heart via superior and inferior vena cava, restarting the cycle.

    • Simultaneous Contraction: Right and left atria contract simultaneously, followed by simultaneous contraction of right and left ventricles.

  • Blood Supply to the Heart (Coronary Circulation):

    • Heart muscle requires its own blood supply for oxygen and nutrients, and waste removal.

    • Blood flowing through heart chambers does NOT nourish heart tissue.

    • Coronary Arteries: Originate from the aorta.

      • Right coronary artery: Supplies right side of the heart.

      • Left coronary artery: Supplies left side of the heart.

      • Supply blood during ventricular relaxation.

    • Branches: Coronary arteries branch to supply other heart regions.

      • Anterior interventricular artery (Left Anterior Descending - LAD): A main branch.

    • Anastomoses: Alternative routes for blood transportation between blood vessels. Crucial in Coronary Artery Disease (CAD) when major vessels are obstructed.

  • The Heart Cycle (Cardiac Cycle):

    • Diastole: State of relaxation (chambers fill with blood).

    • Systole: State of contraction (chambers expel blood).

    • Atrial systole: Atria contract, ventricles in ventricular diastole (relaxed).

    • Ventricular systole: Ventricles contract, atria in atrial diastole (relaxed).

    • Heartbeat: Entire sequence of contraction and relaxation.

    • Heart Sounds (Lub-Dub): Caused by valve closure.

      • "Lub": Ventricular contraction, closure of tricuspid and bicuspid valves.

      • "Dub": Ventricular relaxation, closure of aortic and semilunar valves.

    • Auscultation: Listening to heart sounds with a stethoscope.

      • Heart Murmur: Anomalous sound indicating improperly functioning valves (e.g., blood leakage due to inadequate valve closure).

  • Blood Pressure:

    • Definition: Pressure exerted by blood on blood vessel walls.

    • Measurement: Typically refers to pressure in the aorta.

    • Systolic Pressure (Systole): Highest pressure in aorta when ventricles contract to expel blood. (Upper value in reading).

    • Diastolic Pressure (Diastole): Lowest pressure in aorta when ventricles relax to fill with blood. (Lower value in reading).

    • Sphygmomanometer: Medical instrument used to measure blood pressure.

    • Units: Millimeters of mercury (mmHg). Example: 120 mmHg/80 mmHg.

    • Pulse: Fluctuation in blood pressure detectable by palpating arteries (e.g., radial, carotid).

  • Heart Functionality:

    • Cardiac Conduction System: Specialized muscle cells that generate and propagate electrical impulses, ensuring continuous contraction. Regulates heart rate.

    • Heart Rate (HR): Frequency of electrical impulses/beats per minute (BPM).

      • Typical resting HR: 70-100 BPM.

      • Physical activity increases HR.

    • Stroke Volume (SV): Quantity of blood expelled from the heart with each heartbeat.

    • Cardiac Output (CO): Volume of blood pumped by the heart per minute.

      • Formula: Cardiac Output = Heart Rate × Stroke Volume.

III. The Blood Vessels

  • Function: Network of interconnected tubes transporting blood away from and back to the heart.

  • Components: Arteries, arterioles, capillaries, venules, veins.

  • Total Length: Approximately 62,000 miles.

  • Arteries:

    • Supply nutrients to body cells.

    • Three layers of tissue:

      • Tunica Externa (Outermost): Substantial connective tissue layer; protection, flexibility, allows expansion.

      • Tunica Media (Intermediate): Smooth muscle layer; regulates blood vessel size.

        • Vasodilation: Smooth muscles relax, expanding inner opening, increasing blood flow.

        • Vasoconstriction: Smooth muscles contract, decreasing diameter, reducing blood flow.

        • Reacts to local variables and hormones (e.g., epinephrine).

      • Tunica Intima (Innermost): Monolayer of endothelial cells; directly interfaces with blood in the lumen.

        • Endothelial cells: Crucial roles in blood vessel function.

          • Release nitric oxide (powerful vasodilator).

          • Control blood flow, renewal, communication with immune cells.

          • Regulate smooth muscle cells in tunica media.

  • Organ Blood Flow Variability:

    • Fluctuates based on body condition.

    • Decreases to inactive organs, increases to active organs.

    • Organ Perfusion: Continuous, even if minimal (e.g., legs while seated).

    • Regulation: Brain, hormones, locally produced substances.

  • Cardiovascular Illnesses (e.g., Atherosclerosis): Fat deposits in arteries hinder normal constriction/dilation.

IV. The Blood

  • Description: Type of connective tissue.

  • Components: Cells, water, proteins.

  • Function: Transports oxygen, nutrients, hormones; removes metabolic waste.

  • Blood Volume:

    • Males: 5-6 liters.

    • Females: 4-5 liters.

  • Blood Cells:

    • Red Blood Cells (Erythrocytes): Transport oxygen and carbon dioxide.

    • White Blood Cells: Involved in immune response.

    • Platelets: Aid in blood clotting.

  • Plasma: Aqueous and protein components of blood.

    • Contains clotting factors, water, proteins, amino acids, carbohydrates, lipids, vitamins, hormones, electrolytes.

  • Hematocrit (Packed Cell Volume):

    • Technique to evaluate blood component amounts.

    • Process: Blood sample centrifuged, separating components by density.

      • Red blood cells: Sediment at base (substantial amount).

      • White blood cells & Platelets: Middle layer.

      • Plasma: Top, transparent section.

    • Definition: Proportion of red blood cells relative to total blood sample volume.

    • Healthy Levels: Males: 42-47%; Females: slightly lower.

  • Blood Cholesterol:

    • Description: Type of lipid.

    • Sources:

      • Exogenous: Diet.

      • Endogenous: Synthesized in the liver.

    • Essential Nutrient Status: Not essential, as the body can synthesize it.

    • Digestion/Transport:

      • Processed in small intestine by cholesterol esterase.

      • Micelles transfer to enterocytes.

      • Enclosed in chylomicrons (large lipoprotein vesicles).

      • Chylomicrons enter lymphatic system, then blood vessels, transporting cholesterol to the liver for storage.

    • Liver's Role: Central hub for cholesterol accumulation and release.

    • Transport in Bloodstream: Cholesterol is water-insoluble, transported within lipoprotein vesicles.

      • Very Low-Density Lipoprotein (VLDL): Secreted by liver, transports cholesterol and other lipids. Unloads lipids into body cells, converting to LDL.

      • Low-Density Lipoprotein (LDL): Formed from VLDL after lipid unloading. Transported back to liver for recycling.

        • "Bad cholesterol": High cholesterol content, prone to trapping in blood vessels, increasing CVD risk.

      • High-Density Lipoprotein (HDL): Synthesized by liver.

        • "Good cholesterol": Retrieves surplus cholesterol from bloodstream, transports it back to the liver for elimination. Possesses antioxidant capabilities.

    • Optimal Health: Low plasma LDL, high HDL.

    • Lipid Panel: Blood test measuring LDL, HDL, total cholesterol to assess CVD risk.

    • Elevated LDL: Strong association with increased CVD susceptibility, but not the complete picture; other markers are important.

V. Atherosclerosis

  • Definition: Degenerative condition affecting arteries, leading cause of myocardial infarctions (heart attacks) and strokes.

  • Progression: Begins early in life (around age 10), gradually apparent over time.

  • Prevalence: Primary cause of mortality in Westernized societies (~50% of fatalities).

  • Key Contributors: Elevated blood cholesterol, vulnerability of cholesterol to oxidation.

  • Mechanism:

    • Cholesterol (in lipoprotein vesicles) accumulates in blood vessels.

    • Trapped cholesterol undergoes oxidation by reactive oxygen species.

    • Initiates inflammation and attracts immune cells.

    • Blood vessel injury worsens, reducing blood flow.

    • Ischemia: Lack of oxygen to cells in vital organs, leading to cell death.

    • Thrombus (clot) formation: Complete obstruction of blood flow, causing heart attack or stroke.

  • Stages of Atherosclerosis Development:

    • 1. Initiation of a Lesion:

      • Artery Layers: Tunica intima (endothelial cells), tunica media (smooth muscles), tunica externa (connective tissue).

      • Endothelium: Innermost layer, semipermeable barrier, controls blood flow, renewal, immune cell communication.

      • Atherosclerosis often occurs in endothelial cells at arterial branching points.

      • High-calorie diet leads to elevated LDL.

      • LDL penetrates endothelial layer, accumulates in sub-endothelial space (between tunica intima and tunica media).

      • Accumulated LDL oxidizes, initiating inflammation and recruiting immune cells.

      • HDL protects by capturing trapped LDL, but excessive LDL overwhelms HDL, leading to CVDs.

    • 2. Inflammation:

      • Immune cells (macrophages, lymphocytes) recruited to LDL accumulation site.

      • Endothelial cells increase receptor production to promote immune cell migration.

      • No blood flow obstruction at this stage.

    • 3. Formation of Foam Cells:

      • Elevated LDL increases immune cell recruitment.

      • Macrophages penetrate sub-endothelial region.

      • Macrophages engulf trapped LDL via endocytosis.

      • Macrophages enlarge due to excessive lipids, becoming "foamy" and yellowish.

      • Foam cells: Significant manifestation of inflammation, key progression in atherosclerosis.

    • 4. Formation of Fibrous Plaques:

      • Cytokines (from macrophages, leukocytes) stimulate plaque formation.

      • Plaques: Aggregates of lipids merging with migrating smooth muscle cells.

      • Mass expands, pressing on inner blood vessel.

      • Fibers and calcium accumulate around plaque, making it rigid and inflexible.

      • Calcified vessels lose ability to vasodilate/vasoconstrict.

      • Lumen diameter reduction: Obstructs blood flow.

      • Stenosis: Medical term for blood vessel blockage.

        • Example: 60% stenosis means 60% constriction, 40% blood flow.

      • Reduced blood flow leads to oxygen/nutrient deprivation, gradual cell death, and scar tissue formation (ischemia).

  • Clinical Event (Heart Attack/Stroke):

    • Plaques frequently form in coronary arteries.

    • Gradual blood flow reduction may go unnoticed.

    • Significant area of heart deprived of oxygen leads to heart attack.

    • Two main causes of heart attack:

      • Large accumulation of scar tissue/dead cells obstructing blood flow, impairing heart function.

      • Unstable plaque dislodges, travels, and completely blocks a narrower blood vessel.

  • Atherosclerosis Diagnosis:

    • Symptoms: Dyspnea, paresthesia, pain/numbness in left arm/chest.

    • Angiography: Cardiac imaging procedure to evaluate plaque size and stenosis degree.

    • Treatment based on stenosis:

      • Minimal stenosis: Cholesterol-lowering drugs (statins), exercise, restrictive diet.

      • Significant stenosis: Hospitalization, surgical/procedural alternatives.

  • Interventions for Atherosclerosis:

    • Angioplasty:

      • Expands narrowed blood vessel at blockage site.

      • Procedure: Deflated balloon (on a wire) inserted via femoral artery, navigated to constriction.

      • Balloon inflated to dilate vessel, compressing plaque.

      • Stent: Implanted permanently to maintain expansion. May be coated with medications/anticoagulants.

    • Coronary Artery Bypass Graft (CABG):

      • Surgical operation to mitigate coronary artery disorders.

      • Involves extracting arteries/veins from other body parts (e.g., internal thoracic artery, radial artery, saphenous vein).

      • Graft sutured to coronary artery beyond blockade and linked to aorta.

      • Reroutes blood flow around blocked area.

  • Risk Factors of Cardiovascular Diseases (CVDs):

    • Physically inactive lifestyle.

    • Lack of consistent physical activity.

    • Excessive alcohol consumption.

    • Insufficient omega-3 fatty acid intake.

    • Lack of diverse fruits and vegetables.

    • Tobacco consumption.

    • Diet high in trans fat and omega-6 fatty acids.

    • Excessive weight or obesity.

    • Chronic inflammation.

    • Importance: CVDs lead to premature mortality and reduced quality of life; proactive lifestyle choices are crucial.

VI. Important Facts to Memorize

  • Heart circulates 7,000 liters of blood daily.

  • Heart undergoes ~2.5 billion contractions in a lifetime.

  • Adult heart: 14 cm length, 9 cm width.

  • Heart has 4 chambers: Right atrium, Left atrium (receiving); Right ventricle, Left ventricle (pumping).

  • Septum separates heart chambers.

  • Tricuspid valve: Between right atrium and right ventricle.

  • Bicuspid valve: Between left atrium and left ventricle.

  • Pulmonary semilunar valve: Between right ventricle and pulmonary trunk.

  • Aortic semilunar valve: Between left ventricle and aorta.

  • Pulmonary trunk carries deoxygenated blood to lungs.

  • Pulmonary veins carry oxygenated blood to left atrium.

  • Aorta is the largest blood vessel.

  • Coronary circulation supplies blood to the heart muscle.

  • Anterior interventricular artery (LAD) is a main branch of coronary arteries.

  • Anastomoses are alternative blood flow routes.

  • Diastole = relaxation; Systole = contraction.

  • "Lub" sound: Tricuspid and bicuspid valve closure.

  • "Dub" sound: Aortic and semilunar valve closure.

  • Heart murmur indicates faulty valves.

  • Systolic pressure (top number) = ventricular contraction.

  • Diastolic pressure (bottom number) = ventricular relaxation.

  • Sphygmomanometer measures blood pressure.

  • Cardiac Output = Heart Rate × Stroke Volume.

  • Typical resting HR: 70-100 BPM.

  • Blood vessel layers: Tunica externa, Tunica media, Tunica intima.

  • Tunica media contains smooth muscle for vasodilation/vasoconstriction.

  • Endothelial cells release nitric oxide (vasodilator).

  • Average blood volume: Males 5-6 L, Females 4-5 L.

  • Red blood cells transport O2/CO2.

  • White blood cells for immune response.

  • Platelets for clotting.

  • Hematocrit: Proportion of red blood cells in blood volume.

  • Cholesterol sources: Exogenous (diet), Endogenous (liver).

  • VLDL transports lipids from liver to cells.

  • LDL ("bad cholesterol") transports cholesterol to cells, can accumulate in arteries.

  • HDL ("good cholesterol") retrieves excess cholesterol from bloodstream to liver.

  • Atherosclerosis is the leading cause of heart attacks and strokes.

  • Atherosclerosis begins with LDL accumulation and oxidation in the sub-endothelial space.

  • Foam cells are macrophages engorged with lipids.

  • Plaques are lipid aggregates with smooth muscle cells, fibers, and calcium.

  • Stenosis is blood vessel blockage.

  • Angioplasty uses a balloon and stent to open blocked arteries.

  • CABG bypasses blocked arteries with grafts from other vessels.


Introduction to Exercise Physiology

  • Optimal Physical Results: Gained through knowledge of physiological principles underpinning exercise.

  • Customized Exercise Routine: Requires considering muscle strength, power, endurance, and flexibility.

    • Muscle Strength: Magnitude of force generated by muscles.

    • Power: Rate at which a muscle can generate force.

    • Endurance: Ability of a muscle to sustain force production over time.

    • Flexibility: Capacity to articulate a joint in a fluid manner.

    • Note: These elements are interconnected but may require distinct training methods.

  • Why Exercise?

    • Analogy: Nothing is given without compensation (credit card bill). Inactivity leads to "invoice" of lifestyle disorders.

    • Benefits of Physical Activity:

      • Enhances cardiovascular system efficiency (effective heartbeats).

      • Improves respiratory system (better oxygen absorption).

      • Boosts digestive system functioning.

      • Enhances metabolism (burns surplus fat, prevents storage).

      • Postpones aging process and prevents muscular atrophy (especially when started young).

      • Enhances immune system efficacy.

      • Mitigates risk of specific cancers.

      • Enhances bone density, diminishing osteoporosis risk.

Skeletal Muscle Adaptation & Stress Response

  • Skeletal Muscle Tissues: Remarkable capacity to adapt to physical activity.

  • Exercise as Stress: Body systems respond to exercise like any other stress.

    • Recurring exposure to identical stresses leads to adaptation.

    • Optimal Stress Level: Crucial for adaptation; insufficient stress yields no adaptation, excessive stress causes damage.

  • General Adaptation Syndrome (GAS): Body's physiological changes in response to exercise stress.

    • Three Stages:

      • Alarm Stage: Body attempts to adapt to ongoing changes (e.g., increased oxygen supply to muscles via enhanced cardiac output, circulation, gas exchange). Primes body for future stressors.

      • Resistance Development Stage: Body prepares for upcoming stress by building reserves.

        • Increases storage capacity of energy-dense molecules.

        • Improves blood supply to muscles (oxygen/nutrient delivery).

        • Increases mitochondria in muscle cells (more energy-dense molecules).

      • Exhaustion Stage: Manifests during overtraining, leading to injuries (fractures, sprains, strains).

        • Prevention: Exercise with caution, avoid overtraining.

        • Periodization: Technique to prevent exhaustion (systematic division of training into distinct periods, transitioning from low-intensity/long-duration to high-intensity/short-duration, then decreasing intensity before new performance level).

Muscle Adaptation Determinants

  • Skeletal Muscle Capacity: Remarkable capacity for adaptation.

  • Stress & Load: Significant modifications in response to stress against a load, improving performance/functionality.

    • Hypertrophy: Increase in muscle size due to regular exercise (e.g., weight training).

    • Atrophy: Decrease in muscle size due to less use (e.g., astronaut, cast).

  • Gradual Intensity Increase: Greatly enhances adaptation over time.

  • Specific Adaptations: Differ based on workout nature.

    • Weightlifting/Anaerobic: Enhances muscle strength and power.

    • Cardiac Aerobic: Enhances endurance.

  • Beyond Muscles: Adaptation includes circulatory and respiratory systems.

  • Objective of Exercising: Provide sufficient stress for lasting alterations, enhanced performance, and increased load capacity.

  • Key Principles for Optimal Adaptation:

    • Overload Principle: Muscles must be worked to utmost capacity to adapt and develop strength/power.

      • Repetition Maximum (RM): Utmost weight lifted in a single exercise.

      • Training Recommendation: Engage muscle at 70-80% RM for 4-8 repetitions.

      • Mechanism: Hypertrophy (increased protein synthesis, greater amino acid supply).

      • Intensity & Duration: Higher intensity/longer duration increases protein synthesis.

      • Physiological Changes: Enhances force production and contraction velocity. Shifts Type IIx to Type IIa muscle fibers. Increases rapid myosin heavy chain creation.

    • Exercise Specificity: Muscular adaptation is exclusive to the muscle being worked (e.g., biceps curls adapt biceps, not legs).

      • Muscle Fiber Activation:

        • Low-intensity: Engages slow-oxidative (Type I) motor units (fatigue-resistant).

        • High-intensity: Engages fast-twitch motor units (tire faster).

      • Power Enhancement: Contingent on specific exercise type, even for same primary muscle groups (e.g., squats vs. leg presses).

    • Individual Principle: Exercise outcomes vary among individuals due to differences in muscle composition (Type I vs. Type II fibers), determined by heredity.

      • Endurance Athletes: More slow-twitch fibers.

      • Strength Athletes: More fast-twitch fibers.

      • Training Impact: Enhances transformation of Type IIx to Type IIa fibers.

Delayed-Onset Muscle Soreness (DOMS)

  • Occurrence: Regular occurrence after excessive resistance exercise, typically 24-48 hours post-activity.

  • Causes: Accumulation of lactic acid, damage to fascia connective tissue, muscle tissue damage, muscle spasms.

  • Mechanism: Excessive strain leads to tissue damage (especially eccentric contractions at sarcomere Z-lines).

  • Inflammatory Response: Muscle injury attracts immune cells (macrophages, leukocytes) for repair.

    • Increased blood circulation, tissue permeability.

    • Secretion of histamine, serotonin, prostaglandin.

    • Results in edema (fluid outside muscles).

    • Immune cells and chemicals intensify pain receptors, increasing pain susceptibility.

  • Nature: Temporary, not chronic.

  • Adaptation: After inflammation and healing, muscle is better equipped for larger loads, reducing future DOMS impact.

  • Prevention/Management: Optimal rest periods during and between training sessions. Inadequate rest diminishes performance due to insufficient tissue repair.

Effects of Resistance Training

  • Muscle Engagement: Brief intervals, substantial load. Intensity depends on load.

  • Adaptation Mechanism:

    • Cross-bridges: Tension from actin-myosin cross-bridges. Heavier loads increase cross-bridges.

    • Training Effect: Regular training increases available cross-bridges (e.g., 500,000 to 600,000+ for 50lb bench press), making weight feel lighter.

    • Origin of New Cross-bridges: Neural network and musculature. Nervous system activates more motor units, increasing actin and myosin production.

    • Speed of Change: Influenced by genetics and training level.

Nervous System Physiological Adaptations

  • Neural Connections: Voluntary control of skeletal muscles.

  • Motor Unit: Single neuron and all muscle cells it controls.

    • Variation: Size (10 to 1000 muscle cells) and type.

    • Fiber Type Specificity: Solitary neuron connects to motor unit with a single type of muscle fiber (slow motor units activate slow oxidative, fast motor units activate fast fiber types).

    • Resistance Training: Primarily relies on activation of rapid motor units.

  • Progressive Training Response:

    • Recruitment: Nervous system recruits additional motor units with repeated exposure to severe load. Enhances coordination, simplifies movement.

    • Force Production: More muscle cells activated = higher force due to increased actin-myosin cross-bridges.

    • Motor Unit Activation Frequency: Nervous system enhances firing frequency of fast motor units, capable of managing substantial loads, and sustains activation longer.

    • Force Increase: Greater strength and firing rate in larger motor units. Force production increases at least fourfold with dramatic firing rate increase.

  • Coordination: Facilitates muscular adaptation and enhances coordination among antagonistic muscles.

  • Cross-training Effects: Training one limb impacts coordination of the other. Leads to enhanced coordination and strength, but improvements are smaller in the untrained limb.

Muscular Physiological Adaptations

  • Hypertrophy: Augmentation of muscle size due to increased protein synthesis.

    • Myofibrils: Muscle proteins arrange into long, thread-like structures. Progressive resistance training increases myofibril quantity within muscle cells.

    • Strength Correlation: Increased myofibrils correlate with increased strength.

    • Fiber Type: More frequent in fast-twitch fibers than slow-twitch.

    • Protein Composition: Alters protein composition, increasing myosin heavy-chain IIa isoforms, which augment force generation.

  • Hyperplasia: Increase in the number of muscle cells (debated).

  • Energy Consumption: Muscles consume significant energy during activity. Increased training requires increased energy expenditure.

  • Storage Capacity: Aerobic resistance training increases glycogen and triglyceride storage capacity in muscles. Greater storage allows increased energy utilization and enhanced force production.

Aerobic Training Physiological Changes

  • Motor Unit Engagement: Engages slow-twitch motor units, requiring prolonged activation. Multiple iterations engage slow-twitch fibers for sustained, low-intensity force.

  • Adaptation Principles: Overload principle and General Adaptation Syndrome remain relevant. Greater effort on muscles leads to greater functional capability.

  • Distinct Adaptation: Aerobic exercise targets different muscle groups than weight training, leading to different adaptation processes.

  • Peak Performance: Requires progressive strain intensification and adequate rest for recovery.

  • Metabolic Alterations: Encompasses circulatory, respiratory, and musculoskeletal systems to meet energy requirements.

  • Oxygen Supply: Sufficient oxygen supply and transportation to exercised muscle are essential.

  • VO2max: Primary physiological change from aerobic exercise, highly dependable measure of cardiovascular fitness.

    • Definition: Maximum amount of oxygen an individual can utilize during intense exercise. Indicator of aerobic fitness/cardiovascular endurance.

    • Oxygen Pathway: Inhale oxygen (lungs) -> deliver to cells (circulatory system) -> oxygen uptake in cells for ATP production.

    • ATP Production: Cells use oxygen to transform caloric energy (lipids, carbohydrates) into ATP.

      • Anaerobic: 2 ATP per glucose (without oxygen).

      • Aerobic: 30 ATP per glucose (with oxygen). Oxygen increases ATP production by 15x.

    • Exercise & ATP: Increased ATP need during exercise. Greater oxygenation leads to increased ATP synthesis.

    • Linear Increase: Oxygen uptake increases linearly with power output until VO2max.

    • Threshold: Oxygen intake reaches a threshold, cannot increase further, limiting ATP generation.

    • Physiological Limit: VO2max represents the upper limit of physiological capacity.

    • Limiting Factors: Limited capacity of circulatory system (blood transport) and lungs (oxygen supply).

    • Training Effect: Exercise training prolongs duration to reach VO2max. Untrained individuals reach it rapidly; trained individuals take much longer.

The Circulatory System

  • Role: Circulates blood, delivers oxygen, nutrients, hormones; removes waste products; regulates body temperature.

  • Oxygen Supply Enhancement During Activity:

    • Increased Metabolic Processes: Muscles have increased metabolic demand, requiring more oxygen/nutrients for ATP.

    • Increased Blood Flow: Heart increases cardiac output and enhances perfusion to working muscles.

    • Blood Redistribution: Reallocates blood supply from inactive organs to vital ones.

  • Cardiac Output (CO): Volume of blood expelled by heart in one minute.

    • Mechanism: Heart contracts (systole) to propel blood, relaxes (diastole) to fill.

    • Relationship with Oxygen Intake: Clear, linear relationship.

    • Formula: CO = Heart Rate (HR) x Stroke Volume (SV).

      • HR: Number of beats per minute.

      • SV: Amount of blood ejected per beat.

    • Exercise Effect: CO increases to meet oxygen demands.

      • Resting CO: ~5 L/min (average).

      • Untrained CO (exercise): ~22 L/min.

      • Trained CO (exercise): ~34 L/min.

    • Untrained Increase: Primarily due to surge in HR.

    • Trained Increase: Due to elevation in both HR and SV.

    • Cardiac Efficiency: Exercise enhances myocardial contractility.

  • Heart Rate (HR): Frequency of cardiac contractions per minute.

    • Resting HR (HRrest): Lower in trained individuals.

    • Maximal HR (HRmax): Peak heartbeats per minute during intense exercise. Declines with age.

      • Estimation: (220 - age). (e.g., 20-year-old: 200 bpm). Approximation only.

      • Trained vs. Untrained: Same HRmax for same age, but trained individuals take longer to reach it.

  • Oxygen Transport in Blood:

    • Forms: 1) In plasma, 2) Attached to hemoglobin in red blood cells.

    • Arteries: Deliver oxygenated blood to tissues.

    • Veins: Carry deoxygenated blood and metabolic waste from tissues back to heart.

    • Oxygen Extraction: Tissues don't receive all arterial blood oxygen at rest. During activity, oxygen need rises, increasing extraction from arteries. More oxygen reaches muscles, enhancing ATP production.

  • Blood Supply Redistribution:

    • Fluctuation: Blood supply to organs is not consistent, depends on body needs.

    • Digestion: Increased blood to stomach/small intestine, consistent HR. Achieved by redirecting blood from non-relevant organs.

    • Exercise: Muscles require much greater blood flow for oxygen/nutrients.

      • Cardiac Output Increase: At least four times normal.

      • Mechanism: Diminishing blood circulation to non-essential organs.

        • Kidney: Rest: 15-20% total blood; Activity: ~3%.

        • Muscles: Rest: ~15% total blood; Activity: ~80%.

The Respiratory System

  • Function: Increase oxygen supply to muscles during activity, absorb oxygen from surroundings.

  • Forms of Breathing:

    • Pulmonary Respiration: Taking oxygen from environment into lungs.

    • Cellular Respiration: Cells use oxygen to produce ATP.

    • Interconnected.

  • Gas Exchange (Ventilation): Lungs facilitate exchange of gases (oxygen in, carbon dioxide out).

  • Exercise Effect: Consistent and rapid increase in lung ventilation (linear and exponential).

    • Trained Individuals: Quicker increase in gas exchange to VO2max.

    • Control: Respiratory centers in medulla oblongata enhance signals to skeletal respiratory muscles.

    • Environmental Impact: Ventilation rate increases more in hot environments than cold.

Lactate Threshold

  • Definition: Exercise intensity where lactate production exceeds lactate clearance in the body.

  • ATP Production: Cellular functions require ATP for muscle contraction.

    • Glycolysis: Generates ATP by oxidizing sugar molecules.

    • Pyruvate: Final outcome of glycolysis in presence of oxygen.

      • Aerobic: Pyruvate transported to mitochondria, generates ~30 ATP per glucose.

  • Oxygen Demand vs. Supply: During exertion, oxygen demand rises. Cardiovascular/pulmonary limitations prevent supply from meeting demand.

  • Anaerobic Respiration: When mitochondria cease functioning, muscle cells switch to producing ATP without oxygen.

    • Pyruvate Conversion: Pyruvate from glycolysis cannot enter mitochondria; converted to lactate.

    • Lactate Production: Directly correlated with intensity and duration of physical activity. Anaerobic exercise elevates lactate.

  • Indicator of Fatigue: Gradual rise in blood lactate indicates dependence on anaerobic respiration. Abrupt buildup signifies fatigue due to limited ATP production via glycolysis.

  • Lactate Fate: Not discarded. Liver metabolizes lactate into pyruvate after activity. Liver transforms pyruvate back into glucose.

    • Glucose Use: Muscle uses glucose for ATP production or stores it as glycogen.

Important Facts to Memorize

  • Muscle Strength: Magnitude of force.

  • Power: Rate of force generation.

  • Endurance: Sustain force over time.

  • Flexibility: Joint articulation capacity.

  • General Adaptation Syndrome (GAS) Stages: Alarm, Resistance Development, Exhaustion.

  • Overload Principle: Work muscles to utmost capacity for adaptation.

  • Repetition Maximum (RM): Max weight for one lift.

  • Training Zone for Hypertrophy: 70-80% RM, 4-8 repetitions.

  • Hypertrophy: Increase in muscle size (protein synthesis, myofibrils).

  • Atrophy: Decrease in muscle size.

  • DOMS Onset: 24-48 hours post-intense activity.

  • DOMS Causes: Lactic acid, fascia damage, muscle tissue damage, spasms.

  • Eccentric Contractions: Primarily cause muscle injury at Z-lines.

  • Motor Unit: Single neuron + all muscle cells it controls.

  • Resistance Training: Primarily activates rapid motor units.

  • Cardiac Output (CO): HR x SV.

  • Resting CO (average): ~5 L/min.

  • Trained CO (exercise): ~34 L/min.

  • Untrained CO (exercise): ~22 L/min.

  • HRmax Estimation: 220 - age.

  • Trained vs. Untrained HRmax: Same for same age, but trained take longer to reach.

  • Blood Redistribution (Kidney): Rest: 15-20%; Activity: ~3%.

  • Blood Redistribution (Muscles): Rest: ~15%; Activity: ~80%.

  • VO2max: Max oxygen utilization during intense exercise.

  • ATP Production (Anaerobic): 2 ATP per glucose.

  • ATP Production (Aerobic): 30 ATP per glucose.

  • Lactate Threshold: Lactate production exceeds clearance.

  • Lactate Fate: Liver metabolizes to pyruvate, then to glucose.



How to Become a Centenarian: A Comprehensive Study Guide

I. Introduction to Longevity and Health

  • Medical Research Focus: Longevity and quality of life are paramount in current medical research.

  • Centenarian Goal: Achieving a lifespan of 100 years is possible by adhering to specific principles.

  • "Input Equals Output" Principle: This fundamental concept applies directly to physical well-being.

    • Literal Interpretation: Consuming spoiled food (e.g., E. coli contaminated spinach) leads to immediate negative consequences (e.g., food poisoning, vomiting).

    • Nutrient Intake: Proper nutrient intake leads to optimal bodily function; inadequate intake impairs it.

II. Historical Context of Disease and Life Expectancy

  • Pre-1900s:

    • Prevailing Causes of Death: Acute infectious infections.

    • External Influences: Unhygienic conditions, inadequate sewage disposal, contaminated water/agriculture, substandard diet, insufficient food preservation, overcrowded living conditions.

    • Rudimentary Healthcare: Inadequate medical care, rapid disease proliferation.

    • Example: Yellow fever claimed 16,500 lives (1853-1858).

    • Life Expectancy: Limited to approximately 30 years.

  • Early 1900s Advancements:

    • Solutions: Effective water filtration techniques, proper waste management.

    • Result: Significant extension of life expectancy.

  • Shift in Medical Focus:

    • From External to Internal: After addressing external concerns, focus shifted to internal disorders (problems originating within the body).

    • Medical Breakthroughs: Development of efficient medical processes, accurate outcomes.

    • Key Discoveries: Antibiotics, insulin, vitamin B12.

      • Antibiotics: Treated highly infectious diseases (pneumonia, influenza, tuberculosis).

      • Insulin: Transformed diabetes from lethal to manageable.

      • Vitamin B12: Mitigated adverse effects of anemia.

    • Outcome: Mastery of acute infectious diseases within 50 years.

III. The Rise of Chronic Diseases

  • New Leading Cause of Death: Chronic diseases emerged as the primary cause of death after acute infectious diseases were largely controlled.

  • "Input Equals Output" Revisited: Despite safer food, unrestricted eating habits are detrimental.

  • Distinguishing Factor: Lifestyle-related risk factors differentiate acute infectious illnesses from chronic diseases.

  • Lifestyle Shift:

    • Past: Physically strenuous lifestyle (despite unhygienic conditions, poor healthcare).

    • Present: Sedentary lifestyle due to improved living standards and healthcare.

    • Statistics: Small fraction of US population meets minimum physical guidelines; ~40% meet obesity criteria.

  • Leading Chronic Diseases:

    • Cardiovascular Diseases (CVDs): Primary cause of death in 90% of countries (past 2-3 decades); ~20% of all deaths; leading chronic disease of 21st century.

    • Cancer: Second most prevalent.

  • Acute vs. Chronic Diseases:

    • Acute: Rapid transmission, prompt onset, external factors.

    • Chronic: Gradual progression, extended duration, prolonged unhealthy lifestyle choices (internal factors).

  • Childhood Implications: Elevated rates of juvenile obesity and physical inactivity lead to increased diabetes and hypertension in children, predicting higher future morbidity (primarily CVDs).

  • Genetics and Obesity:

    • Research: Scientists studied genetics due to rising obesity rates.

    • Findings: Heredity accounts for only 5% of US obesity cases; 95% attributed to long-term bad lifestyle choices.

    • Counteracting Predisposition: Nutritious diet and regular physical activity can counteract hereditary predispositions to overweight.

IV. Key Lifestyle Risk Factors and Their Impact

  • Core Principle: Quality of consumption directly affects bodily function. Unhealthy diet and lack of physical activity lead to irregular, inefficient functioning.

  • Specific Risk Factors:

    • Tobacco Consumption:

      • Most Avoidable: Personal choice.

      • Mortality (2000): 360,000 deaths (exceeded stroke deaths: 200,000).

      • Global Impact: 1.3 billion individuals (middle/low-income) consume tobacco.

      • Health Effects: Established link to lung/oral cancer; new research on heart/circulatory system damage.

      • Mechanism: Carcinogens cause plaque accumulation in blood vessels, obstructing blood flow.

      • Outcomes: Atherosclerosis (hardening/rupture of blood vessels), hypertension (elevated blood pressure).

    • High-Calorie Diet:

      • Characteristics: Significant intake of harmful fats (especially trans fats).

      • Susceptibility: Elevated risk of CVDs.

      • Mechanism: Elevated plasma cholesterol leads to plaque formation, impaired blood circulation, atherosclerosis.

      • Global Impact: Overconsumption of calories responsible for ~56% of heart attacks, 18% of strokes.

    • Inadequate Physical Activity (Low Calorie Expenditure):

      • Modern Society: Technology (post-Industrial Revolution) reduces physically demanding tasks (e.g., elevators, remote controls, washing machines, escalators).

      • BMI Connection: Established link between BMI and insufficient physical exercise.

      • Cuba Study (1989):

        • Context: Loss of Soviet Union as trading partner, economic collapse.

        • Lifestyle Change: Declined food consumption, gasoline scarcity (increased walking/biking).

        • Results: Significant rise in physical activity (30% to 67%); 1.5-unit shift in BMI.

        • Mortality Rate Decreases: Diabetes (-51%), CVD (-35%), stroke (-20%).

        • Conclusion: Physically strenuous life preserved lives.

V. Obesity: The Next Pandemic

  • Global Impact: Affects individuals globally, particularly in the US.

  • US Obesity Rate: Exceeds 40%.

  • Cause: Gradual accumulation of multiple factors over a prolonged period.

  • Contributing Factors: High caloric/refined sugar intake, sedentary lifestyles.

  • Demographics: Affects all ages, genders, socioeconomic backgrounds, and income levels.

  • Prevention: Adopting a healthy lifestyle immediately is the only way to avoid it.

  • Progression: Failure to prevent obesity leads to overweight, then obesity, then diabetes or hypertension.

  • Diabetes:

    • Global Impact: Over 180 million people affected.

    • Type 2 Diabetes (Most Prevalent): Diminished insulin sensitivity.

    • Consequences (Hyperglycemia/Elevated Blood Sugar): Atherosclerosis, retinopathy (vision loss), neuropathy (nerve damage), nephropathy (kidney dysfunction), stroke.

  • Hypertension (High Blood Pressure):

    • Definition: Systolic pressure > 140 mmHg (normal: 120/80 mmHg).

    • Vulnerability: Increased risk of future CVDs.

    • Global Impact: Responsible for ~62% of strokes, 49% of coronary heart disease.

VI. Maintaining a Healthy Body and Centenarian Principles

  • Fat Cells: Individuals can decrease fat cells but not fully eradicate them.

  • Prevention vs. Restoration: Maintaining a healthy body shape is easier than restoring or establishing one.

  • Modern Dietary Challenges: Oversized servings, processed foods, sugary beverages lead to excess calorie consumption.

  • Individualized Approach:

    • General Suggestions: Broad, not specific to individuals.

    • Unique Needs: Each person has unique physique, activity levels, dietary limitations; calorie consumption varies.

    • Personalized Criteria: Focus on nutrition and activity for centenarian status.

  • Impact of Food Quality: Refined sugar and trans fat consumption negatively impacts body efficiency.

  • Centenarian Studies (Japan):

    • Findings: Individuals aging without medication showed reduced age-related deterioration, postponed/avoided chronic illnesses (Alzheimer's, CVDs, cancer).

    • Lifestyle: Physically demanding daily activities (no cars/elevators), primarily unprocessed food diets.

    • Contrast: Developed countries have predominantly refined/processed diets.

  • Centenarian Studies (Pain/Discomfort):

    • Findings: Centenarians reported less pain/discomfort than younger, less physically capable counterparts.

    • Mindset: Adapted lifestyles, positive outlook.

  • Key Determinants of a Prolonged, Excellent Life:

    • Active Engagement: Individuals actively engage in activities.

    • High Physical Activity: Maintain high levels.

    • Intellectual Activities: Participate in them.

    • Societal Impact: Have a notable impact on society.

  • Physical Activity Benefit: Regular physical activity can decrease or eliminate the likelihood of acquiring CVDs.

Important Facts to Memorize

  • "Input Equals Output" Principle: Fundamental to physical well-being.

  • Pre-1900s Life Expectancy: ~30 years.

  • Early 1900s Breakthroughs: Water filtration, waste management, antibiotics, insulin, vitamin B12.

  • Shift in Disease: Acute infectious diseases (pre-1900s) to Chronic diseases (post-1900s).

  • Leading Chronic Disease: Cardiovascular Diseases (CVDs).

  • US Obesity Rate: Exceeds 40%.

  • Genetics vs. Lifestyle (Obesity): 5% heredity, 95% lifestyle.

  • Tobacco Mortality (2000): 360,000 deaths.

  • Global Calorie Overconsumption Impact: ~56% heart attacks, 18% strokes.

  • Cuba Study Outcomes: Physical activity increase (30% to 67%), BMI shift (1.5 units), diabetes mortality (-51%), CVD mortality (-35%), stroke mortality (-20%).

  • Global Diabetes Cases: Over 180 million.

  • Hypertension Definition: Systolic pressure > 140 mmHg.

  • Hypertension Global Impact: ~62% strokes, 49% coronary heart disease.

  • Centenarian Lifestyle: Physically demanding, unprocessed diets, positive outlook, active engagement, intellectual activity, societal impact.


Introduction to Vitamins

  • Definition: Organic molecules crucial for chemical reactions, devoid of energy-yielding properties.

  • Necessity: Body cannot synthesize most vitamins, requiring dietary intake.

    • Exceptions: Limited synthesis of Vitamin D (sunlight on skin) and Vitamin K (large intestine bacteria).

  • Sufficiency: Most individuals get enough from a varied diet.

  • Deficiency: Insufficient intake leads to complex medical conditions.

  • Classification: 13 distinct vitamins, categorized as hydrophilic (water-soluble) or hydrophobic (fat-soluble).

Hydrophobic (Fat-Soluble) Vitamins

  • Characteristics: Vitamins A, D, E, K.

    • Lipid-soluble, allowing body storage (primarily in adipose tissue).

    • No need for daily intake.

    • Metabolized in the digestive system like lipids.

    • Form aggregates within micelles in the small intestine.

    • Transported in the bloodstream as chylomicrons.

    • Risk: Overingestion (megadosing) can lead to toxicity.

Vitamin A (Retinol, Retinal, Retinoic Acid)

  • Functions:

    • Crucial for photoreceptor proteins in eye cells (detecting and adapting to light, color vision).

    • Plays a role in male and female reproductive processes.

    • Enhances skeletal system strength.

  • Sources: Meat, chicken, egg yolk, cow milk, carrots, mango, spinach, pumpkin.

  • Toxicity (Excessive Use):

    • Joint discomfort.

    • Neurological system harm (impaired vision).

    • Skin diseases.

  • Deficiency:

    • Nyctalopia (night blindness).

    • Compromised immune system.

    • Adverse impact on reproductive functions.

  • RDA: Males: 900 micrograms; Females: 700 micrograms.

Vitamin D (Cholecalciferol)

  • Functions:

    • Assimilates calcium, vital for heart, neurological system, and muscle function.

    • Essential for electric signal transmission.

    • Enhances bone density and strength.

  • Sources: Cow milk, dairy products, orange juice, yogurt (fortified).

  • Deficiency:

    • Rickets (children).

    • Osteomalacia (adults).

    • Osteoporosis (weakened bones due to insufficient bone production).

  • Toxicity (Megadosing): Hypercalcemia.

Vitamin E (Tocopherol)

  • Functions:

    • Potent antioxidant: mitigates harm from reactive oxygen species (ROS) by reducing oxidative stress.

    • Stabilizes oxygen by acting as an electron donor, reducing damage to fatty acids and proteins.

    • Maintains a healthy immune system.

    • Reduces cardiovascular illness likelihood.

    • Facilitates Vitamin A absorption.

  • Sources: Sunflower seeds, almonds, egg yolks, fortified foods.

  • Deficiency: Anemia, compromised immunological systems.

  • Toxicity: Rare.

  • RDA: Males: 15 mg; Females: 15 mg.

Vitamin K

  • Functions:

    • Necessary for metabolic chemical events in bones.

    • Coenzyme for blood coagulation (forms mesh-like clot to reduce hemorrhaging).

  • Sources: Endogenously synthesized by intestinal flora, leafy green foods (spinach, Brussels sprouts).

  • Toxicity: No recognized harmful effects.

  • Deficiency: Adverse effects on cardiovascular system, poor blood coagulation.

  • RDA: Males: 120 micrograms; Females: 90 micrograms.

Hydrophilic (Water-Soluble) Vitamins

  • Characteristics: Vitamin B complex (Thiamin, Riboflavin, Niacin, B6, Folate, Pantothenic acid, Biotin, B12) and Vitamin C.

    • High absorption rate, easily move through circulatory system.

    • Not stored in the body (except B12).

    • Excess excreted through urine.

    • Rarely lead to toxicity.

  • Sources: Whole grains, meat, fruits, vegetables, dairy products.

Vitamin C (Ascorbic Acid, Dehydroascorbic Acid)

  • Functions:

    • Prevents scurvy (bleeding tissue).

    • Increases collagen production (structural protein for cell rigidity, blood vessel strength, healing).

    • Helper for bile synthesis, neurotransmitter production, DNA replication, cellular transport protein synthesis.

    • Influences thyroxine production.

    • Crucial for preventing cardiovascular diseases (antioxidant, reduces LDL oxidation, shields white blood cells).

    • Counteracts certain carcinogens.

    • Aids iron absorption.

  • Absorption: Easily absorbed, but drastically decreases with large quantities; excess excreted by kidneys.

  • Sources: Citrus fruits, strawberries, tomatoes, broccoli. Heat (boiling) reduces availability.

  • Cold: Does not prevent common cold, but reduces duration and severity of symptoms.

  • Toxicity (Megadosing >200 mg/day): Harmful effects.

Vitamin B1 (Thiamin)

  • Functions:

    • form Thiamin Pyrophosphate (TPP)

    • TPP functions in pyruvate oxidation and the citric acid cycle

    • amino acids to generate acetyl-CoA.

  • Sources: Sunflower seeds, soy products, beans, whole grains.

Vitamin B2 (Riboflavin)

  • Functions:

    • ATP production (FADH2)

    • transports electrons to the electron transport chain (ATP production).

    • Flavin Mononucleotide (FMN) plays a vital role in protein reduction and aids lipid metabolism.

    • Antioxidant: mitigates oxidative stress.

  • Sources: Eggs, bread and grain products, milk.

  • RDA: Males: 1.3 mg; Females: 1.1 mg.

Vitamin B3 (Niacin, Nicotinic Acid, Nicotinamide)

  • Functions:

    • Plays a role in lipid and carbohydrate metabolism.

    • Forms (NADH) and (NADP).

      • NADH: Essential coenzyme for ATP generation in glucose and fatty acid metabolism.

      • NADP: Works during fatty acid oxidation and ketone body generation.

  • Synthesis: Small quantities synthesized from amino acids, but dietary intake is necessary.

  • Sources: Meat, fish, poultry, fortified bread products.

  • Deficiency: Pellagra (skin, digestive, nervous system disorders).

Vitamin B6

  • Functions:

    • amino acid metabolism

    • transamination

  • Sources: Meat, fish, bananas.

  • Deficiency: Linked to cardiovascular diseases and ineffective protein metabolism

Vitamin B9 (Folate, Folic Acid)

  • Functions:

    • Crucial for DNA synthesis during cell division.

    • Essential for growth and development.

    • homocysteine (high levels linked to cardiovascular disease).

  • Absorption: More efficient as a supplement than natural form.

  • Sources: Green leafy vegetables.

  • Deficiency (Pregnant Women): Neurological abnormalities in newborns.

Vitamin B5 (Pantothenic Acid)

  • Functions:

    • fatty acid oxidation

  • Sources: Meat, egg yolks, potatoes, tomatoes, whole grains.

Vitamin B7 (Biotin)

  • Functions:

    • fatty acid oxidation, similar to B5

  • Sources: Nuts, eggs.

Vitamin B12

  • Functions:

    • Vital for cardiovascular and circulatory functions (synthesis of red blood cells for oxygen delivery and ATP production).

    • Critical for nervous system: aids myelin formation (lipid sheath for rapid electrical signal transmission).

    • protection against stomach acid

  • Digestion & Absorption: Complex process.

    • In meat, proteins protect B12.

    • Stomach: Hydrochloric acid releases B12 from proteins.

    • Freed B12 binds to intrinsic factors (released by stomach).

    • Intrinsic factors transport B12 to small intestine for absorption.

    • Stored in the liver after absorption.

  • Sources: Meat, eggs, milk.

  • Deficiency:

    • Lack of intrinsic factors leads to anemia.

    • Symptoms similar to folate deficiency (e.g., homocysteine buildup).

  • RDA: Males: 2.4 micrograms; Females: 2.4 micrograms.

  • Vegan Diet: Requires fortified foods or supplements.

Important Facts to Memorize

  • Vitamins are organic molecules, no energy-yielding properties.

  • Body cannot synthesize most vitamins; must be obtained through diet.

  • Vitamin D synthesis: sunlight on skin.

  • Vitamin K synthesis: large intestine bacteria.

  • Hydrophobic Vitamins (A, D, E, K): Fat-soluble, stored in body (adipose tissue), no daily need, risk of toxicity with megadosing.

  • Hydrophilic Vitamins (B complex, C): Water-soluble, not stored (except B12), excess excreted, rarely toxic.

  • Vitamin A: Retinol, retinal, retinoic acid. Eye health (photoreceptors, color vision), reproduction, skeletal strength. Deficiency: Nyctalopia. Toxicity: Joint pain, neurological harm, skin issues.

  • Vitamin D: Cholecalciferol. Calcium assimilation, bone density. Deficiency: Rickets, osteomalacia, osteoporosis. Toxicity: Hypercalcemia.

  • Vitamin E: Tocopherol. Potent antioxidant, immune system, cardiovascular health, aids Vitamin A absorption. Deficiency: Anemia, compromised immunity.

  • Vitamin K: Coagulation (blood clotting), bone metabolism. Deficiency: Poor blood coagulation.

  • Vitamin C: Ascorbic acid. Prevents scurvy, collagen synthesis, antioxidant, aids iron absorption. Does not prevent common cold, but reduces severity/duration.

  • Vitamin B1 (Thiamin): Forms TPP, crucial for ATP production (pyruvate oxidation, citric acid cycle).

  • Vitamin B2 (Riboflavin): Coenzyme (FAD, FMN) in carbohydrate breakdown, ATP production, antioxidant.

  • Vitamin B3 (Niacin): Forms NADH and NADP, lipid/carbohydrate metabolism, ATP generation. Deficiency: Pellagra.

  • Vitamin B6: Coenzyme for amino acid metabolism (transamination).

  • Vitamin B9 (Folate): DNA synthesis, cell division, growth, prevents homocysteine buildup. Deficiency in pregnant women: neurological abnormalities in newborns.

  • Vitamin B5 (Pantothenic Acid): Converts to coenzymes for fatty acid synthesis/oxidation, forms Coenzyme A for ATP production.

  • Vitamin B7 (Biotin): Citric acid cycle, fatty acid/carbohydrate breakdown for ATP.

  • Vitamin B12: Red blood cell synthesis, myelin formation (nervous system). Requires intrinsic factors for absorption. Deficiency: Anemia, homocysteine buildup. Vegans need supplements.

  • Megadosing: Overconsumption, especially dangerous for fat-soluble vitamins.