Basics of Kinesiology and Exercise Science

Basics of Kinesiology- Exercise Science

Kinesiology Basics

  • Definition: Kinesiology is the study of human movement, encompassing all types of movement, including:
    • Physical Activity: Any bodily movement produced by skeletal muscle contraction that results in an increase in energy expenditure.
    • Exercise: A specific type of physical activity that is planned, structured, repetitive, and purposeful, primarily aimed at improving physical fitness.
    • Sport: Involves competitive physical activities governed by formal or informal rules, often requiring the application of multiple social sciences.

Human Movement Defined

  • Physical Activity Subcategories:
    • Physical Activity: Any bodily movement that increases energy expenditure.
    • Exercise:
    • Planned
    • Structured
    • Repetitive
    • Purposeful to improve fitness.
    • Sport: Application of various social sciences in competitive contexts.

Dynamic Fields of Human Movement

  • Involves various aspects, including:
    • Play: Engaged for fun, not constrained by rules.
    • Games: Rule-governed contests and playful activities.
    • Leisure: Time free from work and responsibilities.
    • Recreation: Activities that refresh or renew energy.
    • Sports: Activities involving competition, rules, and goals.
    • Athletics: Organized, structured competitions among skilled athletes.

Measurement of Human Movement

  • Physical Fitness: Defined as attributes related to the ability to perform physical activities, grouped into:
    • Health-Related Fitness
    • Skill-Related Fitness
  • Health-Related Fitness Components:
    • Cardiorespiratory Fitness
    • Muscular Strength
    • Muscular Endurance
    • Body Composition
    • Flexibility
  • ACSM Definition of Physical Fitness:
    • Ability to carry out daily tasks with vigor, without undue fatigue, and with energy for leisure activities.

Specific Measures of Fitness

Health-Related Fitness Components
  1. Cardiorespiratory Fitness: Ability to perform moderate-to-vigorous exercise over extended periods, measured by VO2 (endurance).
  2. Muscular Strength: Defined as the maximum force exerted by muscles (1 repetition max, 1RM), improved through progressive overload.
  3. Muscular Endurance: Ability to maintain submaximal repeated muscle contractions over time.
  4. Flexibility: Range of motion at joints, changeable and measured with a goniometer.
  5. Body Composition: Relative amounts of fat mass and fat-free mass assessed through various techniques (skinfolds, DEXA, etc.).
Skill-Related Fitness Components
  • Attributes that contribute to athletic performance:
    • Agility: Ability to change body position quickly and accurately.
    • Balance: Ability to maintain stability.
    • Power: Rate of work done during muscle contractions.
    • Coordination: Ability to perform complex tasks smoothly.
    • Reaction Time: Time from stimulus to movement initiation.
    • Speed: Ability to perform movements quickly.

Health and Wellness Definitions

  • Health: Absence of illness/disease, positive physiological function, including dimensions of fitness.
  • Wellness: Overall state of well-being including dimensions like physical, emotional, social, and spiritual aspects.

Exercise Science Defined

  • Exercise Science: The scientific analysis of human motion, incorporating:
    • Biomechanics
    • Kinesiology
    • Anatomy
    • Physiology
    • Motor Behavior
    • Some aspects of Sports Medicine and Exercise Physiology.
  • Physiology: Function study of tissues, organs, and systems; Exercise Physiology: effects during and after exercise.

Applications of Exercise Physiology Research

  • Prevention: Mitigating development of diseases (e.g., cardiovascular disease).
  • Treatment: For various health issues and during rehabilitation.
  • Performance Enhancement: For elite athletes and physical training insights.

Foundational Researchers in Exercise Science

  • A.V. Hill: Precise measurement of muscle heat production.
  • August Krogh: Studies on fat metabolism and circulatory function during exercise.
  • Otto Meyerhof: Relationship between oxygen consumption and lactic acid.
  • C.G. Douglas: Breathing control during exercise at different altitudes.
  • J.S. Haldane: Role of CO2 in control of breathing.

Landmark Health Recommendations

  • Governing Bodies: ACSM, CDC, U.S. Surgeon General, NIH.
  • Aerobic Exercise Recommendations:
    • Moderate exercise: 150 to 300 min/week.
    • Vigorous exercise: 75 to 150 min/week.
  • Strength Training Exercise: Involve all major muscle groups on at least two days per week.

Exercise Science Subdisciplines

  • Includes:
    • Clinical Exercise Physiology
    • Biomechanics
    • Motor Learning
    • Strength & Conditioning
    • Cardiovascular Physiology
    • Others focusing on specific populations or factors.

Principles of Training in Exercise Science

  • FITT-VP Principle: Frequency, Intensity, Time, Type, and Volume/Progression.
  • Adaptability: Body's response to exercise.
  • Individualism: Variation in personal responses and training rates.

Bioenergetics

  • ATP Production: Important metabolic pathways including aerobic and anaerobic systems:
    • ATP-PCr System: Immediate energy supply (3-15 seconds).
    • Glycolysis: Breaks down glucose for quick energy (up to 2 minutes).
    • Oxidative Phosphorylation: Longer-term energy for endurance activities.

Types of Muscle and Functions

  • Muscle Types: Cardiac, Smooth, Skeletal (predominates in exercise).
  • Contraction Functions: Skeletal muscles are used for protection, stability, and movement.
  • Contraction Types and Force Production:
    • Isometric: No joint angle change (e.g., plank).
    • Isotonic: Joint angle changes (e.g., running).

Muscle Fiber Types

  • Type I (Slow Twitch): Aerobic, endurance-focused, high mitochondria density.
  • Type II (Fast Twitch): Anaerobic, power-focused, quicker to fatigue, larger motor units.
  • Training Effects on Muscle Fibers: Performance varies based on fiber types recruited during activities.

Nervous Innervation in Muscle Contraction

  • Action Potentials: Determine voluntary muscle contraction initiated by the nervous system.
  • Neuromuscular Junction: Critical for communication between the nervous system and muscle cells via neurotransmitters (acetylcholine).

Systems Interacting in Exercise

  • Cardiovascular System: Transports O2, nutrients, and hormones; removes waste.
  • Respiratory System: Facilitates ventilation and gas exchange.
  • Endocrine System: Regulates internal environment and metabolism.