ASIN 500 Introduction to Nutrition Lecture 10 Energy Systems & Exercise Metabolism

Flashcards on Energy Systems & Exercise Metabolism

ATP

Adenosine Triphosphate, the energy currency used by the body to perform tasks.

Anaerobic System

Energy system used for high-intensity, short bursts of activity, like sprinting or lifting.

Anaerobic Pathways

Two pathways are ATP-PC system (0-10 seconds, using stored creatine phosphate) and Glycolysis (breaks down glucose, producing lactic acid)

Aerobic System

Energy system that kicks in after ~2 minutes of steady activity and uses oxygen to break down carbs, fats, and a bit of protein.

Hydrolysis

The breakdown of ATP.

ATPase

Enzyme used in the breakdown (hydrolysis) of ATP.

Sources of ATP

Blood Glucose, Muscle Glycogen, Fats (Adipose Tissue), Proteins (Amino Acids)

Ways ATP can be produced

Anaerobically by the phosphagen system and the lactic acid system (2 systems). Aerobically: From Carbohydrate, fats and protein (1 system)

Phosphocreatine system

Immediate energy system; anaerobic production of ATP from stored phosphocreatine.

Lactic acid system

Glucose breakdown (glycolysis); build up of lactic acid; short-term system

Aerobic glycolysis

Moderate to high intensity. Carbohydrate stores are limited.

Oxygen system

Prolonged low-intensity exercise

Activity Intensity Categories

Extreme intensity (5-10s), Very High intensity (20s-2 mins), High intensity (2 mins - 20 mins), Moderate intensity (>20 mins)

Crossover Concept

The shift from fat to glucose metabolism as exercise intensity increases.