Physical activity Flashcards

1
Q

Energy metabolism

A

Catabolism of glucose, fatty acids, amino acids, or alcohol

Energy stored in C - H bonds is captured in ATP

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2
Q

Glucose energy

A

Anaerobic: glycolysis (glucose oxidation) splits glucose molecule to form 2 pyruvate molecules
Forms small amount of ATP

Aerobic: oxidizes glucose, pyruvate enters aerobic respiration pathways

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3
Q

Three major energy systems

A

Phosphocreatine (PCr) = anaerobic

Lactic acid - anaerobic

Oxygen - aerobic

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4
Q

Lactic acid energy

A

ANAEROBIC

Glucose –> pyruvate –> lactic acid
Forms enough ATP for 30 - 40 seconds

Lactic acid releases hydrogen ions and becomes lactate, which enters the bloodstream

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5
Q

Oxygen energy system

A

During aerobic conditions, muscle cells completely metabolize glucose and produce 18X more ATP

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6
Q

Aerobic Capacity

A

VO2 Max: maximal oxygen intake during vigorous physical exertion

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7
Q

Fat or Carb fuel?

A

Fat: when at rest/during low/moderate intensity activity
Carbs: high-intensity
Protein: small amount during endurance exercise

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8
Q

Carb Loading

A

CHO loading

Manipulate physical activity/dietary patterns before an athletic event to increase muscle glycogen stores

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