SCI Energy Systems & Exercise Physiology 2

Question 1

Excess Post-exercise Oxygen Consumption (EPOC) refers to:

Accepted Answer

Elevated oxygen uptake after exercise to restore homeostasis

Answer

EPOC is the elevated oxygen consumption that continues after exercise ends, used to restore ATP, replenish phosphocreatine, clear lactate, and return the body to homeostasis.

Question 2

The Krebs cycle (citric acid cycle), a key stage of aerobic metabolism, takes place in the:

Accepted Answer

Mitochondrial matrix

Answer

The Krebs cycle occurs in the mitochondrial matrix, where acetyl-CoA is oxidized to produce NADH, FADH2, and a small amount of ATP.

Question 3

Regular aerobic training improves the body's ability to use fat as fuel primarily by:

Accepted Answer

Increasing mitochondrial density and fat-oxidizing enzyme activity

Answer

Aerobic training stimulates mitochondrial biogenesis and upregulates fat-oxidizing enzymes, enabling muscles to burn fat more efficiently at any given intensity.

Question 4

During steady-state aerobic exercise, a rider's heart rate will typically:

Accepted Answer

Plateau and remain relatively constant

Answer

During steady-state exercise, oxygen supply meets demand, and heart rate stabilizes at a level appropriate for that workload.

Question 5

Which muscle fiber type is most resistant to fatigue and is preferentially recruited during low-intensity, prolonged cycling?

Accepted Answer

Type I (slow-twitch oxidative)

Answer

Type I (slow-twitch) fibers are highly oxidative, rich in mitochondria and capillaries, fatigue-resistant, and are the first fibers recruited during low-intensity aerobic exercise.

SCI - Stages Cycling Instructor Certification Practice Test

SCI - Stages Cycling Instructor Certification Practice Test

SCI Energy Systems & Exercise Physiology 2