SCI Energy Systems & Exercise Physiology 3

Question 1

In exercise physiology, the Fick equation is used to calculate:

Accepted Answer

Oxygen consumption (VO2)

Answer

The Fick equation states that VO2 equals cardiac output multiplied by the arteriovenous oxygen difference, linking cardiovascular and muscular oxygen extraction.

Question 2

Zone 2 (low-intensity aerobic) training in an indoor cycling class primarily relies on which energy system?

Accepted Answer

Oxidative system using fat as the primary fuel

Answer

Zone 2 corresponds to low-intensity aerobic exercise where the oxidative system, burning predominantly fat, supplies the majority of ATP.

Question 3

How does exercising at altitude primarily affect aerobic performance?

Accepted Answer

It reduces oxygen partial pressure, decreasing aerobic capacity

Answer

At altitude, lower atmospheric pressure reduces oxygen partial pressure, limiting oxygen delivery to working muscles and impairing aerobic performance.

Question 4

The phosphocreatine (PCr) energy system can sustain maximal effort for approximately:

Accepted Answer

8–10 seconds

Answer

Phosphocreatine stores in the muscle are depleted within approximately 8–10 seconds of all-out maximal effort.

Question 5

Which hormone plays the most critical role in preventing blood glucose from dropping too low during prolonged cycling exercise?

Accepted Answer

Glucagon

Answer

Glucagon is released by the pancreas when blood glucose falls, stimulating the liver to break down glycogen and release glucose into the bloodstream.

SCI - Stages Cycling Instructor Certification Practice Test

SCI - Stages Cycling Instructor Certification Practice Test

SCI Energy Systems & Exercise Physiology 3