SCI Energy Systems & Exercise Physiology 3

Question 1

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

Accepted Answer

Oxygen consumption (VO2)

Answer

Maximum heart rate from age

Answer

Lactate threshold intensity

Answer

Caloric expenditure per minute

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

Phosphagen system

Answer

Fast glycolysis

Answer

Anaerobic glycolysis

Question 3

How does exercising at altitude primarily affect aerobic performance?

Accepted Answer

It reduces oxygen partial pressure, decreasing aerobic capacity

Answer

It increases oxygen partial pressure, boosting VO2 max

Answer

It has no measurable effect on oxygen delivery to muscles

Answer

It increases red blood cell destruction, worsening anemia

Question 4

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

Accepted Answer

8–10 seconds

Answer

30–60 seconds

Answer

2–3 minutes

Answer

20–25 seconds

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

Insulin

Answer

Cortisol

Answer

Aldosterone

Question 6

Mitochondrial biogenesis, a key adaptation to endurance training, refers to:

Accepted Answer

The creation of new mitochondria within muscle cells

Answer

The breakdown of existing mitochondria to supply energy

Answer

The relocation of mitochondria from fast- to slow-twitch fibers

Answer

The exclusive fusion of existing mitochondria into larger organelles

Question 7

Even mild dehydration of 2% body weight loss during exercise can:

Accepted Answer

Impair both aerobic performance and cognitive function

Answer

Significantly improve fat oxidation rates

Answer

Have no measurable effect on cycling performance

Answer

Increase VO2 max by reducing total body mass