CSCS CSCS: Bioenergetics of Exercise & Training 2

Question 1

Which enzyme catalyzes the conversion of pyruvate to acetyl-CoA, linking glycolysis to the Krebs cycle?

Accepted Answer

Pyruvate dehydrogenase

Answer

Pyruvate dehydrogenase converts pyruvate to acetyl-CoA in the mitochondrial matrix, allowing aerobic carbohydrate oxidation to continue.

Question 2

The oxygen deficit is best described as the difference between:

Accepted Answer

Oxygen required and oxygen consumed during early exercise

Answer

Oxygen deficit is the gap between the oxygen theoretically required and the oxygen actually consumed during the initial non-steady-state phase of exercise.

Question 3

At what blood lactate concentration (mmol/L) is the lactate threshold (LT) classically defined in many laboratory protocols?

Accepted Answer

4 mmol/L

Answer

The 4 mmol/L fixed blood lactate threshold (often called OBLA) is a widely used marker in laboratory settings, though individual thresholds vary.

Question 4

Which of the following best explains why beta-oxidation is considered highly efficient for energy production?

Accepted Answer

It yields significantly more ATP per gram than carbohydrate

Answer

Fat yields approximately 9 kcal/g versus 4 kcal/g for carbohydrate, resulting in more total ATP per gram during beta-oxidation.

Question 5

During maximal sprint exercise lasting approximately 6 seconds, which energy system contributes the greatest percentage of ATP?

Accepted Answer

Phosphagen (ATP-PCr) system

Answer

The phosphagen system dominates ATP production during maximal efforts lasting ~6 seconds due to the immediate availability of PCr.

Certified Strength and Conditioning Specialist Practice Test

Certified Strength and Conditioning Specialist Practice Test

CSCS CSCS: Bioenergetics of Exercise & Training 2