BHK Exercise Physiology 3

Question 1

The respiratory exchange ratio (RER) value of 1.0 indicates that the body is primarily oxidizing which substrate?

Accepted Answer

Carbohydrate

Answer

Fat

Answer

Protein

Answer

A 50/50 mix of fat and carbohydrate

Question 2

Which term describes the point during incremental exercise at which ventilation increases disproportionately relative to oxygen consumption?

Accepted Answer

Ventilatory threshold

Answer

Oxygen plateau

Answer

Anaerobic capacity

Answer

Reserve ventilation

Question 3

Cardiac output during maximal aerobic exercise in elite endurance athletes can reach approximately:

Accepted Answer

30–40 L/min

Answer

10–12 L/min

Answer

15–18 L/min

Answer

5–8 L/min

Question 4

Which hormone causes sodium and water retention by the kidneys, helping maintain plasma volume during prolonged exercise?

Accepted Answer

Aldosterone

Answer

Growth hormone

Answer

Glucagon

Answer

Epinephrine

Question 5

The 'crossover concept' in exercise metabolism refers to:

Accepted Answer

The intensity at which carbohydrate oxidation surpasses fat oxidation as exercise intensity increases

Answer

The point where fat oxidation surpasses carbohydrate oxidation as exercise intensity decreases

Answer

The shift from aerobic to anaerobic metabolism

Answer

The transition between fast- and slow-twitch fiber recruitment

Question 6

Mitochondrial biogenesis stimulated by endurance training is primarily mediated by which transcriptional coactivator?

Accepted Answer

PGC-1α

Answer

mTOR

Answer

NF-κB

Answer

AMPK alone