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

An RER of 1.0 reflects complete carbohydrate oxidation (6CO2 produced per 6O2 consumed, ratio = 1.0).

Question 2

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

Accepted Answer

Ventilatory threshold

Answer

The ventilatory threshold (VT1) corresponds closely to the lactate threshold and marks the onset of non-linear ventilatory increase.

Question 3

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

Accepted Answer

30–40 L/min

Answer

Elite endurance athletes can achieve maximal cardiac outputs of 30–40 L/min due to high stroke volumes (up to 200 mL/beat).

Question 4

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

Accepted Answer

Aldosterone

Answer

Aldosterone is released during exercise-induced dehydration and acts on renal tubules to retain sodium and water.

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 crossover concept describes the intensity at which carbohydrate becomes the dominant fuel source, crossing over fat utilization.

BHK - Bachelor of Kinesiology Practice Test