Compared to exercise in a cool environment, prolonged exercise in the heat
A) may decrease muscle production of free radicals.
B) increases muscle blood flow.
C) decreases muscle lactate production.
D) results in a more rapid onset of muscular fatigue.

Question

Quizplus · Accepted Answer

Prolonged exercise in the heat results in a more rapid onset of muscular fatigue due to increased core body temperature, dehydration, and increased glycogen use. Option A is incorrect because exercise in the heat increases the production of free radicals. Option B is partially correct because prolonged exercise in the heat initially increases muscle blood flow, but as dehydration and fatigue set in, blood flow is redirected to the skin to promote sweating and heat dissipation, which can impair muscle function. Option C is incorrect because prolonged exercise in the heat actually increases muscle lactate production as a result of increased anaerobic metabolism.

Compared to Exercise in a Cool Environment, Prolonged Exercise in the Heat