Exercise efficiency is greater in subjects who
A)possess a higher percentage of fast muscle fibers.
B)possess a higher percentage of slow muscle fibers.
C)possess 50% fast fibers and 50% slow fibers.
D)None of the above answers are correct

Question

Quizplus · Accepted Answer

Slow muscle fibers have a high capacity for oxidative metabolism, which means they can produce ATP aerobically (with oxygen) for a long period of time. This makes them more efficient for endurance-type exercises, such as running long distances. Fast muscle fibers, on the other hand, have a high capacity for anaerobic metabolism, which means they can produce ATP without oxygen, but only for short bursts of energy. Therefore, possessing a higher percentage of slow muscle fibers would result in higher exercise efficiency.

Exercise Efficiency Is Greater in Subjects Who