The change in muscle fiber type that would most likely occur as a result of endurance training is
A) type I $\rightarrow$ type II
B) type IIx $\rightarrow$ type IIa
C) type IIa$\rightarrow$ type IIx
D) type IIx $\rightarrow$ type I

Question

Quizplus · Accepted Answer

Endurance training is associated with an increase in the number and size of mitochondria in muscle fibers, which enhances the muscles' ability to generate energy aerobically. This is typically associated with a shift towards a higher proportion of type IIa fibers, which are more aerobic in nature than type IIx fibers. Therefore, the change in muscle fiber type that would most likely occur as a result of endurance training is from type IIx to type IIa.

The Change in Muscle Fiber Type That Would Most Likely →\rightarrow→

The Change in Muscle Fiber Type That Would Most Likely $\rightarrow$