A highly successful endurance athlete would likely have ________________ compared to a sedentary person.
A)a higher percentage of type IIB fibers
B)a higher percentage of type I fibers
C)a higher percentage of type IIx fibers
D)an equal percentage of type I and type IIx fibers

Question

Quizplus · Accepted Answer

Endurance athletes rely heavily on slow-twitch muscle fibers (type I) for sustained aerobic activity, so a highly successful endurance athlete would likely have a higher percentage of type I fibers compared to a sedentary person. Type IIB fibers are fast-twitch and used for explosive movements, while type IIx fibers are also fast-twitch but used for high-intensity activity lasting less than 30 seconds.

A Highly Successful Endurance Athlete Would Likely Have ________________ Compared