If a biopsy of the quadriceps (thigh extensor) muscles were taken from gold medal-winning speed skaters in the 4 events below, which would most likely have the SMALLEST percentage of type I muscle fibers?
A) 10,000 meters
B) 5,000 meters
C) 1,000 meters
D) 500 meters

Question

Quizplus · Accepted Answer

The shorter the event distance, the more the athlete relies on anaerobic metabolism and fast-twitch muscle fibers, which are typically type II fibers. Therefore, the 500-meter event would most likely have the smallest percentage of type I muscle fibers.

If a Biopsy of the Quadriceps (Thigh Extensor) Muscles Were