If the slow-twitch muscle fiber of a marathon runner, weight lifter, and triathlon competitor (5k run, 1k swim, 10k bike) were compared, which of the following would represent the correct order, from highest to lowest, of the percentage of slow-twitch muscle in their bodies?

Question

Quizplus · Accepted Answer

Marathon runners have a high percentage of slow-twitch muscles because they rely on endurance rather than quick bursts of energy. Triathletes also require a lot of endurance, so they would have the second-highest percentage of slow-twitch muscles. Weight lifters rely on strength and power, so they would have the lowest percentage of slow-twitch muscles. Therefore, the correct order is Marathon runner, triathlete, weight lifter.

If the Slow-Twitch Muscle Fiber of a Marathon Runner, Weight