When an Olympic weightlifter uses explosive strength to lift a personal best,the _________ fibers in her legs are probably the most active,but the marathon runner relies on her _________ fibers.
A) slow twitch;fast twitch
B) fast twitch;slow twitch
C) Type I;Type IIa
D) Type I;Type IIb

Question

Quizplus · Accepted Answer

Explosive strength requires the activation of fast-twitch fibers, which are better suited for generating large amounts of force quickly. On the other hand, marathon running relies on a steady supply of energy over a long period of time, which is better suited for slow-twitch fibers. Therefore, A and C are incorrect because they have reversed the order of which fibers are used for each activity. D is also incorrect because Type IIb fibers are not typically used for endurance activities like marathon running.

When an Olympic Weightlifter Uses Explosive Strength to Lift a Personal