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ACSM Personal Trainer

Category - Exercise Leadership and Client Education

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Which is true of Type II muscle fibers?

Aerobic
Fatigue-resistance
Use energy sources from within the muscle
Slower than Type I muscle fibers

Explanation

Answer: C - Type II muscle fibers are anaerobic fibers which succeed best at powerful, high-intensity speed tasks. Therefore, they are faster than Type I muscles but do not resist fatigue as well.

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