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Personal Trainer Practice Questions

Category - NSCA

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Why are slow-twitch muscles more resistant to fatigue during exercise, thus making them better for longer duration exercises?

They have more developed sarcoplasmic reticula, which release calcium more quickly.
They have less developed sarcoplasmic reticula, which release calcium more quickly.
They have less developed sarcoplasmic reticula, which release calcium more slowly.
They have more developed sarcoplasmic reticula, which release calcium more slowly.

Explanation

Answer: C - Slow-twitch muscles are more resistant to fatigue during exercise because they have less developed sarcoplasmic reticula, which release calcium more slowly. This causes a slower rate of ATP hydrolysis, so they do not tire as quickly.

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