ACSM Personal Trainer

Category - Exercise Programming and Implementation

Which type of muscle fiber is used during low intensity, long duration exercise?
  1. Type I
  2. Type II
  3. Type IIA
  4. Type IIB
Explanation
Answer: A - Type I myofibers are used during low intensity, long duration exercise. They are considered slow twitch, have high oxidative properties, and power activities such as running a marathon.
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