Practice Quiz

NASM Personal Trainer

Category - Exercises

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What type of muscle fibers make up the core musculature and what type of contractions best suit these muscles?
  1. Slow twitch, type II muscle fibers; quick short-term contractions
  2. Slow twitch, type I muscle fibers; longer sustained contractions
  3. Fast twitch, type I muscle fibers; quick short-term contractions
  4. Fast twitch, type II muscle fibers; longer sustained contractions
Explanation
Answer - B - Slow twitch, type I muscle fibers make up the core musculature and longer sustained contractions that best suit these muscles. Exercises that fit this description, such as the prone iso-ab (more commonly known as the plank), maintain longer contractions and are more beneficial to the core musculature.
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