Which muscle fiber type is recruited FIRST during a low-intensity muscle contraction, according to Henneman's size principle?
Understand the Problem
The question is asking about Henneman's size principle, which describes the order in which motor units are recruited during muscle contractions. Specifically, it wants to know which type of muscle fiber is recruited first during a low-intensity contraction.
Answer
Type I muscle fibers are recruited first.
According to Henneman's size principle, Type I muscle fibers are recruited first during low-intensity muscle contractions due to their fatigue resistance and smaller size.
Answer for screen readers
According to Henneman's size principle, Type I muscle fibers are recruited first during low-intensity muscle contractions due to their fatigue resistance and smaller size.
More Information
Henneman's size principle explains the order in which motor units are recruited during muscle contraction, from smallest to largest, optimizing efficiency and delaying fatigue.
Tips
A common mistake is assuming larger, more powerful fibers are always recruited first; however, the body prioritizes efficiency and endurance at lower intensities.
Sources
- Henneman's size principle - en.wikipedia.org
- Henneman's Size Principle - Make huge strength & power gains - vbtcoach.com
- Motor unit recruitment - en.wikipedia.org
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