Depending on the degree of stimulation, more and more individual muscle fibers contract, resulting in a stronger muscle contraction.

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This is known as the size principle of muscle fiber recruitment, which states that smaller, slower-twitch muscle fibers are recruited first, followed by larger, faster-twitch muscle fibers as the level of stimulation increases. This results in a stronger muscle contraction as more individual muscle fibers are recruited.

Depending on the Degree of Stimulation, More and More Individual