Size principle of motor unit recruitment
Автор: Mechanisms and Logic in Human Physiology
Загружено: 2022-09-05
Просмотров: 3715
Описание: Skeletal muscle fibers are grouped into motor units, each of which is innervated by a single motor neuron. This means that muscle contractions are generated and modulated by activating differing numbers of motor units. Because various motor units have specific thresholds of activity, a muscle contraction develops by stimulating motor units sequentially, from slowest and weakest to fastest and strongest. While slow type one fiber motor units are active during essentially all muscle contractions, high threshold fast twitch motor units are only incorporated during moderate and maximal efforts.
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