Bodybuilding - Static Contractions

Static Contractions

Static Contractions: A muscle contraction is static when the length of the muscle does not shorten during contraction. All muscle fibers enervated by a single motor nerve fiber from the spinal cord are called motor units, each of which may supply up to 150 or more muscle fibers. The strength of contraction increases in proportion to the number of motor units fired. Although a whole muscle cannot fully contract at once, a single fiber of it contracts fully, never partially, when stimulated by a motor nerve fiber. As the number of contracting motor units increases, the force of contraction increases proportionally. This also occurs when a muscle is tensed without movement. High intensity training over a prolonged period of time improves the ability of a neuro muscular system to recruit a greater number of motor units (volley firing), and thus creates a greater number of muscle fibers to contract.

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