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Muscular System

How does a motor unit composition and innervation affect the strength of muscle contractions?

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May 31, 2008 10:58PM

Alterations in the nervous system firing pattern can occur as a result of training. Motor unit recruitment and the firing pattern to muscle can change with training also. The improvement in the firing pattern of nerves explains the initial improvement that occurs from strength training. Light exercise stimulates the recruitment of slow-twitch fibres whereas larger forces involved in things such as weight training recruit fast-twitch fibres. Please let me know if this helps- because that's what I wrote for my assignment!