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fast-twitch fiber |
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fast-twitch (FT) fiber, a muscle fiber that can develop high tension rapidly. It is usually innervated by a single alpha neuron and has low fatigue resistance, low capillary density, low levels of aerobic enzymes, and low oxygen availability. FT fibers are used in such activities as sprinting, jumping, and weight-lifting. Also called fast-twitch muscle fiber. See also slow-twitch fiber. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Furthermore, studies have shown that glycogen is depleted faster from fast-twitch fibers, especially during interval type work . The fast-twitch fibers contract more forcefully than the slow-twitch but have no blood supply and can only fire for a relatively short period of time before fatiguing from physiologic acidic (lactic) build-up and adenosine tri-phosphate (ATP) depletion. This is the opposite of what would be predicted, because the use of electrical stimulation should attenuate or reverse the typical shift toward fast-twitch fibers following SCI injury (32-34) and lower F50s. |
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