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fast-twitch

[fast-twich, fahst-] /ˈfæstˌtwɪtʃ, ˈfɑst-/
adjective, Physiology
1.
of or pertaining to muscle fiber that contracts relatively rapidly, utilized especially in actions requiring maximum effort of short duration, as sprinting (distinguished from slow-twitch).
Also, fasttwitch.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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