Cite
 

Meaning of fast-twitch

fast-twitch

Pronunciation: (fast'twich", fäst'-), [key]
— adj. Physiol.
  1. of or pertaining to muscle fiber that contracts relatively rapidly, utilized esp. in actions requiring maximum effort of short duration, as sprinting (distinguished from slow-twitch).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.