Definition of fast-twitch in English:

fast-twitch

Syllabification: fast-twitch

adjective

[attributive] Physiology
  • (Of a muscle fiber) contracting rapidly, thus providing power rather than endurance.
    More example sentences
    • That explosion is what stimulates the fast-twitch muscle fibers, which are the ones you want to target for building mass.
    • The machine vibrates at such a high frequency it stimulates fast-twitch muscle fibers.
    • ‘That's an interesting question, but I'd say it combines reflexes for fast-twitch muscles and slow-twitch muscles, cardiovascularly and muscularly,’ he says.

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Word of the day coloratura
Pronunciation: ˌkələrəˈto͝orə
noun
elaborate ornamentation of a vocal melody