Hypertrophy Strength

Which muscles are fast-twitch and which are slow?

Chris Beardsley is a biomechanics researcher. He is also the editor of Strength and Conditioning Research. He is based in Loughborough, Leicestershire. Most people associate slow-twitch muscle fibres (or type I) with marathon runners and Tour de France cyclists and fast-twitch muscle fibres (or type II) with Olympic sprinters and weightlifters. But like most aspects of the human body, things are never that black or white, and muscle fibre type actually varies a lot more between muscles than between individuals training for different sports. A long-accepted and widely-believed training theory is that focusing on developing the type II muscle fibres,…
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