Muscles comprise two primary types of fibers: slow-twitch (type one) and fast-twitch (type two), differentiated by their contraction speeds and fatigue rates. Generally, slow-twitch fibers are engaged in low-intensity activities and are more enduring, while fast-twitch fibers handle powerful, quick actions but fatigue faster. Human muscles are a mix of both, with elite athletes having more of one type depending on their specialization.
As people age, there's a noticeable loss of fast-twitch fibers, emphasizing the importance of strength training for older adults to counteract risks like falls and frailty. In this clip, Dr. Martin Gibala explains how vigorous activity engages both slow- and fast-twitch muscle fibers and delves into the effects of aging on these fibers.
Interview published on Sep 19, 2023
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#HIIT #muscle #aging
