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- Fast-twitch fibers are very quick to contract and come in two varieties123:
- Type 2A muscle fibers fatigue at an intermediate rate.
- Type 2B muscle fibers fatigue very quickly.
Learn more:✕This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links.Fast-twitch fibers are very quick to contract and come in two varieties: Type 2A muscle fibers which fatigue at an intermediate rate, and Type 2B muscle fibers which fatigue very quickly.www.mit.edu/activities/tkd/stretch/stretching_2.htmlTypes 2A and 2B are considered to be FT while type 1 fibers are ST. FT and ST refer to how fast muscles contract. The speed at which a muscle contracts is determined by how quickly it acts on ATP. ATP is a molecule that releases energy when it’s broken down. FT fibers break down ATP twice as fast as ST fibers.www.healthline.com/health/muscle-fibersFast-twitch muscle fibers (Type II) create short, powerful muscle contractions like those seen in explosive exercises such as sprinting, weightlifting, or box jumps, explains Scott Cheatham, a board-certified orthopedic physical therapist on the NASM Scientific Advisory Board.www.onepeloton.com/blog/fast-twitch-muscle-fibers/ - People also ask
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