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Medical Definition of Sharpey's fiber. : any of the thready processes of the periosteum that penetrate the tissue of the superficial lamellae of bones.
Slow & Fast Twitch Fibers. Every muscle is made up of two types of fibers. Fast-twitch fibers move 2 to 3 times faster than slow-twitch fibers, but they tire more easily. Fast-twitch fibers, logically, are used for sprinting and quick ascents. Inversely, slow-twitch fibers are used for long rides of moderate intensity.