What are the muscle fiber types, contraction types, and the
energy sources utilized by muscle fibers?
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What are the muscle fiber types, contraction types, and theenergy sources utilized by muscle fibers?
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SKELETAL MUSCLE FIBER TYPES Classically skeletal muscle fibers can be categorized according to their speed of contraction and their resistance to fatigue These classifications are in the process of being revised but the basic types include Slow twitch oxidative type I muscle fibers Fasttwitch oxidativeglycolytic Type IIA muscle fibers and Fasttwitch glycolytic Type IIX fibers 1 Concentric Contractions A concentric contraction is a type of muscle contraction when the length of the muscles shorten while undergoing tension For example when you pick up a curl bar and perform a biceps curl the length of your biceps muscles shorten Your hands start down by your sides and ends with your hands up by your shoulders The biceps muscles shorten during this motion Another example would be if to perform a couple of leg curls on a hamstring machine
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