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ACTN3: The "sprint gene"
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ACTN3: The "sprint gene"
The ACTN3 gene encodes the protein alpha-actinin-3, which is primarily expressed in fast-twitch (Type IIa & IIx) skeletal muscle fibers. These fibers are responsible for generating rapid, powerful contractions used in activities like sprinting, weightlifting, and jumping. However, they fatigue more quickly than slow-twitch (Type I) skeletal muscle fiber. Often dubbed the “sprinter gene,” ACTN3 influences muscle performance, particularly in elite…
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