Slow twitch muscle fibers are a reservoir for creatine as they stockpile large amounts of critical metabolic substrate.

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Slow twitch muscle fibers, also known as Type I fibers, are more efficient at using oxygen to generate ATP for continuous, extended muscle contractions over a long time. They are not primarily designed to stockpile large amounts of creatine, which is more associated with fast twitch (Type II) fibers that are involved in short, explosive movements and rely more on creatine phosphate for quick ATP production.

Slow Twitch Muscle Fibers Are a Reservoir for Creatine as They