In comparison to type I muscle fibers, type II fibers ______.

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Type II muscle fibers are recruited at a higher percentage of maximum force, meaning they are capable of generating more force but fatigue more quickly than type I fibers. They also have a higher capacity for anaerobic energy production through glycolysis, but not through the electron transport system like type I fibers. Type II fibers rely more on carbohydrates for fuel rather than fat, and are not capable of greater endurance.

In Comparison to Type I Muscle Fibers, Type II Fibers