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Muscle Fiber Type Comparisons
Comparison of Type 1, Type IIa and Type IIx muscle fiber types
Comparison Type I Type IIa Type IIx
Fiber Size Small Large Large
Contraction Speed Slow Fast Fast
ATPase type Slow Fast Fast
SR Development Low High High
Oxidative Capacity High Moderate Low
Reminder: SR refers to sarcoplasmic reticulum
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