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What is the difference between Type I, Type IIa, IIb, IIx
Type I: slow twitch, slow oxidative, lots of capillaries/mitochondria and myoglobin. Resistant to fatigue. Type II: fast oxidative glycolitic, quick/forceful contractions. Fatigue faster, short duration high intensity ex. a: like slow twitch, moderately resistant to fatigue. x(d): fastest muscle type in humans, less dense in mitochondria, only short burst activities. b:fatigue rapidly, true fast twitch