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Glossary AB CD EF GH IJ KL MN OP QR ST UV WX YZ Fast Twitch Muscle Fiber Also known as Type IIa and Type IIx (the more extreme form). Fast twitch fibers are larger in size and more predisposed to hypertrophy than slow twitch fibers. They also use primarily anaerobic means for energy which allows them to deliver greater force output with less endurance. |