Type IIa muscle fibers are often referred to as 'intermediate' because they:
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Correct answer: Have fast contraction with moderate aerobic capacity
Type IIa fibers are fast oxidative-glycolytic fibers. They possess the high myosin ATPase activity of fast-twitch fibers but also maintain a significant number of mitochondria and myoglobin to resist fatigue better than Type IIb fibers.
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