Muscle motor unit recruitment follows the pattern of the SO (I) fibers being recruited first followed by the FOG (IIa) and then ultimately by the FG (IIx) if and when workloads require this. Muscle fatigue follows the order that the FG fibers fatigue first, followed by the FOG fibers and finally (maybe never) the SO fibers. Explain how it makes sense physiologically that the last fibers to be recruited to contract are the first to fatigue, while the first fibers to be recruited to contract would be the last to fatigue.

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Types of muscle fibers are slow oxidative SO fast ... View the full answer