Abundant evidence indicates that rigorous exercise training can result in a conversion of muscle fiber type.

Question

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Rigorous exercise training has been shown to result in a shift from Type IIx to Type IIa muscle fibers, which are more oxidative and better suited for endurance activities. This conversion is believed to be due to an increase in mitochondrial density and aerobic enzyme content within the muscle fibers.

Abundant Evidence Indicates That Rigorous Exercise Training Can Result in a Conversion