A skeletal muscle undergoes hypertrophy mainly by producing many more muscle fibers.

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Hypertrophy in skeletal muscles occurs when the existing muscle fibers increase in size, but not in number. The increase in size is due to the enlargement of the muscle fibers themselves, as well as an increase in the amount of protein within the fiber. The number of muscle fibers, also known as muscle hyperplasia, generally remains constant throughout adulthood.

A Skeletal Muscle Undergoes Hypertrophy Mainly by Producing Many More