Increased strength of a trained muscle is due to

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Increased strength in a trained muscle is primarily due to the nervous system's ability to recruit a large number of motor units simultaneously. As a muscle is trained, the nervous system learns to activate more muscle fibers within a muscle, resulting in increased strength. There may be some increase in muscle fiber size (hypertrophy) with training, but this is not the primary cause of increased strength. Elimination of enzymes or metabolic pathways, fat deposits, or connective tissue would not typically lead to increased strength in a trained muscle.

Increased Strength of a Trained Muscle Is Due to