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Myofibrillar Hypertrophy Rate

Meaning

Myofibrillar Hypertrophy Rate quantifies the speed at which the contractile proteins, primarily actin and myosin filaments within muscle fibers, increase in density and cross-sectional area due to resistance training stimulus. This is the primary driver of strength gains and is distinct from sarcoplasmic hypertrophy, which involves increased fluid or non-contractile elements. Optimizing this rate is a central goal in performance-focused hormonal health protocols aiming for structural adaptation. It reflects the efficiency of muscle protein accretion.