myofibrillar hypertrophy

Myofibrillar hypertrophy refers to the growth of the muscle fibers' internal components, specifically the myofibrils, which are the basic units responsible for muscle contraction. When engaging in strength training with heavier weights and lower repetitions, the stress causes these myofibrils to increase in size and number, resulting in greater muscle density and strength. Unlike other types of muscle growth that enlarge muscle volume more visibly, myofibrillar hypertrophy focuses on making muscles stronger and more efficient by enhancing the internal structural framework. This adaptation is key for improving functional strength and muscular endurance.