What physiological response is triggered by lifting weights?

Lifting weights triggers a physiological response that includes the process of muscle hypertrophy, which is the increase in the size and cross-sectional area of skeletal muscle fibers. When resistance is applied through weightlifting, it creates microtears in the muscle fibers. The body then responds by repairing these fibers, leading to muscle growth and increased strength. This adaptation occurs due to the combined effects of mechanical tension, muscle damage, and metabolic stress brought about by the exercise stimulus.

Increased muscle hypertrophy is essential for enhancing performance in various physical activities and improving overall body composition. The metabolic adaptations resulting from regular weightlifting also contribute to increased resting energy expenditure, making it an effective strategy for improving fitness and body composition.