Exercise induced increases in muscle fiber number.

摘要: The effect of weight-lifting, which induced muscular enlargement, on fiber number was tested in the flexor carpi radialis muscle by operantly conditioning 6 cats to flex their right wrist against increasing resistance for an average 101 weeks. left used as a control. At end training, were performing "one-arm" lifts with 57% body weight. There 11% greater weight (P less than 0.01) and 9% 0.02) more fibers exercised muscles from limb left. This study using different method, supports our earlier observations that prolonged weight-lifting exercise significantly increases total fibers.