Science says:
1. Carry out systematic aerobic training regularly, and the muscles of the practitioners contract and stretch repeatedly during exercise to promote cell division and proliferation in tendons and ligaments; The muscle membrane thickens and the muscles become strong and elastic. Habitual and long-term muscle contraction can thicken muscle fibers, and the growth amount can ideally exceed 5%~ 10% of normal muscle. The thickening and longitudinal division and proliferation of muscle fibers increase the volume and weight of muscles, which is manifested as the change of human muscle morphology.
2. the main reasons why physical exercise can thicken muscle fibers are: exercise increases blood volume in the body-> participates in circulation->; In order to increase the oxygen supply of muscle, the number of capillaries in muscle increases, and the diameter of capillaries also increases, resulting in new capillaries, which increases the blood flow of muscle->; Improve the level of muscle metabolism->; Promote the thickening of human myofibrils. With the thickening of myofibrils, muscle fibers also thicken, and the volume of the whole muscle increases. Exercise can also increase the mitochondria that produce adenosine triphosphate in myofibrils and increase the content of adenosine triphosphate in myofibrils, thus increasing the ability of muscle contraction. Therefore, people who often take part in physical exercise are muscular and strong.