Under the same training conditions, the three hormones that are beneficial to muscle growth are auxin, insulin and testosterone. Auxin is secreted by the human body after deep sleep. The control of insulin is mainly the control of the intake of carbon and water in the diet, and the secretion of testosterone depends on many factors (such as intensive training, keeping a good sleep, eating more protein food, improving the body's muscle mass, etc.). ). The first two hormones are secreted by boys and girls, and the key lies in testosterone, which is beneficial to muscle synthesis, increases bone density, improves the body's basic metabolism, consumes more fat, and thus gains more lean body mass. Testosterone is secreted by human reproductive organs, and the amount of secretion varies from person to person. Of course, girls also secrete testosterone, but the secretion is far less than that of boys. These three hormones are indispensable for muscle growth. Obviously, girls are already at a disadvantage here.
In addition, there are great differences between girls and boys in physiological structure, such as bone density, physiological curvature of lumbar spine, skeletal muscle distribution and so on. To achieve muscle growth, we need to gradually overload, that is, we say to lift more weight, and then the bone density of girls is relatively lower than that of boys, so they also have a disadvantage in sports performance. So it is quite difficult for girls to become as strong as boys without using drugs.