Because exercise stimulates the secretion of adrenal hormones in the body, adrenal hormones can promote nerve excitability. Excessive fitness means high-intensity exercise, and more adrenal hormones will be secreted at this time.
Because all hormones in the human body promote and inhibit each other, at this time, in order to maintain the stability of the internal environment, the body will adjust the secretion of other hormones accordingly, which will maintain a balance, while for women, it will stimulate the hormones that affect menstruation, which will lead to the phenomenon of early or delayed menstruation. Fitness is for health, so it needs to be moderate.