皮肤是人体最大的器官,其结构是相对稳定的,但皮肤的功能和活力在一天中是随人体机能不断变化而出现规律变化。这种规律性变化是人体生物钟的一个重要组成部分,并具有一定的特征,暂称其为“皮肤生物钟”。皮肤生物钟是人体机能变化规律的缩影人体的新陈代谢活动在有规律地不停变化着,从晚上11时至凌晨5时处于最低水准,尤其在熟睡时由于迷走神经兴奋,使呼吸心跳次数减慢,血液流速减慢,大脑耗氧量降低,肾上腺皮质激素分泌量减少,但脑垂体分泌的生长激素增加,是峰值 The skin is the largest organ in the human body, its structure is relatively stable, but the function and vitality of the skin in the course of a day with the human body function changes and regular changes. This regular change is an important part of the body’s biological clock, and has certain characteristics, tentatively called it “skin biological clock.” Skin biological clock is a microcosm of changes in human body function Metabolism of the human body changes regularly and regularly, from 11 pm to 5:00 at the lowest level, especially when sleeping as the vagus nerve excitement, so that the number of breathing slows, blood Slowed flow, decreased oxygen consumption of the brain, decreased secretion of adrenal cortical hormone, but increased pituitary growth hormone secretion is the peak