People's life activities are carried out according to time, growth and aging have obvious time rhythm, and the periodic changes of environment (alternation of day and night and seasons) affect the activities of tissues and organs and people's personality and behavior.
Many physiological and biochemical phenomena in the human body also show obvious circadian rhythm and seasonal changes. For example, body temperature, pulse, respiration, blood pressure, blood sugar, hormone concentration and metabolism all fluctuate day and night. There are four seasons in a year, spring, summer, autumn and winter, and so is a day, which respectively represent the signs of the change of human yang.
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The ancients thought that the time of gallbladder activity was 23:00- 1.
Other time sequences are as follows: ugly liver (1~3), lung (3~5) in yin, large intestine (5~7) in Taiyin, stomach (7~9) in Chen, spleen (9~ 1 1) and spleen (5 ~ 7) at noon. Shen (15~ 17) belongs to bladder, especially (17~ 19) belongs to kidney, Cheng (19~2 1) belongs to pericardium, and Hai (21)
In these twelve hours, from zi to liuyang, from noon to liuyin. At noon and noon, they practiced meridian, while Shi Mao and Youshi practiced You Mao. Yang is born in childhood, Yin is born at noon, and when Yin and Yang are born, it is very easy to promote the growth of Yin and Yang.