《黄帝内经·灵枢·根结》
人的经脉运行全身，一日一夜五十周，以供养五脏精气，如果太过或不及而不应此数的，就会生病，这叫做狂生。
一日一夜五十营，以营五脏之精，不应数者，名曰狂生。
The human meridians run throughout the body, circulate 50 times a day and night, in order to nourish the vital essences of the five viscera. If it is too much or too little and does not follow this number, it will get sick, which is called狂生.