OBJECTIVETo analyze and evaluate practical significance of the ebb-flow theory of ying-qi.

METHODSBased on The Yellow Emperior's Internal Classic, the comparisons of the number of channels, collaterals and their bone-length measurement participating in ebb-flow of ying-qi, ying-qi ebb-flow theory with the practically respiratory-pulse ratio, human heart rate and pulse rate, human respiratory times, ying-qi ebb-flow theory with early channel theory, ying-qi ebb-flow theory with degrees of whole day, were tested and verified.

CONCLUSIONPractically, the ying-qi ebb-flow theory conforms few to human body, which possibly is an assumption of the ancients.