Examination of electric characteristics of Hoku and Yintang acupuncture points

When the Hoku acupuncture point of the hand was stimulated, an electric current change which appeared at the Yintang point was measured by applying a DC voltage to the Yintang acupuncture point for five subjects. It was seen that the current increased immediately after stimulation, and it decreased gradually afterwards in all subjects. Moreover, the change in the skin surface temperature of the face before and after stimulation was measured by thermography, and the rise in heat was detected. Next, the change in the current and the AC phase at the Hoku point before and after exercise was measured. Results indicated the current increased by about 10% and the phase lagged behind by 5-10% after exercise. Finally, to understand the state change at the acupuncture point accurately, the equivalent circuit at the Hoku point was examined. In this case, the changes in the current and the phase of the AC voltage applied on the Hoku point without stimulation were measured, and the equivalent circuit that gave the same data was decided.