The single square voltage pulse method and circadian rhythms

Using the SSVP (Single Square Voltage Pulse) method developed by Motoyama (1), the effect of circadian rhythms on meridian electrical conductivity at acupuncture points on the tip of fingers and toes was investigated. Five subjects were measured every hour for a 24-hour period. Subjects were kept in a closed location for that period of time but were asked to act normally otherwise. Subjects could decide what they want to do provided it reflected their normal behavior. Results showed a change in meridian electrical conductivity of 50% or more between the highest and lowest values. Furthermore, the maximum conductivity correlated with the subject self description of being a 'morning' vs. being an 'evening' person. This circadian rhythm was the main effect observable in a 24-hour period, overshadowing any other possible effect such as the meridian circadian rhythm of two-hour peak period for each meridian postulated by Traditional Chinese Medicine.

Reference:1. Motoyama, H., Smith, W.T. and Harada, T. 'Pre-polarization Resistance of the Skin as Determined by the Single Square Voltage Pulse Method' Psychophysiology, 21, 541-550, 1984.