Therapy using the acupuncture meridian system is an important part of traditional Chinese medicine. The purpose of this study was to investigate the electrical conduction properties of the meridians. The current conduction and potential profiles were compared after switching the current direction in the Hegu (LI-4) and Quchi (LI- 11) meridians and over a non-acupuncture point 1 cm from Quchi (LI-11) in 20 healthy subjects. Both meridians demonstrated significantly higher conductivity between Hegu (LI-4) and Quchi (LI-11) than between Hegu (LI-4) and the non-acupuncture point. The direction of current, peak frequency and absolute potential values in the direction Hegu (LI-4) to Quchi (LI-11) differed significantly from those in the direction Quchi (LI-11) to Hegu (LI-4). These results suggest that the conducting pathways are stronger in the meridians than in the non-meridians and that preferential conduction directions exist between two acupuncture points. These results are consistent with the theories of Qi-circulation and traditional Chinese medicine.

Acupuncture therapy is based on the principle of restoring equilibrium of the body's energy state by regulating the flow of Qi in the corresponding meridians and acupoints. The purpose of this study was to determine whether bio-energy transfer occurs during acupuncture of the meridians. We treated 20 normal healthy subjects with acupuncture and measured changes in the direct current (DC) potential between the stomach meridian points ST-39 and ST-37 in response to invasive insertion of a needle at ST-36. Using a crossover study design, the practitioner performed the procedure on each subject once with bare (uncovered) hands (ABH) and once wearing surgical gloves (ASH) to shield the electric energy transfer. ABH produced a response pattern to each stimulation, whereas ASH produced a response pattern only to the first step. ABH elicited a significantly higher response potential than did ASH (p < 0.001). These results suggest that there may be bio-energy (Qi) transfer during acupuncture along the meridians. This transferred bio-energy (Qi) seems to act as an electromotive force, which is purported to remove the stagnation or blockage of energy and restore an equilibrium state.

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