Visualizing Electrical Potential Distribution Using a Point-by-Point Scanning Method: Preliminary Investigation on the Bioactive Points over the Skins of Rodents

Abstract

Objectives: Acupuncture points as bioactive points on human skin have special electrical properties, compared to points in surrounding areas. This article focuses on measuring skin electrical potentials in a rat model using a point-by-point scanning method. Materials and Methods: Animals were placed on a motorized stage with two orthogonal degrees of freedom. X- and Y-coordinates were set by stepper motors and determined the position of each measurement. A third orthogonal axis, the Z-axis, was under separate stepper control and was used to raise and lower the electrode, thus determining contact pressure between the electrode and the skin. The abdominal region, centered around the umbilicus, was chosen for the study. Data were processed to produce visual images. Results: Distribution mapping demonstrated the existence of high potential points that were distinct from surrounding regions. Positions and intensity of these high potential points were variable. Conclusions: High electrical potential points may have applicability in future acupuncture research.