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Electrical skin impedance at acupuncture points.

Sean Pearson1, Agatha P Colbert, James McNames

  • 1Biomedical Signal Processing Laboratory, Portland State University, Portland, Oregon, USA.

Journal of Alternative and Complementary Medicine (New York, N.Y.)
|May 30, 2007
PubMed
Summary

This study found no significant difference in electrical skin impedance between acupuncture points (APs) and nearby control sites. Results suggest caution when using electrodermal screening devices.

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Area of Science:

  • Integrative Medicine
  • Biophysics
  • Traditional Chinese Medicine

Background:

  • Acupuncture points (APs) are hypothesized to have lower electrical skin impedance.
  • Electrodermal screening devices are used to measure these impedance differences.

Purpose of the Study:

  • To investigate if electrical skin impedance at specific APs is lower than at nearby meridian points (MPs) and non-meridian points (NPs).

Main Methods:

  • Two devices, Prognos (DC) and PT Probe (AC), measured impedance at three APs and two control sites each.
  • Measurements were taken four times per site in random order on 20 healthy adults.

Main Results:

  • No statistically significant difference in impedance was found between APs and either MPs or NPs.

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  • Impedance at MPs was not significantly lower than NPs, though some individual p-values were <0.05.
  • Both devices showed a significant trend of increasing impedance with repeated measurements.

    • Conclusions:

    • The study did not support the hypothesis that APs have lower skin impedance than nearby control sites.
    • Results indicate a need for caution in the development and interpretation of electrodermal screening devices.
    • Further research is required to validate the electrodermal properties of APs and MPs.