Document Detail

Electrical skin impedance at acupuncture points.
MedLine Citation:
PMID:  17532733     Owner:  NLM     Status:  MEDLINE    
OBJECTIVES: To test whether electrical skin impedance at each of three acupuncture points (APs) is significantly lower than at nearby sites on the meridian (MP) and off the meridian (NP).
DESIGN: Two instruments - Prognos (MedPrevent GmbH, Waldershof, Germany), a constant-current (DC) device, and PT Probe (designed for this study), a 100-Hz sinusoidal-current (AC) device-were used to record electrical impedance at three APs (right Gallbladder 14, right Pericardium 8, and left Triple Energizer 1), and two control sites for each AP. Each AP, MP, and NP was measured four times in random order with each device.
SETTING: The study was conducted over a period of 4 days at the Oregon College of Oriental Medicine (OCOM).
SUBJECTS: Twenty (20) healthy adults (14 women and 6 men), all recruited from the OCOM student body and faculty, participated in the study.
RESULTS: The Prognos measurements had an intraclass correlation (ICC) = 0.84 and coefficient of variation (CV) = 0.43. The PT Probe had ICC = 0.81 and CV = 0.31. Impedance values at APs were not significantly less than at MPs or NPs. Impedance values at MPs were also not significantly less than NPs, although their individual p values were <0.05 in 4 of 6 cases. There was a significant trend of increasing impedance with repeated measurements with both the Prognos (p =0.003) and the PT Probe (p= 0.003).
CONCLUSIONS: Within the reliability limits of our study methods, none of the three APs tested has lower skin impedance than at either of the nearby control points. These results are not consistent with previous studies that detected lower skin impedance at APs than nearby sites. Further study is necessary to determine whether MPs have lower skin impedance than nearby NPs. Our study suggests caution is warranted when developing, using, and interpreting results from electrodermal screening devices. Further studies are needed to clarify the clinically important and controversial hypothesis that APs are sites of lower impedance.
Sean Pearson; Agatha P Colbert; James McNames; Meggan Baumgartner; Richard Hammerschlag
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Publication Detail:
Type:  Clinical Trial; Journal Article    
Journal Detail:
Title:  Journal of alternative and complementary medicine (New York, N.Y.)     Volume:  13     ISSN:  1075-5535     ISO Abbreviation:  J Altern Complement Med     Publication Date:  2007 May 
Date Detail:
Created Date:  2007-05-29     Completed Date:  2007-07-31     Revised Date:  2014-07-29    
Medline Journal Info:
Nlm Unique ID:  9508124     Medline TA:  J Altern Complement Med     Country:  United States    
Other Details:
Languages:  eng     Pagination:  409-18     Citation Subset:  IM    
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MeSH Terms
Acupuncture Points*
Electric Conductivity
Electric Impedance / classification*
Galvanic Skin Response*
Meridians / classification*
Middle Aged
Pain Measurement / methods
Reproducibility of Results
Research Design
Single-Blind Method

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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