Document Detail


A study on electrode gels for skin conductance measurements.
MedLine Citation:
PMID:  20811086     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Low-frequency skin conductance is used within several clinical applications and is mainly sensitive to sweating and the moisture content of the stratum corneum, but also how electrodes introduce changes in the electrical properties. Four electrode gels were investigated with regard to sorption characteristics and electrical properties. Skin conductance time series were collected from 18 test subjects during relaxation, exercise and recovery, wearing different pairs of electrodes contralaterally on the hypothenar and the T9 dermatome. Pressure test was applied on the T9 electrodes. Impedance frequency sweeps were taken on the T9 electrodes the same day and the next, parameterized to the Cole model. ANOVA on the initial skin conductance level change, exercise response amplitude, recovery offset and pressure-induced changes revealed significant differences among gel types. The wetter gels caused a higher positive level change, a greater response amplitude, larger recovery offset and greater pressure-induced artifacts compared to the solid gels. Sweating on the T9 site led to negative skin conductance responses for the wetter gels. Correlations were found between the desorption measurements and the initial skin conductance level change (hypothenar: R = 0.988 T9: R = 0.901) RM-ANOVA on the Cole parameters revealed a significant decrease in R(s) of the most resistive gel. Clinical implications are discussed.
Authors:
Christian Tronstad; Gorm Krogh Johnsen; Sverre Grimnes; Ørjan G Martinsen
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Publication Detail:
Type:  Journal Article     Date:  2010-09-01
Journal Detail:
Title:  Physiological measurement     Volume:  31     ISSN:  1361-6579     ISO Abbreviation:  Physiol Meas     Publication Date:  2010 Oct 
Date Detail:
Created Date:  2010-09-13     Completed Date:  2010-12-22     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9306921     Medline TA:  Physiol Meas     Country:  England    
Other Details:
Languages:  eng     Pagination:  1395-410     Citation Subset:  IM    
Affiliation:
Department of Clinical and Biomedical Engineering, Oslo University Hospital-Rikshospitalet, Norway.
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MeSH Terms
Descriptor/Qualifier:
Artifacts
Electric Conductivity
Electrodes
Electrophysiology / methods*
Female
Galvanic Skin Response / physiology*
Gels / chemistry*
Humans
Male
Pressure
Time Factors
Water
Chemical
Reg. No./Substance:
0/Gels; 7732-18-5/Water

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


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