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Conformable Wearable Electrodes: From Fabrication to Electrophysiological Assessment
Published on: July 22, 2022
A study on electrode gels for skin conductance measurements
Christian Tronstad1, Gorm Krogh Johnsen, Sverre Grimnes
1Department of Clinical and Biomedical Engineering, Oslo University Hospital-Rikshospitalet, Norway.
Physiological Measurement
|September 3, 2010
Summary
The choice of electrode gel significantly impacts low-frequency skin conductance measurements, affecting clinical applications. Wetter gels introduce more artifacts and altered responses compared to solid gels.
Area of Science:
- Biomedical Engineering
- Physiology
Background:
- Low-frequency skin conductance is a key physiological measurement.
- Its accuracy is influenced by electrode-skin interface properties, including gel moisture and electrical characteristics.
Purpose of the Study:
- To evaluate the impact of four different electrode gels on skin conductance measurements.
- To analyze sorption and electrical properties of gels and their influence on physiological signals.
Main Methods:
- Investigated four electrode gels for sorption and electrical properties.
- Collected skin conductance time series from 18 subjects under various conditions (relaxation, exercise, recovery).
- Performed pressure tests and impedance frequency sweeps, analyzing data with ANOVA and Cole model.
Main Results:
- Significant differences in skin conductance levels, exercise response, recovery, and pressure artifacts were observed among gel types.
- Wetter gels exhibited higher initial conductance, greater response amplitude, larger recovery offset, and more pressure artifacts.
- Sweating induced negative skin conductance responses with wetter gels; strong correlations found between gel desorption and initial conductance.
Conclusions:
- Electrode gel properties critically influence low-frequency skin conductance measurements.
- Wetter gels introduce significant artifacts, potentially compromising clinical interpretations.
- Gel selection is crucial for accurate physiological monitoring and clinical applications.
