Skin-Electrode Contact Area in Electrical Bioimpedance Spectroscopy. Influence in Total Body Composition Assessment.

摘要

Electrical Bioimpedance Spectroscopy (EBIS) has been widely use for assessment of total body composition and fluid distribution. (EBIS) measurements are commonly performedwith electrolytic electrodes placed on the wrist and the ankle with a rather small skin–electrode contact area. The use of textile garments for EBI requires the integration of textrodes with a larger contact area surrounding the limbs in order to compensate the absence of electrolytic medium commonlypresent in traditional Ag/AgCl gel electrodes. Recently it has been shown that mismatch between the measurements electrodes might cause alterations on the EBIS measurements.When performing EBIS measurements with textrodes certaindifferences have been observed, especially at high frequencies,respect the same EBIS measurements using Ag/AgClelectrodes. In this work the influence of increasing the skinelectrodearea on the estimation of body compositionparameters has been study performing experimental EBISmeasurement. The results indicate that an increment on thearea of the skin-electrode interface did produce noticeablechanges in the bioimpedance spectra as well as in the bodycomposition parameters. This influence must be taken into consideration when designing and testing textile-enable EBIS measurement systems.