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Skin-electrode contact area in electrical bioimpedance spectroscopy. Influence in total body composition assessment
KTH, School of Technology and Health (STH), Medical sensors, signals and systems (MSSS).
KTH, School of Technology and Health (STH), Medical sensors, signals and systems (MSSS).ORCID iD: 0000-0002-6995-967X
KTH, School of Technology and Health (STH), Medical sensors, signals and systems (MSSS).
2011 (English)In: Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS, IEEE Engineering In Medicine and Biology Society , 2011, Vol. 2011, 1867-1870 p.Conference paper, Published paper (Refereed)
Abstract [en]

Electrical Bioimpedance Spectroscopy (EBIS) has been widely used for assessment of total body composition and fluid distribution. (EBIS) measurements are commonly performed with 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 commonly present 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 certain differences have been observed, especially at high frequencies, respect the same EBIS measurements using Ag/AgCl electrodes. In this work the influence of increasing the skin-electrode area on the estimation of body composition parameters has been studied performing experimental EBIS measurement. The results indicate that an increment on the area of the skin-electrode interface produced noticeable changes in the bioimpedance spectra as well as in the body composition parameters. Moreover, the area increment showed also an apparent reduction of electrode impedance mismatch effects. This influence must be taken into consideration when designing and testing textile-enable EBIS measurement systems.

Place, publisher, year, edition, pages
IEEE Engineering In Medicine and Biology Society , 2011. Vol. 2011, 1867-1870 p.
Series
IEEE Engineering in Medicine and Biology Society. Conference Proceedings, ISSN 1557-170X
National Category
Medical Laboratory and Measurements Technologies
Identifiers
URN: urn:nbn:se:kth:diva-69634DOI: 10.1109/IEMBS.2011.6090530ISI: 000298810001249PubMedID: 22254694Scopus ID: 2-s2.0-84055184527ISBN: 978-1-4244-4122-8 (print)OAI: oai:DiVA.org:kth-69634DiVA: diva2:485674
Conference
33rd Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS 2011; Boston, MA; 30 August 2011 through 3 September 2011
Note
QC 20120302Available from: 2012-01-29 Created: 2012-01-29 Last updated: 2012-12-13Bibliographically approved
In thesis
1. Sensor-Based Garments that Enable the Use of Bioimpedance Technology: Towards PersonalizedHealthcare Monitoring.
Open this publication in new window or tab >>Sensor-Based Garments that Enable the Use of Bioimpedance Technology: Towards PersonalizedHealthcare Monitoring.
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Functional garments for physiological sensing purposes have been utilized in several disciplinesi.e. sports, firefighting, military and medical. In most of the cases textile electrodes (Textrodes)embedded in the garment are employed to monitor vital signs and other physiologicalmeasurements. Electrical Bioimpedance (EBI) is a non-invasive and effective technology that canbe used for detection and supervision of different health conditions. In some specific applicationssuch as body composition assessment EBIS has shown encouraging results proving good degreeof effectiveness and reliability. In a similar way Impedance Cardiography (ICG) is anothermodality of EBI primarily concerned with the determination of Stroke Volume SV, indices ofcontractility, and other aspects of hemodynamics.EBI technology in the previously mentioned modalities can benefit from a integration with agarment; however, a successful implementation of EBI technology depends on the goodperformance of textile electrodes. The main weakness of Textrodes is a deficient skin-electrodeinterface which produces a high degree of sensitivity to signal disturbances. This sensitivity canbe reduced with a suitable selection of the electrode material and an intelligent and ergonomicgarment design that ensures an effective skin-electrode contact area.This research work studies the performance of textile electrodes and garments for EBIspectroscopy for Total Body Assessment and Transthoracic Electrical Bioimpedance (TEB) forcardio monitoring. Their performance is analyzed based on impedance spectra, estimation ofparameters, influence of electrode polarization impedance Zep and quality of the signals using asreference Ag/AgCl electrodes. The study includes the analysis of some characteristics of thetextile electrodes such as conductive material, skin-electrode contact area size and fabricconstruction.The results obtained in this research work present evidence that textile garments with a dry skinelectrodeinterface like the ones used in research produce reliable EBI measurements in bothmodalities: BIS for Total Body Assessment and TEB for Impedance Cardiography. Textiletechnology, if successfully integrated, may enable the utilization of EBI in both modalities andconsequently implementing wearable applications for home and personal health monitoring.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2013. x, 70 p.
Series
TRITA-STH : report, ISSN 1653-3836 ; 2012:6
Keyword
Bioimpedance, textrodes, textile electrodes, Impedance Cardiography, Body Composition
National Category
Medical Materials Medical Equipment Engineering
Identifiers
urn:nbn:se:kth:diva-107493 (URN)978-91-7501-603-0 (ISBN)
Public defence
2013-01-16, 3-221, Alfred Nobels Allé 10, Flemingsberg, 14:40 (English)
Opponent
Supervisors
Note

QC 20121213

Available from: 2012-12-13 Created: 2012-12-12 Last updated: 2016-02-04Bibliographically approved

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