Effect of Sweating on Electrode-Skin Contact Impedances and Artifacts in EEG Recordings With Various Screen-Printed Ag/Agcl Electrodes

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Kalevo , L , Miettinen , T , Leino , A , Kainulainen , S , Korkalainen , H , Myllymaa , K , Töyräs , J , Leppänen , T , Laitinen , T & Myllymaa , S 2020 , ' Effect of Sweating on Electrode-Skin Contact Impedances and Artifacts in EEG Recordings With Various Screen-Printed Ag/Agcl Electrodes ' , IEEE Access , vol. 8 , pp. 50934-50943 . https://doi.org/10.1109/ACCESS.2020.2977172

Title: Effect of Sweating on Electrode-Skin Contact Impedances and Artifacts in EEG Recordings With Various Screen-Printed Ag/Agcl Electrodes
Author: Kalevo, Laura; Miettinen, Tomi; Leino, Akseli; Kainulainen, Samu; Korkalainen, Henri; Myllymaa, Katja; Töyräs, Juha; Leppänen, Timo; Laitinen, Tiina; Myllymaa, Sami
Contributor: University of Helsinki, HUS Comprehensive Cancer Center
Date: 2020
Language: eng
Number of pages: 10
Belongs to series: IEEE Access
ISSN: 2169-3536
URI: http://hdl.handle.net/10138/314795
Abstract: In response to the growing clinico-economic need for comprehensive home-based sleep testing, we recently developed a self-applicable facial electrode set with screen-printed Ag/AgCl electrodes. Our previous studies revealed that nocturnal sweating is a common problem, causing low-frequency artifacts in the measured electroencephalography (EEG) signals. As the electrode set is designed to be used without skin abrasion, not surprisingly this leads to relatively high electrode-skin impedances, significant impedance changes due to sweating and an increased risk of sweat artifacts. However, our recent electrochemical in vitro investigations revealed that the sweat artifact tolerance of an EEG electrode can be improved by utilizing an appropriate Ag/AgCl ink. Here we have investigated in vivo electrode-skin impedances and the quality of EEG signals and interference due to sweating in the population of 11 healthy volunteers. Commercial Ag and Ag/AgCl inks (Engineered Conductive Materials ECM LLC and PPG Industries Inc.) were used to test electrode sets with differently constructed ink layers. Electrode-skin impedances and EEG signals were recorded before and after exercise-induced sweating. There was extensive variation in the electrode-skin impedances between the volunteers and the electrode positions: 14.6 & x2013;200 (PPG electrodes) and 7.7 & x2013;200 (ECM electrodes). Sweating significantly decreased the impedances in most cases. The EEG signal quality was assessed by comparing average band powers from 0.5 to 2 Hz before and after sweating. Only slight differences existed between the ECM and PPG electrodes; however, the lowest band power ratio (i.e. the smallest increase in the band power due to sweating) was achieved with ECM electrodes.
Subject: Biomedical electrodes
bioimpedance
electroencephalography
screen printing
sleep monitoring
sweat artifact
OBSTRUCTIVE SLEEP-APNEA
QUALITY
SET
113 Computer and information sciences
217 Medical engineering
3111 Biomedicine
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