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. 2018 Dec 20;17:186. doi: 10.1186/s12938-018-0617-y

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© The Author(s) 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — a Normalized contact impedance of all electrode–conductive gel combinations measured at 50 kHz. b Normalized mean change in contact impedance of all combinations with time measured for 1 h at 50 kHz. c Mean change in contact impedance of all combinations during each sub-time frame. d Score of all combinations with regard to the time property of contact impedance,*p < 0.05