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. 2022 Mar 23;10:820217. doi: 10.3389/fbioe.2022.820217

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Copyright © 2022 Spanu, Mascia, Baldazzi, Fenech-Salerno, Torrisi, Viola, Bonfiglio, Cosseddu and Pani.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Root-mean-square values for low-frequency (less than 0.5 Hz, (A) and high-frequency (greater than 0.5 Hz, (B) noises and the SNR values (C) characterizing the ECG recordings acquired by non-breathable tattoo (NBT), breathable tattoo (BT), and commercial gelled Ag/AgCl electrodes (AgCl). In the low-frequency noise root-mean-square representation, two outliers for non-breathable tattoo (close to 1.4 and 1.8 mV, respectively) and one for breathable tattoo (near 1.2 mV) were not represented for the sake of clarity.