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. 2023 Jul 11;10:1138051. doi: 10.3389/fmed.2023.1138051

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Copyright © 2023 Litvinova, Bilir, Parvanov, Niebauer, Kletecka-Pulker, Kimberger, Atanasov and Willschke.

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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A sensor device of the Biobeat (1 – the sensor device; 2 – a housing; 3 – a display; 4 – adjustable strap; 5 – battery; 6 – substrate; 7 – the light emitters; 8 – reflectors; 9 – the light detector). Diagram modified from reference (65).