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. 2018 Jul 2;20(7):e10108. doi: 10.2196/10108

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©Francesco Sartor, Gabriele Papini, Lieke Gertruda Elisabeth Cox, John Cleland. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 02.07.2018.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in the Journal of Medical Internet Research, is properly cited. The complete bibliographic information, a link to the original publication on http://www.jmir.org/, as well as this copyright and license information must be included.

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Correlation between 3 heart rate (HR) monitoring devices and the electrocardiography (ECG) reference. When the 2 chest straps and the wrist-worn photoplethysmography (PPG) heart rate monitors consistently disagree with the reference, their points depart from the 45-degree line in the same way.