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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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Segment of heart rate (HR) recordings by 3 devices: electrocardiography (ECG) reference, chest strap, and photoplethysmography (PPG) watch. The red circles represent the instants when heart rate from those devices would be collected if these were a value per minute observation. It is evident how these values do not represent the actual second by second or even the average agreement among the 3 devices.