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. 2020 Jan 22;4(1):e14857. doi: 10.2196/14857

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©Tomohiko Inui, Hiroki Kohno, Yohei Kawasaki, Kaoru Matsuura, Hideki Ueda, Yusaku Tamura, Michiko Watanabe, Yuichi Inage, Yasunori Yakita, Yutaka Wakabayashi, Goro Matsumiya. Originally published in JMIR Cardio (http://cardio.jmir.org), 22.01.2020.

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 JMIR Cardio, is properly cited. The complete bibliographic information, a link to the original publication on http://cardio.jmir.org, as well as this copyright and license information must be included.

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Schematic diagram of time series curves with matching measurement intervals (Step1). The figure shows the pulse rates (px) calculated on the smart watches and the corresponding heart rates (hx) on the electrocardiographic monitor at each time point (tx) when the pulse rate was calculated. The time interval (Δt) shown on this graph is dependent on the pulse rate measurements. The average of 10 consecutive pulse rates and 10 corresponding heart rates is Px and Hx, respectively. bpm: beats per minute.