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. 2021 Jun 4;9(6):e26006. doi: 10.2196/26006

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©Dan E Webster, Meghasyam Tummalacherla, Michael Higgins, David Wing, Euan Ashley, Valerie E Kelly, Michael V McConnell, Evan D Muse, Jeffrey E Olgin, Lara M Mangravite, Job Godino, Michael R Kellen, Larsson Omberg. Originally published in JMIR mHealth and uHealth (https://mhealth.jmir.org), 04.06.2021.

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 mHealth and uHealth, is properly cited. The complete bibliographic information, a link to the original publication on https://mhealth.jmir.org/, as well as this copyright and license information must be included.

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Validation of heart rate measurements across different skin tones and hardware configurations in the calibration study. (A) Percent error in heart rate estimation from ground truth as a function of different colors captured by spectrocolorimetry under the jaw. Each dot represents a 10 second window of heart rate in one individual. (B) Distribution of concordance between heart rate using pulse oximetry and smartphone as the confidence cutoff is changed. Red line represents the chosen cutoff used for analysis. (C) Concordance as a function of smartphone models and Fitzpatrick skin tones. ITA: individual typology angle.