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. 2018 Dec 10;6(12):e10338. doi: 10.2196/10338

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©Ravi Kondama Reddy, Rubin Pooni, Dessi P Zaharieva, Brian Senf, Joseph El Youssef, Eyal Dassau, Francis J Doyle III, Mark A Clements, Michael R Rickels, Susana R Patton, Jessica R Castle, Michael C Riddell, Peter G Jacobs. Originally published in JMIR Mhealth and Uhealth (http://mhealth.jmir.org), 10.12.2018.

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

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Bland-Altman plots showing heart rate measurements comparing Garmin and Fitbit relative to Polar for all data with activities indicated by color. Mean heart rate is shown on the x-axis, and the difference between the Garmin or Fitbit and the Polar heart rate is on the y-axis. The gray dotted line indicates the mean difference (bias) between the measurement, and the gray dashed lines indicate the limits of agreement. Panel A compares the Fitbit and the Polar. Panel B compares the Garmin (with activity indication) and the Polar. Panel C compares the Garmin (with no activity indication) and the Polar.