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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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Percent relative error (RE) in energy expenditure (EE) across different exercise modalities for Fitbit (A) and Garmin (B). Negative bias in estimating EE is apparent across exercise modalities. The horizontal lines represent the mean. Asterisk indicates P=.03; # indicates P<.001 compared to Garmin. ADLs: activities of daily living, HIIT-C: high-intensity interval training-Cycle ergometer, HIIT-T: high-intensity interval training-Treadmill, MAX-C: MAX-Cycle ergometer, MAX-T: MAX-Treadmill.