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Rebekah Lynn, Rebekah Pfitzer, Rebecca R. Rogers, Christopher G. Ballmann, Tyler D. Williams and Mallory R. Marshall

representation of steps counted, especially in activities of daily living when the upper extremity is fixed. Wrist-worn activity monitors also vary in accuracy when compared to one another. In one study, Apple Watch devices placed third in step-counting accuracy out of all devices studied and first out of all

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Kayla J. Nuss, Joseph L. Sanford, Lucas J. Archambault, Ethan J. Schlemer, Sophie Blake, Jimikaye Beck Courtney, Nicholas A. Hulett and Kaigang Li

Over the last several years, wearable devices, such as the Apple Watch, have become ubiquitous. It was estimated that worldwide sales will exceed 14.7 billion U.S. dollars by 2026 ( “Fitness App 2019 Global Market Net Worth US$ 14.7 billion Forecast By 2026 - MarketWatch,” 2019 ). Two features that

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Zachary C. Pope, Nan Zeng, Xianxiong Li, Wenfeng Liu and Zan Gao

specific models of the Fitbit and Jawbone despite the rising popularity of other smartwatches (e.g., Apple Watch). Moreover, few studies have employed indirect calorimetry as the criterion EE measure—an assessment method commonly considered the ‘gold standard’ for EE measurement ( Kenney, Wilmore

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Kathryn J. DeShaw, Laura Ellingson, Yang Bai, Jeni Lansing, Maria Perez and Greg Welk

.g., Fitbit, Jawbone, Apple Watch, Polar). These devices are user-friendly, comfortable to wear, and offer potential to both assess and promote PA. Unfortunately, the literature on the validity of these devices is equivocal due to inherent differences in validation methods, including differences in outcome measures

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Alyssa Evans, Gavin Q. Collins, Parker G. Rosquist, Noelle J. Tuttle, Steven J. Morrin, James B. Tracy, A. Jake Merrell, William F. Christensen, David T. Fullwood, Anton E. Bowden and Matthew K. Seeley

Gear, and Apple Watch) to accurately estimate energy expenditure is low enough to have negative implications for people who desire to use the wearables to lose body weight ( Shcherbina et al., 2017 ; Wallen, Gomersall, Keating, Wisløff, Coombes, 2016 ). Indirect calorimetry can be used to accurately

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James W. Navalta, Jeffrey Montes, Nathaniel G. Bodell, Charli D. Aguilar, Ana Lujan, Gabriela Guzman, Brandi K. Kam, Jacob W. Manning and Mark DeBeliso

, & Valk, 2016 ; Modave et al., 2017 ; Wen, Zhang, Liu, & Lei, 2017 ). Eight participants completed treadmill walking and running at various speeds while wearing devices (the Apple Watch, Microsoft Band, and Fitbit Surge), and it was determined that the Fitbit Surge showed the most variance compared to

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Scott A. Conger, Alexander H.K. Montoye, Olivia Anderson, Danielle E. Boss and Jeremy A. Steeves

walking speed increased for three of the monitors while step-counting error increased as speed increased for two of the monitors ( Fokkema et al., 2017 ). Only the Apple Watch Sport was fairly consistent across all speeds ( Fokkema et al., 2017 ). Chow, Thom, Wewege, Ward, and Parmenter ( 2017 ) found

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Ciarán P. Friel and Carol Ewing Garber

for the parent study included being 18 years of age or older, a resident of United States, and a current or former user of a PAM. The parent study advertisement asked, “Do you currently use, or have you ever used, a wearable activity monitor (e.g., Fitbit, Apple Watch, etc.)?” and included a link to

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Susan Park, Lindsay P. Toth, Scott E. Crouter, Cary M. Springer, Robert T. Marcotte and David R. Bassett

the Apple Watch Series 2 (ApW, version 5.0), Fitbit Alta (FA, version 4.0), Garmin vivofit 3 (GV, version 4.2.1.1), and ActiGraph GT9X (GT9X, version 1.7.1). Hip-worn activity monitors included the Yamax Digi-Walker SW-200 (SW200), Omron HJ-325 (HJ325), Fitbit Zip (FZ, version 90), and ActiGraph GT9X

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Marianne I. Clark and Matthew W. Driller

health information but also afford new ways of monitoring and visualizing the human body ( Lupton, 2014 , 2016 ). For example, commercially available self-tracking wearables (e.g., Jawbone, Fitbit, Apple Watch) capture and measure a range of bodily functions including physical activity, energy