A wide range of devices exist for both research and the consumer market. Device outputs are converted into various estimates for physical activity, energy expenditure, sleep, and heart rate (for devices with a heart rate sensor). In a research setting, accelerometers are often used to objectively measure movement behavior (eg, sleep, physical activity, and sedentary behavior). On average, the Polar Vantage watch reported higher outputs compared to those reported by the Oura ring for steps, moderate-to-vigorous physical activity, and total energy expenditure. Neither the Polar watch nor the Oura ring can replace the ActiGraph when it comes to measuring steps, moderate-to-vigorous physical activity, and total energy expenditure, but they may be used as additional sources of physical activity measures in some settings. As for sleep duration, the Polar watch and Oura ring can potentially be used as replacements for a manual sleep diary, depending on the acceptable error. However, the mean absolute percentage error was high for all variables except Oura ring–derived sleep duration (10%) and resting heart rate (3%), which the Oura ring underreported on average by 1 beat per minute.Ĭonclusions: The Oura ring can potentially be used as an alternative to the Actiheart to measure resting heart rate. Oura ring–derived resting heart rates had a very strong correlation ( P<.001) with the Actiheart-derived resting heart rates ( r=0.9, 95% CI 0.85-0.96). We analyzed repeated measures correlations, Bland-Altman plots, and mean absolute percentage errors. We assessed Polar watch and Oura ring validity and comparability for measuring physical activity, total energy expenditure, resting heart rate (Oura), and sleep duration. Methods: A total of 21 participants wore 2 consumer-based activity trackers (Polar watch and Oura ring), an ActiGraph accelerometer (ActiGraph LLC), and an Actiheart accelerometer and heart rate monitor (CamNtech Ltd) and completed a sleep diary for up to 7 days. Objective: The objective of this study was to compare the Polar Vantage watch (Polar Electro Oy) and Oura ring (generation 2 Ōura Health Oy) activity trackers to research-based instruments for measuring physical activity, total energy expenditure, resting heart rate, and sleep duration in free-living adults. However, the accuracy of newer consumer-based devices is mostly unknown, and validation studies are needed. JMIR Bioinformatics and Biotechnology 31 articlesĮmail: Consumer-based activity trackers are increasingly used in research, as they have the potential to promote increased physical activity and can be used for estimating physical activity among participants.JMIR Biomedical Engineering 66 articles.Journal of Participatory Medicine 76 articles.JMIR Perioperative Medicine 86 articles.JMIR Rehabilitation and Assistive Technologies 189 articles.JMIR Pediatrics and Parenting 266 articles. ![]() Interactive Journal of Medical Research 286 articles.JMIR Public Health and Surveillance 1071 articles. ![]()
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