As monitors grow as an intervention tool, questions of validity become paramount and it is important to assess their accuracy for this purpose.Īccuracy is measured by evaluating the device against a research-grade criterion measure. With the increase in popularity, wearable-based behavioral change interventions are becoming more prevalent. In 2015, 232 million wearable electronic devices were sold worldwide, with a projected 18.4% increase in sales for 2016. In addition to physical activity and energy expenditure (EE), more recent wearable models are designed to measure heart rate at the wrist. Commercial physical activity tracking wearable devices have emerged as an increasingly popular method for consumers to assess their daily activity and calories expended. According to self-report data, the proportion of adults meeting the guidelines was 62.0%, but this dropped to 9.6% for accelerometry measures of activity, which illustrates the importance of objective measures of activity. The Physical Activity Guidelines for Americans suggest adults achieve 150 minutes of moderate to vigorous physical activity (MVPA) per week. The device measured higher EE at all stages ( P<.001). The device measured higher HR readings at start, baseline, light intensity, moderate intensity ( P<.001), and recovery ( P=.04). HR was not significantly different at vigorous intensity ( P=.35). For Garmin Forerunner 225, HR MAPE was between 7.87% and 24.38%. EE was not significantly different at vigorous ( P=.70) or recovery ( P=.10). The device measured higher EE at baseline ( P=.003), light intensity ( P<.001), and moderate intensity ( P=.001). HR was not significantly different at the start ( P=.67) or during moderate intensity ( P=.34) lower HR readings were measured during baseline, vigorous intensity, and recovery ( P<.001) and higher HR during light intensity ( P<.001). For the Fitbit device, the HR MAPE was between 2.38% and 16.99%. The device measured higher EE at all stages ( P<.01). HR was not significantly different at the start ( P=.78), during baseline ( P=.76), or vigorous intensity ( P=.84) lower HR readings were measured during light intensity ( P=.03), moderate intensity ( P=.001), and recovery ( P=.004). For the Apple Watch, HR MAPE was between 1.14% and 6.70%.
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