Physical activity trackers energy expenditure semi-structured protocol steps validity. The Fitbit Charge HR provided heart rate estimates that were statistically equivalent to Polar monitor. The Apple Watch 1 had stronger validity than the Fitbit Charge HR for assessing overall EE and steps during aerobic exercise. For heart rate, Fitbit Charge HR produced its smallest MAPE in sedentary behaviors (7.2%), followed by aerobic exercise (8.4%), and light activity (10.1%).
Both monitors accurately assessed steps during aerobic activity (MAPE Apple: 6.2% MAPE Fitbit: 9.4%) but overestimated steps in light physical activity. This trend was consistent for the individual conditions. For estimating whole-trial EE, the mean absolute percent error (MAPE) from Fitbit Charge HR (32.9%) was more than twice that of Apple Watch 1 (15.2%). Criterion measures were obtained from an Oxycon Mobile for EE, a pedometer for steps, and a Polar heart rate strap worn on the chest for heart rate. Apple Fitness+ is a fitness service available only with Apple. Thirty-nine healthy adults wore the two monitors while completing a semi-structured activity protocol consisting of 20 minutes of sedentary activity, 25 minutes of aerobic exercise, and 25 minutes of light intensity physical activity. The purpose of this investigation was to examine the validity of energy expenditure (EE), steps, and heart rate measured with the Apple Watch 1 and Fitbit Charge HR.
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