The researchers performed a number of analyses to facilitate device comparison, including Pearson correlations between each device and the criterion measure, standardized typical error of the estimate for each device (a standardized version of “ the typical amount by which the estimate is wrong for any given subject”), the coefficient of variation for each device (standard deviation / mean × 100), and Bland-Altman plots for each device (which assess the agreement between devices by plotting the difference between two devices against the average value of both). Heart rate and energy expenditure were continuously measured using the Polar H10 chest strap and MetaMax 3B these were the criterion (reference) measurements to which the wearable devices were compared. 60 young and healthy individuals (30 males and 30 females age: 24.9 ± 3.0 years, BMI: 23.1 ± 2.7 kg/m2) completed five different activities (sitting, walking, running, resistance exercise, and cycling) for ten minutes each while wearing each of the devices. The presently reviewed study sought to evaluate the accuracy of three wrist-worn devices: the Apple Watch 6, the Polar Vantage V, and the Fitbit Sense. If we’re making significant adjustments guided by erroneous data, it might even harm our purpose. If they’re terrible, the act of tracking energy expenditure with wearable devices is pointless at best. However, whether or not such tracking is “pointless” or “harms our purpose” comes down to the validity, reliability, and utility of those measurements. The full quote, delivered in the context of business management guidance (although there’s disagreement regarding who actually said it first), reads: “What gets measured gets managed – even when it’s pointless to measure and manage it, and even if it harms the purpose of the organization to do so.” There would of course be considerable advantages conferred from valid, reliable, real-time measurement of energy expenditure data. However, you might be surprised to learn that the adage listed above is actually incomplete. You may have heard the old adage, “What gets measured gets managed.” This might be used as a justification for the increasingly common desire to utilize wearable technology in order to attain fitness goals.
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