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Apple Watch Fitness Tracking Examined in Peer-Reviewed Study: Key Findings Revealed by Reuters AP Newsletters

Posted on 6 June 2025

A recent peer-reviewed meta-analysis offers insights for Apple Watch users concerned about the accuracy of their Activity Ring data. The research highlights that Apple Watches excel in heart rate tracking and step counting, corroborating our experiences during the Apple Watch Series 10 review, which is Apple’s latest model. The study found a mean absolute percent error (MAPE) of only 4.43% for heart rate and 8.17% for step counts, indicating both metrics are well below the 10% error rate that denotes excellent performance in consumer wearables. Moreover, the meta-analysis suggests that newer Apple Watch models show improved accuracy, reflecting Apple’s ongoing efforts to refine their technology over time.

Doctoral student Ju-Pil Choe noted a trend of gradual improvements, although not every update results in significant leaps in performance. However, the analysis did reveal weaknesses in calorie tracking. The study reported an average error rate of 27.96% for energy expenditure estimates, which encompasses activities such as walking, running, cycling, and high-intensity workouts. This indicates that Apple Watch calorie estimates are comparable to those from other devices, like Fitbit Surge, which also struggle with calorie accuracy.

Factors like body weight, movement types, and metabolic efficiency complicate precise calorie measurement, leading devices to rely on generalized algorithms that are prone to inaccuracies. In summary, while Apple Watches are reliable for tracking heart rate and steps, users should view calorie burn estimates with skepticism. Smartwatches can serve as motivational tools for logging workouts and monitoring progress, but tuning into how your body feels can sometimes provide a more rewarding experience than focusing solely on statistics.

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