The issue affects all Apple Watch models and does not depend on the type of physical activity.
Scientists from the University of Mississippi have found that the Apple Watch accurately measures heart rate and steps but makes serious errors when calculating calories burned. The error reaches almost 30%, making this indicator unreliable for accurately recording energy expenditure.
What is known
Apple’s watch remains one of the most popular fitness trackers, but its calorie data should be taken with caution. Researchers analyzed 56 scientific papers and found that the error rate for heart rate was only 4.43%, and for step counting, 8.17%. These figures are in line with consumer device standards.
However, when estimating calories burned, the error increases to 27.96%, which significantly exceeds permissible norms. Moreover, the problem is relevant for all Apple Watch models and does not depend on the type of physical activity.
Wearables are a great tool for motivation, but their data should not be considered completely accurate. They are better used as a guide, not as medical indicators, emphasized Eric Schaeffer, one of the study’s authors.
Previously, other independent studies have made similar conclusions, pointing to a systemic problem in fitness trackers. At the same time, experts note that the accuracy of devices is increasing every year. Apple continues to improve algorithms, adding new features such as body temperature monitoring and sleep apnea detection.
Scientists emphasize that their goal is not to discredit gadgets but to show their current limitations.
Such research helps developers improve technologies, making devices more useful for both users and doctors, explained Jennifer Ross, co-author of the work.
Despite its inaccuracies, the Apple Watch remains a useful health tracking tool, but its calorie data should be considered an estimate.
Read also our article about how Apple is developing technology to control Apple gadgets with the power of thought.