Manufacturers may test the accuracy of activity devices extensively, said Ashley, but it’s hard for consumers to know how accurate such information is or the process that the manufacturers used in testing the devices. Hard for consumers to know device accuracy Lead authorship is shared by graduate student Anna Shcherbina, visiting assistant professor Mikael Mattsson, PhD, and senior research scientist Daryl Waggott. But consumer devices aren’t held to the same standards as medical-grade devices, and it’s hard for doctors to know what to make of heart-rate data and other data from a patient’s wearable device, he said.Ī paper reporting the researchers’ findings was published online May 24 in the Journal of Personalized Medicine. “People are basing life decisions on the data provided by these devices,” said Euan Ashley, DPhil, FRCP, professor of cardiovascular medicine, of genetics and of biomedical data science at Stanford. And the least accurate was off by 93 percent. Even the most accurate device was off by an average of 27 percent. In contrast, none of the seven devices measured energy expenditure accurately, the study found.
BEST WATCH FOR CALORIES BURNED SKIN
Some devices were more accurate than others, and factors such as skin color and body mass index affected the measurements.
The team evaluated the Apple Watch, Basis Peak, Fitbit Surge, Microsoft Band, Mio Alpha 2, PulseOn and the Samsung Gear S2.
But if it's measuring energy expenditure, it’s probably off by a significant amount.Īn evaluation of seven devices in a diverse group of 60 volunteers showed that six of the devices measured heart rate with an error rate of less than 5 percent. Such people can take heart in knowing that if the device is measuring heart rate, it’s probably doing a good job, a team of researchers at the Stanford University School of Medicine reports. Millions of people wear some kind of wristband activity tracker and use the device to monitor their own exercise and health, often sharing the data with their physician.
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