That’s exactly what Fitbit recommends in its manual. It’s important to note that our active heart rate readings were conducted while our subject was sitting still, a few seconds after completing rigorous exercise. Our data showed that the Blaze was off by just one to two beats per minute for both resting and active heart rate. Here at, we happen to have the Fitbit Blaze on-hand, and we recently conducted our own test of its heart rate sensor using a surgical-grade pulse oximeter. That’s from the Fitbit Charge HR manual, and the Surge and Blaze manuals include nearly verbatim versions of the same statement. Try relaxing your wrist and staying still briefly (about 10 seconds), after which you should see an improved heart rate reading. Similarly, with exercises such as weight lifting or rowing, your wrist muscles may flex in such a way that the band tightens and loosens during exercise. With high-intensity interval training or other activities where your wrist is moving vigorously and non-rhythmically, the movement may prevent the sensor from finding an accurate heart rate. The study compared generated electrocardiogram readings against readings from the PurePulse heart rate sensors in Fitbit’s Charge HR and Surge trackers, and found that they can be off by up to 20 beats per minute during rigorous exercise.ĭespite these findings, the suit could still face an uphill battle since Fitbit's product manuals for the Charge HR, Surge, and Blaze explicitly warn of these inaccuracies: ![]() On the surface, the researchers’ methodology seems sound. ![]() Best-right-now The Best Bathroom Scales of 2022
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