New research finds some models are better at faster speeds.
The researchers compared the heart rate readings given by the wrist monitors and Polar chest strap to those given by the ECG. The key finding: As the runners went faster, the wrist monitors became less accurate. At rest, the difference between the commercially available monitors and the ECG were small enough to be considered insignificant.
At all paces, the readings from the chest strap most closely matched those from the ECG. None of the wrist monitors were as accurate as the chest strap; at 8 mph and 9 mph, the difference between the wrist monitor and ECG readings increased. The Apple monitor was the most accurate of the wrist devices at all paces. For example, at 9 mph, the Apple monitor was off by 1.5 beats per minute, compared to almost 3 beats per minute for the Garmin. Adding to the potential uncertainty: On average at any speed, the Garmin used in this study underestimated heart rate by of 2 beats per minute, while the TomTom monitor overestimated heart rate by 6 beats per minute.
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