Heart-Rate Monitor Wrist Bands Often Inaccurate

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Watch-like wristbands that monitor heart rate may not offer true readings during exercise, a small study finds.
Researchers at the Cleveland Clinic's Heart and Vascular Institute tested four different wrist-worn heart rate monitors.
"All worked pretty well at rest," said Dr. Marc Gillinov, the Cleveland Clinic cardiac surgeon who led the experiment. "But as people exercised, the accuracy diminished."
None of the four devices achieved the accuracy of a chest strap monitor. In treadmill tests, the Apple Watch and Mio Fuse were the most accurate.
The other two devices fell short: Basis Peak, which is no longer being manufactured, overestimated heart rate during moderate exercise, and Fitbit Charge HR underestimated heart rate during more vigorous exercise, the study found.
Intel Corp. issued a safety recall last summer due to incidents of the Basis Peak overheating, causing burns or blisters on the skin. Intel and its Basis Science Inc. unit urge people to stop using the device and return it for a full refund.
In a statement, Fitbit defended its "PurePulse" technology, saying it performs to industry standards for wrist-based optical heart rate monitors, with an average absolute error of less than 6 beats per minute (bpm) and an average error of less than 6 percent.
"Fitbit devices were tested against properly calibrated industry devices like an EKG chest strap across the most popular activities performed worldwide, including walking, running, biking, elliptical and more," the company said.
I have to side with FitBit on this issue. These devices were never meant to be medical devices. Doctors that have patients with heart problems and have been told to exercise should be recommending chest trap monitors if they think that's best.
The wristband monitors are made for athletes to use.
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