Dr. Alex Jimenez, El Paso's Chiropractor
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Don’t Bank on Heart-Rate Accuracy From Your Activity Tracker

(HealthDay News) — Wrist-worn activity trackers such as Fitbit don’t reliably assess heart rate, a new study finds.

While the devices may have some legitimate benefits, they shouldn’t be used for medical purposes, researchers suggest.

Evaluating four wearable activity trackers from Fitbit, Basis and Mio, the investigators compared results to those from an electrocardiograph (EKG). The researchers found results varied among the different models, and were much less accurate during exercise than at rest.

“These devices are probably good enough to inform consumers of general trends in their heart rate — high or low — [but] it’s important to have more accurate information when physicians are relying on this data to make decisions on medications or other tests and treatments,” said Dr. Mitesh Patel.

Patel is an assistant professor of medicine and health care management at the University of Pennsy

(HealthDay News) — Wrist-worn activity trackers such as Fitbit don’t reliably assess heart rate, a new study finds.

While the devices may have some legitimate benefits, they shouldn’t be used for medical purposes, researchers suggest.

Evaluating four wearable activity trackers from Fitbit, Basis and Mio, the investigators compared results to those from an electrocardiograph (EKG). The researchers found results varied among the different models, and were much less accurate during exercise than at rest.

“These devices are probably good enough to inform consumers of general trends in their heart rate — high or low — [but] it’s important to have more accurate information when physicians are relying on this data to make decisions on medications or other tests and treatments,” said Dr. Mitesh Patel.

Patel is an assistant professor of medicine and health care management at the University of Pennsylvania. He wasn’t involved in the study.

However, the study’s lead author cautions against making too much of the discrepancies.

“At any moment, the tracker could be off by a fair bit. But at most moments, it won’t be,” said Lisa Cadmus-Bertram, an assistant professor of kinesiology at the University of Wisconsin at Madison.

“The heart-rate feature performed better at rest,” she said. “They’re not as precise during exercise.”

A 2014 survey by PricewaterhouseCoopers found that 20 percent of American adults owned a wearable activity tracker.

For the new study, 40 healthy adults, aged 30 to 65, were recruited to test the Fitbit Surge, Fitbit Charge, Basis Peak and Mio Fuse.

Generally, when compared with the EKG results, the activity trackers were near the correct mark, Cadmus-Bertram said. But occasionally, their estimates of heart rate could swing too high or too low.

At rest, the Fitbit Surge was most accurate; Basis Peak was least accurate, the study authors said.

During exercise on a treadmill at 65 percent of maximum heart rate — defined as 220 beats per minute minus age — accuracy suffered more.

The monitors could overestimate heart rate by as much as 39 beats per minute (Fitbit Surge), or underestimate it by as much as 41 beats per minute (Fitbit Charge), the study found.

The findings support those of a study released last month at the American College of Cardiology annual meeting. Depending on the type of activity, the wrist devices were up to 34 beats per minute off, those researchers found.

Again, the devices were least accurate during exercise.

Some wrist-worn activity trackers use a light-emitting diode, or LED, that measures heart rate by detecting changes in the amount of blood in the skin.

Patel said accuracy may be a problem because the devices move around on the arm, especially during exercise.

Meanwhile, Fitbit’s maker said its fitness trackers aren’t intended to be medical devices. The company issued a statement in response to the new study.

“We conducted extensive internal studies which show that Fitbit’s PurePulse technology performs to industry standard expectations for optical heart rate on the wrist,” the statement said. Moreover, “Fitbit devices were tested against properly calibrated industry standard devices like an EKG chest strap across the most popular activities performed worldwide — including walking, running, biking, elliptical and more.”

Cadmus-Bertram cautioned that the data for the new study were collected about a year ago.

“Not only have newer models since been released, but the algorithms behind the data are presumably being updated and improved on a regular basis,” she said. “So the results we found might be different if we did the study again now.”

In general, she’s remains a fan.

“On the whole, fitness trackers still provide a tremendous amount of useful information to the average user who just wants some feedback to help them to increase their exercise level,” Cadmus-Bertram said.

The study findings were published online April 11 in the Annals of Internal Medicine.

SOURCES: Lisa Cadmus-Bertram, Ph.D., assistant professor, kinesiology, University of Wisconsin-Madison; Mitesh Patel, M.D., M.B.A., M.S., assistant professor, medicine and health care management, Perelman School of Medicine and the Wharton School, University of Pennsylvania, Philadelphia; Fitbit, statement, April 10, 2017; April 11, 2017, Annals of Internal Medicine, online

 

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    The information herein is not intended to replace a one-on-one relationship with a qualified health care professional, licensed physician, and is not medical advice. We encourage you to make your own health care decisions based on your research and partnership with a qualified health care professional. Our information scope is limited to chiropractic, musculoskeletal, physical medicines, wellness, sensitive health issues, functional medicine articles, topics, and discussions. We provide and present clinical collaboration with specialists from a wide array of disciplines. Each specialist is governed by their professional scope of practice and their jurisdiction of licensure. We use functional health & wellness protocols to treat and support care for the musculoskeletal system’s injuries or disorders. Our videos, posts, topics, subjects, and insights cover clinical matters, issues, and topics that relate and support, directly or indirectly, our clinical scope of practice.* Our office has made a reasonable attempt to provide supportive citations and has identified the relevant research study or studies supporting our posts. We provide copies of supporting research studies available to regulatory boards and the public upon request. We understand that we cover matters that require an additional explanation of how it may assist in a particular care plan or treatment protocol; therefore, to further discuss the subject matter above, please feel free to ask Dr. Alex Jimenez or contact us at 915-850-0900 Read More…

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