Fitbits Detect Lasting Changes After COVID-19

Jeff Williams, chief operating officer of Apple, talks about the electrocardiogram features on the Apple Watch Series 4, at the Steve Jobs Theater in Cupertino, Calif., Sept. 12, 2018.

In a paper published Wednesday in the journal JAMA Network Open, researchers studying Fitbit data reported that people who tested positive for COVID-19 displayed behavioral and physiological changes, including an elevated heart rate, that could last for weeks or months. These symptoms lasted longer in people with COVID than in those with other respiratory illnesses, the scientists found.

Participants downloaded the MyDataHelps research app and agreed to share data from their Fitbit, Apple Watch or other wearable device. They also used the app to report illness symptoms and the results of any COVID-19 tests.In October, the same researchers reported in Nature Medicine that when they combined wearable data with self-reported symptoms, they could detect COVID-19 cases more accurately than when they analyzed symptoms alone.

Participants in both groups slept more and walked less after they got sick, and their resting heart rates rose. But these changes were more pronounced in people with COVID-19. “There was a much larger change in resting heart rate for individuals who had COVID compared to other viral infections,” said Jennifer Radin, a public health researcher at Scripps who leads the DETECT trial. “We also have a much more drastic change in steps and sleep.

“Lots of people who get COVID end up getting autonomic dysfunction and a kind of ongoing inflammation, and this may adversely affect their body’s ability to regulate their pulse,” Radin said. These participants were also significantly more likely to report having had a cough, shortness of breath and body aches during the acute phase of their illness than did other COVID patients.

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