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Fitbits Detect Lasting Changes After Covid-19
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Fitbits Detect Lasting Changes After Covid-19

One in five Americans uses a Fitbit, Apple Watch, or another wearable fitness tracker, which continually collects data on heart rates, body temperature, physical activity, and more. Credit…Michele Tantussi/Reuters By Emily AnthesJuly 7, 2021 Last spring, when the nation’s Covid-19 cases were soaring and tests were in short supply, some scientists wondered whether a new approach...