Individuals with COVID-19 took longer to return to their resting heart rate (RHR), sleep and activity baselines compared with symptomatic individuals who were COVID-19 negative. This difference was most marked for RHR, with COVID-19–positive individuals initially experiencing a transient bradycardia followed by a prolonged relative tachycardia that did not return to baseline, on average, until 79 days after symptom onset. A small subset of COVID-19–positive participants maintained an RHR more than 5 beats per minute greater than their baseline RHR that did not return to their normal for more than 133 days.
