In the so-called overtraining syndrome, contrary to popular scientific publications, the heart rate is usually unchanged at rest. In the maximum range, however, the heart rate is slightly reduced (approx. 3-5 bpm).42Heart rate variability (HRV), on the other hand, seems to be a suitable ...
At an in-person checkup, the doctor or nurse usually puts a pulse oximeter on your finger to measure blood oxygen levels (SpO2) which can be a sign of COVID-19 as well as other respiratory issues, but you can buy your own pulse oximeter like theZacurate 500BLfor as little as $15. ...