Not all medical reports from your Smartwatch are reliable
Which features can we trust and which can we not?
Among all the medical functions, some are more reliable than others. The cardiologist considers that it is difficult for pace counters to fail. He values the pulse measurement as one of the "least bad" functions, that is, the measurement of oxygen in the blood, which works "reasonably well". The same system is used to determine resting heart rate.
The electrocardiogram is available on very few watches, but he assures that “it is quite accurate, although the patient probably won't know how to interpret it”.
On the other side of the scale, we find the tension measurements. “They use the formulas obtained from the concentration of oxygen in the blood to estimate blood pressure through some algorithm they have. That still needs a bit of refinement”, points out the specialist.
Another of the handicaps of these devices is found when we exercise. “The problem with watches that are not high-end (and there are letters in medical journals that certify this) is precisely that they are not very accurate with moderately high heart rates. At rest they work, but when you exercise they don't measure well at all.