Undoubtedly the Apple Watch is getting a good handful of praise since its launch and is that It is not the first time that the precision of the Apple device has been mentioned when measuring the heart rate of the wearer. In this sense, the best thing is that Apple continues to improve its sensors and in the future it would touch perfection in these measurements if it does not already do so ...
97% of the times that the watch detects an abnormality in the user's heart rate, it is correct. This is a really good precision for a watch that has 3 years of life in this market saturated with health-related products, but Apple usually does things well and in this sense It is important to know that the precision of the device is really reliable when it measures our pulse.
In this case, the study is published by the medium Jama Network, and in this, this correctness of the clock is confirmed in cases where the heart is triggered in an "unexpected" way. The sensor itself is helped by the watchOS 4 system, which is capable of giving information about your heart rate at rest, when you are active and globally throughout the day. In this sense, when there is an abnormal activity in our heart rhythm (especially while we are at rest) the clock warns us and It is precisely in this measurement that the study certifies the success of the Apple watch.
Really in this field of health with HealthKit At the forefront, great progress is being made, but it is necessary to continue perfecting and improving this type of sensors and software so that this high percentage of success in measurements increases. In any case, the error in the measurements can occur for many reasons, but the main one is not having the watch or the like correctly positioned, since the measurement technology used is really reliable as demonstrated in these studies.