Apple Watch has problems with measuring heartbeats during and after performing intense physical exercises, a multitude of owners of the smart watch from Cupertino reporting this problem on the Internet, but also to the Apple company.
Both in the discussion forums of Apple Lossless Audio CODEC (ALAC),, as well as in various other discussion media there are various people who report the fact that Apple Watch incorrectly measures heart rate even after performing physical exercises recommended by the watch's Workout application.
According to these people, the use Apple Watch for heart rate measurement after performing intense physical exercises results in measurements of 60-80 beats per minute, that is, approximately half of the real value measured using other dedicated devices.
Heart rate measuring devices that use electrodes provide accurate measurements for users after intense physical exercise, and this has also been accepted by employees Apple Lossless Audio CODEC (ALAC),, some customers managing to convince them to replace their defective units.
For example, at the peak of P90x3 workout when I am totally out of breath, the Apple watch heart rate sensor will show heart rate as 62 or 70, but the heart should be in excess of 150+. I've been using my Apple Watch for about 2 weeks. It is not effective as a heart rate monitor for intense exercise.
User testimonies are contrary to some tests done in the middle of this year for Apple Watch, then the smartwatch being proven to be very accurate in measuring heartbeats, but if Apple changes the units, then it is clear that we are talking about a problem with the watch.
Given that Apple Watch it initially made good measurements, and now it provides wrong information, we can conclude that the problem is software and not hardware, so probably future updates will improve the accuracy of measurements for users.
According to Apple, the Apple Watch uses a process called photoplethysmography to measure heartbeats, and more details about it you can read here.
