I've found that occasionally, the Heart Rate app on the watch logs a data point as unrealistically low or high. For example, I might jog in place for a minute or two, which should bring my heart rate to just over 100 beats per minute. While it might record that over time, it might also log a single, outlying data point at around, say, 160, 180 or 200. I've hypothesized that the logic is just making a wrong guess: it might be reading my pulse at 80 beats per minute while it increases, has neither enough confidence not to discard the reading nor enough to be certain it's 80, notes using motion detection that I'm engaged in brisker activity, and decides it could be missing every second beat and concludes my pulse is twice as fast. Typically those factors give an accurate reading, but once in a while, that sort of thing happens.
There's no way those readings are correct: I can check my pulse when this happens – and I have experienced occasional ectopic heartbeats and brief accelerated palpitations in my life, which I did raise to my doctor – so I know what those feel like when they do happen.
Naturally, I can't advise you to dismiss your own watch's readings out of hand; we're clearly different ages and might have very different states of health, so I certainly would not be afraid to ask your own doctor about that, even if it's just "my watch has given these readings; could they be correct?" It's never wrong to try to get insight about the state of your health – that's one of the points of the watch, after all. Meanwhile, does the watch provide perfect readings every single time? It's miles beyond anything we've had before, but no.
