I don't have experience with the Apple watch, but I would tend to disregard an infrequent transient reading in the 40's as I'm sure the watch occasionally doesn't sense a beat. You could wear a Holter Monitor for 24-48 hours for accuracy if you still have concerns.
Answered 6/12/2022
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Most likely an error with the watch. I would look at the data from Apple as to how often this occurs with their device. .
Answered 6/12/2022
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