I have pulse oximeter (for sleep apnea), and was using during the day. I noticed when I am resting my HR isn't constant, it fluctuates from moment to moment. Right now it is fluctuating around 60BMP, one moment it is 63 then few seconds later it is 58, then 62, then 60, then 57, then 55 , then 59 , then 63 BMP, then 65 BP, then down again, and up again. It changes every second or two. It isn't stable.
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