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Hello dbk42, thanks for asking! Please follow this link (https://www.samsung.com/us/support/answer/ANS00083511/) to an article that will help you learn more about monitoring your heart rate. ^Elizabeth
Sorry, there was a problem. Please try again later.The watch will give you a notice if it detects that your heart rate is higher or lower than it should be. It is not perfect and if you get a notice you should check it with a better device. It does track it pretty good I go to Dialysis and have a blood pressure cuff put on during this and it also tracks my heart rate and the watch and cuff have always been within a couple beats.
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