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Pedestrian,
when I download my Polar HRM to the computer, I can look at the raw data, and for *any* given minute I can count up how many HR readings it recorded from my heart, so it's just a case of checking my watch for the exact time, lying down, then looking out the raw data feed on the computer that records *every beat*.
You are right though, it displays a sample of the previous 5 heart beats so it's showing you a rolling average, but the raw data is there.
Interestingly, if an endurance athelete goes to the hospital, they will tell you that your are suffering or have recently suffered a heart attack or have a heart blockage; x-rays will reveal an enlarged heart, bloods will show increased muscle enzymes, ECG reveals ventricular hypertrophy and you are showing bradycardia!!
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