Is the holy grail Polar H10 not overestimated as far as accuracy is concerned? We have all kind of studies about heart rate variability with the Polar H10: https://scholar.google.com/scholar?hl=de&as_sdt=0%2C5&q=polar+h10+heart+rate+monitor&btnG=&oq=polar+h10 But we have also a heart rate variability study about a Cyton 3 channel ECG device which is eventually more accurate than the Polar H10: https://www.sciencedirect.com/science/article/pii/S2405844021012512 …
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