A PLOS ONE paper concluded, that the Polar OH1 can be used instead of an ECG: https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0217288 but used as strange protocol for it: The used a very expensive ECG device or more than 50 000 USD. The institute who did the tests is not a sports institute. Why does it then sports sensor testing? …
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