According to this paper: Lin LI. A concordance correlation coefficient to evaluate reproducibility. Biometrics 1989;45:255-68. 10.2307/2532051 https://pubmed.ncbi.nlm.nih.gov/2720055/ which has been cited 8231 times to this date, the requirements for gold standard for HR measurement are: The OpenBCI Cyton is a 3 lead ECG device, the Polar H10 is only a single lead ECG device and …
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