Scientists from the Cleveland Clinic in Ohio tested before the accuracy of sports watches: https://journals.lww.com/acsm-msse/Fulltext/2017/08000/Variable_Accuracy_of_Wearable_Heart_Rate_Monitors.22.aspx https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6732081/ They additionally wrote a paper about the “the Accuracy of Apple 4 for Detection of Atrial Fibrillation”: https://www.ahajournals.org/doi/full/10.1161/CIRCULATIONAHA.119.044126 But no new other papers about sports watch accuracy is available from the Cleveland Clinic in Ohio. Was it not worth …
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