1. Adapt the protocol of this paper: Accuracy of commercially available heart rate monitors in athletes: a prospective study https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6732081/ Address for correspondence: Milind Y. Desai, M.D., Department of Cardiovascular Medicine, Cleveland Clinic/Desk J1-5, Cleveland, OH 44195 – if possible, associate with a cardiologists, which has an excellent ECG device and knows how to handle …