Last Updated on September 30, 2022 by pg@petergamma.org According to the paper of the Group of cardiologist Milind Y. Desai, Cleveland Clinic Ohio: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6732081/ with the exercise protocol: “In each subject, right and left wrist circumferences were measured using a tape measure to ensure that no wrist was too small for the watch strap. Wrist-worn … Continue reading 19.18 For runs on a treadmill at 4, 5, 6, 7, 8, and 9 mph at zero inclined, a 3 lead ECG is gold standard for HR measurement