说明：  revolution in this industry is the use of green light reflection photoplethysmography (PPG) which can be measured with a watch worn on the wrist. With PPG, heart rate is detected through measurement of changes in blood volume using either transmission or reflection of specific wavelengths of light [4]. In this study, we investigated the usability of a readily available optical heart rate sensor fromthe fitness industry for heart ratemonitoring in amedical setting.We compared the performance of the optical heart rate sensor with that of