At present, there are three main methods for monitoring heart rate: ECG, arterial blood pressure, and photoelectric method.
At present, the Gavo smart bracelet or watch uses the photoelectric method to detect the heart rate. Simply put, the sensor that touches the skin and the skin emits a beam of light on the skin (measuring reflected/transmitted light) because the blood absorbs light of a specific wavelength, and each time the heart pumps blood, the wavelength will It is absorbed a lot, and the heartbeat is determined by this.
As for accuracy, our usual movements, postures, and even skin colors all have an effect on the heart rate measurement of photoelectric methods. Therefore, the heart rate measured by most wristbands and watches is basically not completely accurate.
However, the current sports bracelet on the market, the function of measuring heart rate has been debugged quite accurately. For most devices, their error rate is less than 5%, which basically reflects the trend of heart rate, which is enough for normal exercise heart rate monitoring.