When light is reflected off the flow of blood, it’s captured by the sensors. Most wearables have optical heart rate monitors, which use flashing LEDs to penetrate the skin and detect blood flow. What is ECG and why is it a useful feature to have on a smartwatch? We get into all of the key details below. The technology is designed to help people keep closer tabs on their heart health, and can even be used to help identify atrial fibrillation (Afib) a serious medical condition that is a leading cause of stroke.ĮCG was thrust into the wearable spotlight via the Apple Watch Series 4, but it can now be found on smartwatches from Samsung, Google, Fitbit and even Huawei and Garmin. ![]() ![]() Heart rate monitors are part and parcel of smartwatches and fitness trackers now, but electrocardiogram (ECG/EKG) is the new sensor in town.
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