![]() ![]() ![]() The study recruited over 400,000 participants over an 8-month period to investigate the watch's irregular heart rhythm notification. The Apple Watch heart rate monitor may be accurate in certain casesĮarly Apple Watch models (Series 1, 2, and 3) rely on LED lights that detect the flow of blood through your arteries, according to Matthew Martinez, MD, FACC, a cardiologist and chair of the American College of Cardiology Sports and Exercise Council.Īpple explains further on its support page: "By flashing its LED lights hundreds of times per second, Apple Watch can calculate the number of times the heart beats each minute - your heart rate."Īccording to a 2019 study in The New England Journal of Medicine, the Apple Watch can be accurate for detecting atrial fibrillation, or an irregular heartbeat.
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