![]() ![]() In order to attain the most accurate BPM data, these LEDs flash hundreds of times per second. When your heart beats, this flow, and by proxy the green light being absorbed, is greater. Therefore, by using green LEDs and pairing them with photodiodes, a device is able to detect the amount of blood flowing through the wrist. Photoplethysmography, as it's known, essentially works on this premise: blood is red because it reflects red light and absorbs green light. Read this: Activity and Workout explained How the optical Apple Watch heart rate monitor worksĪlmost every smartwatch harbouring a heart rate monitor makes use of the same technology, and all of the Apple Watch models follow suit. No longer just a way for you to get a look at the basics, such as your workout stats, calorie burn or active minutes, the latest Apple Watch models work to provide atrial fibrillation detection, low heart rate detection and details on heart rate rhythm.īut how does it all work, what data is presented on your wrist and on the iPhone, and just how accurate is the tracking itself? We've outlined the tech present in all Apple Watches and the data that they can provide about your heart.Īny questions about anything below? Let us know in the comments section. Read next: The best heart rate monitors right now After dipping into some basic heart health in previous versions, giving users a high heart rate notification and resting heart rate stats, the Series 4 unveiled medical-grade accuracy through ECG monitoring. Over time, the Apple Watch has grown into quite the everyday heart rate monitor, with the new Series 5 packing a host of features on this front.Īpple really got serious about heart health with the Apple Watch Series 4. ![]()
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