To log a reading, the watch's built-in optical heart sensor shines red and green LED light and infrared light onto your wrist to measure the amount of light reflected back. When used, it's able to measure the oxygen saturation of your blood in roughly 15 seconds. One of the more impressive features the Apple Watch offers is its blood oxygen sensor. The blood oxygen saturation feature can help give you an idea of how much oxygen you have circulating in your blood. After the reading, the watch tells you if you show signs of irregularity.ĭesai says studies haven't agreed on this app's accuracy, but the data is solid info in his opinion that he still instructs his patients to use this feature in order to monitor heart murmurs or atrial fibrillation (Afib or AF). To use the functionality, open the ECG app on your watch and hold your finger on the crown for 30 seconds while resting your arm on your lap or a table. According to the Mayo Clinic, the app records cardiac electrical signals, which can detect heart problems like irregular rhythms.Īlthough the Apple Watch can't tell you your arteries are clogged or you have a heart attack, the ECG app's data can give doctors a clearer picture of what might be going on if you're experiencing certain symptoms like chest pain or tightening, shortness of breath, palpitations, or dizziness and lightheadedness. The Apple Watch's electrocardiogram (ECG) app is one of the most influential features it offers. You have to make sure the ECG feature is installed via the Health app in order to take a reading. How variable your resting heart rate is can also indicate stress levels, since your heart rate tends to spike when you're stressed. This precision makes the Apple Watch deal for anyone who wants to see how hard they're working while exercising and can also provide information on other important health aspects, such as sleep disorders or irregular heartbeats.įor instance, Desai says that "a spiking heart rate during sleep can sometimes indicate sleep apnea where someone stops breathing due to airway obstruction or brainstem respiratory drive." When tested against an EKG machine (which is what you'd find at a doctor's office and nearly 100% accurate), the Apple Watch measured roughly 91% accuracy. your heart rate).Īlthough the Apple Watch's heart rate monitor shouldn't be considered medical grade, it is more accurate than similar fitness trackers with wrist-based tracking. This allows it to chart how many times the heart beats per minute (i.e. By flashing those lights hundreds of times per second on a wearer's wrist, the watch can track the flow of blood through your arteries. It manages this via built-in photodiodes (light sensing photo sensors) which detect a series of flashing green LED lights. The heart rate monitor built into the Apple Watch is one of the most accurate you'll find in any fitness tracker or smartwatch. An Apple Watch can take an instant heart rate reading and charts your heartbeat throughout the day.
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