"I've used an Apple Watch for years and have always found it a helpful and convenient device. I especially like the health-related features, most notably the heart rate monitor that can not only measure my current rate but keep track of my resting rate, walking rate, and a range over time. I don't always wear my watch around the house."
"This feature will work through a custom photoplethysmography (PPG) sensor that shines infrared light pulsed at 256 times per second to measure the absorption of light in your blood flow, according to Apple. In a nutshell, this means that the AirPods will shine light into the blood vessels in your ears. By detecting how much light is absorbed by your blood and how much is reflected back, the sensor can determine your heart rate."
An Apple Watch provides helpful and convenient health features, notably a heart rate monitor that measures current, resting, and walking rates and records ranges over time. Heart rate is automatically recorded when exercising or performing physical activity through the Workout app. The AirPods Pro 3 will add a built-in heart rate monitor that uses a custom photoplethysmography (PPG) sensor pulsing infrared light 256 times per second to measure blood absorption in ear vessels and determine heart rate. The AirPods monitor appears to activate only during workouts initiated from the Fitness app or compatible apps and cannot be manually started like the Apple Watch.
Read at ZDNET
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