There's a lot more to know about Apple Watch, and Apple is well versed in this. Today they updated the support page of the official website to let potential users learn more about how the heart rate monitor on the Apple Watch works.
Apple said the heart rate monitor used on the Apple Watch is called "photoplethysmography" (optical plethysmography), but it's based on a very simple technique, so you don't need to understand this complex term.
The blood is red because it reflects red light and absorbs green light. Apple Watch uses green LED lights and photodiodes to monitor the blood levels flowing through your wrist at any important moment. When your heart is beating, blood flows through your wrist and the green light absorbs. Blood flow will be less between every two heartbeats. By blinking LEDs hundreds of times per second, Apple Watch can count the number of heartbeats per minute - your heart rate.
In addition to green LED lights, Apple can also use infrared light to track the wearer's heart rate. In fact, infrared light is the primary measure used by Apple Watch to measure the wearer's heart rate, measured every 10 minutes. Only when the infrared system is unable to obtain an appropriate reading will the system switch to a green LED for monitoring.
In addition to explaining the technology, Apple also offers potential customers advice on how to get better monitoring data. The first is that the watch should fit your wrist and not be too loose. In addition, the heart rate monitor's readings are also dependent on the external temperature and the exercise activity being performed by the wearer.
Most Android Wear smart watches on the market are difficult to work properly during exercise, so whether the heart rate monitor on the Apple Watch is powerful is also worth looking forward to.
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