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2. Apple Watch - Wikipedia

   en.wikipedia.org/wiki/Apple_Watch

   The back of all Apple Watches are equipped with a Heart Rate Monitor, which projects infrared and green light from light-emitting diodes (LEDs) onto the user's skin and photodiodes measure the varying amount of light reflected. Because blood absorbs green light and reflects red light, the amounts of each type of reflected light are compared to ...

3. Fitness tracker - Wikipedia

   en.wikipedia.org/wiki/Fitness_tracker

   An Apple Watch showing the numbers that track a typical run. A fitbit watch showing conditions for a workout A Garmin watch tracking activity and health data. Many devices primarily intended as smartwatches also function as fitness trackers. An early example was the Apple Watch, which has offered fitness tracker functions since 2014. [15]

4. 8 Best Heart Rate Monitors, Tested by Our Fitness Editors - AOL

   www.aol.com/10-best-heart-rate-monitors...

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5. Heart rate monitor - Wikipedia

   en.wikipedia.org/wiki/Heart_rate_monitor

   A heart rate monitor (HRM) is a personal monitoring device that allows one to measure/display heart rate in real time or record the heart rate for later study. It is largely used to gather heart rate data while performing various types of physical exercise. Measuring electrical heart information is referred to as electrocardiography (ECG or EKG).

6. Woman shares results after Apple Watch tracks her heart rate ...

   www.aol.com/woman-shares-results-apple-watch...

   According to the Apple Watch data, her heart rate went up to 88 BPM due to an “intense gym session” earlier in the day. Their breakup conversation occurred at 4pm and lasted for about an hour ...

7. Pulse watch - Wikipedia

   en.wikipedia.org/wiki/Pulse_Watch

   Wearable technologies that monitor heart rate has interested users for a very long time. [14] In addition to the pulse watch which monitors heart rate from pulse detection at the wrist. There are also devices which use similar technologies to monitor heart rate from the ear, forearm and chest, using a chest strap. [2]