The different wavelengths allow for interaction with various levels of skin and tissue. Some devices even utilize varied multiple wavelengths in consideration with the differences in skin tone, thickness, and morphology of its wearers. This is usually composed of at least two LEDs intended to send light waves unto the wearer’s skin. To enable the smartwatches and fitness trackers to monitor the wearer’s heart rate using the PPG technology, they must have the following components: 1. Components of PPG technology Heart rate monitoring smartwatches (Image: pearlsband) These devices are similar to the finger or ear clip devices that measure pulse and blood oxygen levels being used nowadays. Later on, around the 1980s, hospitals were introduced to the first pulse oximeters. This way, they were able to see the blood flow in their veins. What people of those days did was to hold their hands up near a candle in a dark room. The use of light to see the flow of blood and to monitor heart rate actually started in the late 1800s. If you are thinking that such a way of monitoring one’s heart rate is new, then you are mistaken. As such, each heartbeat allows for more green light absorption between heartbeats, there’s less absorption of the said green light. Mainly, the blood beneath the skin reflects the red light and absorbs green light. Optical heart rate monitoring utilizes these LED lights to determine how much red or green light is being detected from the skin of your wrist. īasically, smartwatches and fitness trackers that utilize PPG are characterized by the green and red lights that you may see at the back of their cases. For most brands, this is being done using the technology called Photoplethysmography (PPG). What smartwatches and fitness trackers do essentially is called Optical Heart Rate Monitoring. How Smartwatches & Fitness Trackers Measure Your Heart Rate: Optical Heart Rate Monitoring (OHRM) Smartwatch with heart rate monitoring (Image: Apichit) Which Smartwatch or Fitness Tracker Is Most Accurate in Monitoring Heart Rate?.How Smartwatches & Fitness Trackers Measure Your Heart Rate:.
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