How Do Fitness Trackers Measure Heart Rate? | Photoplethysmography Explained

How do fitness watches and smartwatches like the Apple Watch , Fitbit and Biostrap measure heart rate and heart rate variability?
How Smartwatches measure heart rate?
Why does Apple Watch and Fitbit have a green light on the back?
what are the green lights on the back of an apple watch ?

Please watch the full video, it’s a Heart Rate Monitor Review video.

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Fitness tracker like the Apple Watch, Fitbit and Biostrap measure heart rate ( heart rate monitor ) and other health data using a technology called Photoplethysmograhy or PPG.

Photoplethysmography works via an optical sensor in your watch that shoots either a red or green light onto the surface of your skin.

When this light reaches your blood vessels, some of this light is reflected back to a photodetector on your watch. The intensity of light reflected back captures a waveform of the amount of blood in your blood vessel.

Who Use What:
Apple Watch green light and
Fitbit blaze green light PPG
but Biostrap red light PPG to measure clinically accurate advanced biometrics like heart rate variability and oxygen saturation.

If you have any questions feel free to drop a comment below!

Dr. Yo
ECA Wellness

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How do a Smartwatch Work | Heart Rate Monitor Review | How Does Fitbit Work

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#Photoplethysmography
#HeartRateMonitor

Relevant Videos :

1. Biostrap Review : Best Fitness Tracker

2. What is VO2 Max ?

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How do a Smartwatch Work | Heart Rate Monitor Review | How Does Fitbit Work
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