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The blood is red, which means it reflects the red light and absorbs the light of another color (usually the fitness tracker uses green light).
When the heart beats, the blood flow is stronger and so more green light is absorbed. Analyzing the reflected light, it is possible to calculate the heart rate.

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URL : https://en.wikipedia.org/wiki/Heart_rate

Blog ID : 225755

Category : Tutorials

Date Added : 9-10-2018

Tags : fitness tracker | heart rate

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