https://theconversation.com/heart-rate-variability-what-to-know-about-this-biometric-most-fitness-trackers-measure-194898
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12/26/22 at 8:52pm
Organization
The Conversation Africa
Author
Anne R. Crecelius
Tiny fluctuations in the time between each beat of your heart can provide clues about how much stress your body is experiencing.
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