Heart rate variability: How it might indicate well-being
https://www.health.harvard.edu/blog/heart-rate-variability-new-way-track-well-2017112212789
WebApr 3, 2024 · HRV is simply a measure of the variation in time between each heartbeat. This variation is controlled by a primitive part of the nervous system called the autonomic nervous system (ANS). It works behind the scenes, automatically regulating our heart rate, blood pressure, breathing, and digestion among other key tasks.
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