What is Heart Rate Variability (HRV)?

Sharing exerts from original articles on HRV, published on Harvard University Health Blog (2017) and Oura website 2020.

What is HRV?

As popular as the metaphor may be, a healthy heart doesn’t beat as regularly as a metronome—it actually changes its rhythm with each beat. This constant variation in milliseconds between your heartbeats is known as your heart rate variability (HRV).

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 . . .

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