Heart rate variability

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Notion

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Science and technology

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What Wikipedia says

Heart rate variability (HRV) is the physiological phenomenon of variation in the time interval between heartbeats. It is measured by the variation in the beat-to-beat interval.

Excerpt from the Wikipedia article “Heart rate variability”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Erdé51, CC0, via Wikimedia Commons.