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running characteristics - translation to russian
.svg?width=200 "Heart rate variability visualized with R-R interval changes")
.jpg?width=200)
![Maximum human speed [km/h] and pace [min/km] per distance](https://commons.wikimedia.org/wiki/Special:FilePath/Human speed distance portrait.png?width=200 "Maximum human speed [km/h] and pace [min/km] per distance")
![A scene depicting long-distance runners, originally found on a [[Panathenaic amphora]] from Ancient Greece, circa 333 BCE](https://commons.wikimedia.org/wiki/Special:FilePath/Long Distance Runners, Ancient Greece, Amphora.png?width=200 "A scene depicting long-distance runners, originally found on a [[Panathenaic amphora]] from Ancient Greece, circa 333 BCE")
![[[Eadweard Muybridge]] photo sequence](https://commons.wikimedia.org/wiki/Special:FilePath/Muybridge runner.jpg?width=200 "[[Eadweard Muybridge]] photo sequence")
![Roman bronze sculptures]] of runners from the [[Villa of the Papyri]] at [[Herculaneum]], now in the [[Naples National Archaeological Museum]]](https://commons.wikimedia.org/wiki/Special:FilePath/Runners MAN Napoli Inv5626-7 n02.jpg?width=200 "Roman bronze sculptures]] of runners from the [[Villa of the Papyri]] at [[Herculaneum]], now in the [[Naples National Archaeological Museum]]")
![International-level women athletes competing in 100 m sprint race at [[ISTAF Berlin]], 2006](https://commons.wikimedia.org/wiki/Special:FilePath/Sina Schielke (192) wins the 100 metres race - ISTAF 2006 - Berlin, 3 September.jpg?width=200 "International-level women athletes competing in 100 m sprint race at [[ISTAF Berlin]], 2006")
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Wikipedia
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.
Other terms used include "cycle length variability", "R–R variability" (where R is a point corresponding to the peak of the QRS complex of the ECG wave; and RR is the interval between successive Rs), and "heart period variability".
Methods used to detect beats include ECG, blood pressure, ballistocardiograms, and the pulse wave signal derived from a photoplethysmograph (PPG). ECG is considered the gold standard for HRV measurement because it provides a direct reflection of cardiac electric activity.
