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Under resting conditions, the ECG of healthy individuals exhibits periodic variation in R-R intervals. Heart rate variability refers to the beat-to-beat alterations in heart rate. This term has become widely accepted though in practice, one usually measures the variation in the beat-to-beat interval rather than the variation in the instantaneous heart rate. Heart rate variability is a measure of variation in heart rate. Heart rate variabilityconcepts:
Heart rate variability systems
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