![]() ![]() HRV has been shown to be reduced in individuals reporting to worry more. High-frequency (HF) activity has been found to decrease under conditions of acute time pressure and emotional strain and elevated anxiety state, presumably related to focused attention and motor inhibition. For example, HRV is related to emotional arousal. There is interest in HRV in the field of psychophysiology. ![]() Psychological and social aspects Ī simplified representation of the neurovisceral integration model Ī range of other outcomes and conditions may also be associated with modified (usually lower) HRV, including congestive heart failure, diabetic neuropathy, post– cardiac-transplant depression, susceptibility to SIDS and poor survival in premature babies, as well as fatigue severity in chronic fatigue syndrome. Reduced HRV has been shown to be a predictor of mortality after myocardial infarction although others have shown that the information in HRV relevant to acute myocardial infarction survival is fully contained in the mean heart rate. ECG is considered the gold standard for HRV measurement because it provides a direct reflection of cardiac electric activity. Methods used to detect beats include ECG, blood pressure,Īnd the pulse wave signal derived from a photoplethysmograph (PPG). 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". It is measured by the variation in the beat-to-beat interval. Heart rate variability ( HRV) is the physiological phenomenon of variation in the time interval between heartbeats. Electrocardiogram (ECG) recording of a canine heart that illustrates beat-to-beat variability in R–R interval (top) and heart rate (bottom).
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