Heart rate variability (HRV) is a measurement of the specific changes in time (or variability) between successive heart beats. This is related to autonomic and cardiovascular function
Malfliet, A; Pas, R; Brouns, R; De Win, J; Hatem, SM; Meeus, M; Ickmans, K; van Hooff, RJ; Nijs, J (2018), "Cerebral Blood Flow and Heart Rate Variability in Chronic Fatigue Syndrome: A Randomized Cross-Over Study", Pain Physician, 21 (1): E13-E24
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