Components of heart rate variability have attracted considerable attention in psychology and
medicine and have become important dependent measures in psychophysiology and …

Electrocardiographic RR intervals fluctuate cyclically, modulated by ventilation, baroreflexes,
and other genetic and environmental factors that are mediated through the autonomic …

Background Although heart rate variability (HRV) is altered in a variety of pathological
conditions, the association of reduced HRV with risk for new cardiac events has not been …

Background—Survival of post–myocardial infarction patients is related inversely to their
levels of very-low-frequency (0.003 to 0.03 Hz) RR-interval variability. The physiological …

Cardiac innervation by the parasympathetic nervous system (PNS) and the sympathetic
nervous system (SNS) modulates the heart rate (HR)(chronotropic activity) and the …

The understanding of heart rate variability (HRV) has increased parallel with the
development of modern physiology. Discovered probably first in 1847 by Ludwig, clinical …

OBJECTIVES Estimate the effect of angiotensin converting enzyme (ACE) inhibitors on the
risk of sudden cardiac death (SCD) following myocardial infarction (MI). BACKGROUND …

Background Depression is associated with an increased risk for mortality after acute
myocardial infarction (MI). The purpose of this study was to determine whether low heart rate …

Low heart rate (HR) variability is a risk factor for cardiac mortality in various patient
populations, but it has not been well established whether patients with long-standing …

Heart rate variability (HRV) is the temporal beat‐to‐beat variation in successive RR intervals
on an electrocardiographic (ECG) recording and it reflects the regulation of the heart rate …