absolute change in electrocardiographic low frequency R-R spectral component to high frequency R-R spectral component ratio
absolute change in heart rate
change in heart rate to change in intracerebroventricular sodium concentration ratio
A calculated measurement of the ratio between the change in heart rate and the concentration of sodium infused directly into the ventricle(s) of the brain; calculated as the slope of the curve of heart rate versus intracerebroventricular-infused sodium concentration.
change in heart rate to change in mean arterial blood pressure ratio +
change in heart rate to change in vasoactive chemical dose ratio
heart rate variability
percent change in heart rate
range of heart rate variation during variation of mean arterial blood pressure +