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
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 +
rate-pressure product
Rate-pressure product is defined as the product of the heart rate (the number of contractions of the cardiac ventricles per unit of time) (beats per minute) and mean arterial blood pressure (the average force the blood exerts on an artery wall) (mm Hg).