Heart rate variability (HRV) reflects the balance of the autonomic nervous system (ANS).
There are two key HRV parameters: high frequency (HF), which is correlated with the …

Objective—To determine characteristics of power spectral analysis of heart rate variability
(HRV) during a 24-hour period in dogs and to evaluate the effects of vagal and sympathetic …

Heart rate variability (HRV), usually performed from 24 hour ambulatory ECG recordings,
measures the variability of the heart rate. Alterations in autonomic balance and baroreceptor …

Several studies have been performed to assess heart rate variability (HRV) in several
species such as humans, dogs, pigs, calves, rabbits and rats. However, haemodynamic …

Background: The modulation of heart rate by autonomic nervous system may be evaluated
by the heart rate variability (HRV), which illustrates the fluctuations between RR intervals. To …

Heart rate variability (HRV) is a numerical means of describing the oscillations in the heart
rate or R‐R interval between consecutive heart beats. Fluctuation in heart rate is a …

An experimental setting and software were developed to evaluate cardiac autonomic
function in unrestrained rats. Subcutaneously implanted ECG electrodes and an indwelling …

It is well-known that the autonomic nervous system plays an important role in the regulation
of activities of the heart. The assessment of autonomic function has been a challenging …

Analysis of heart rate variability is a valuable method to investigate the sympathetic and
parasympathetic function of the autonomic nervous system. Although such analyses can …

Heart rate variability (HRV) has become a popular method for the studies of physiologic
mechanisms responsible for the control of heart rate fluctuations, in which the autonomic …