Introduction Heart rate variability (HRV) is the measure of oscillations of the cardiac R‐R
interval and is a non‐invasive indicator of cardiac autonomic function. HRV is commonly …

Without heart beat there would not be human life. Without heart rate variability (HRV) life
would be shorter. Throughout the history of medicine, there has been an interest in heart …

Many studies have been conducted on heart rate variability. Variability in the heart signal of
two sequential beats is called heart rate variability (HRV). Short-and long-term variability …

Measurement of heart rate variability (HRV) by spectral analysis has become a hot issue in
cardiology in recent years. Originally this technique was promoted by well-known clinicians …

This study was designed to validate the measures of heart period variability for assessing of
autonomic nervous system control in calves. Eight calves received an injection of either 0.5 …

Objective: To obtain data relating to the reproducibility of the time and frequency domain
measurements obtained from 10-min ECG recordings. Methods: Eighteen normal volunteers …

Heart rate variability (HRV) has proven to be a useful tool for studies of autonomic control
and its central integration. Technical and analytical developments continue to advance the …

During the past decade, heart rate variability (HRV)(ie, the degree of sinus arrhythmia) has
attracted increasing interest as a noninvasive index of parasympathetic activity and a …

Heart rate variability (HRV) came into existence by observations of Hon and Lee in 1965
and since then has been a subject of prime importance in medical research. It is derived …

Several devices based on ECG can acquire beat-to-beat intervals, and some of these
devices may be used for heart rate variability (HRV) analysis. Most of these devices and …