The cardiorespiratory system exhibits oscillations from a range of sources. One of the most
studied oscillations is heart rate variability, which is thought to be beneficial and can serve …

Cardiovascular variabilities were recognized over 250 years ago, but only in the past 20
years has their apparent utility come to be appreciated. Technological advancement has …

Respiratory sinus arrhythmia (RSA) is heart rate variability in synchrony with respiration, by
which the RR interval on an ECG is shortened during inspiration and prolonged during …

Heart rate variability (HRV), the beat-to-beat variation in either heart rate or the duration of
the R–R interval–the heart period, has become a popular clinical and investigational tool …

Heart rate variability (HRV), the beat-to-beat variation in either heart rate or the duration of
the RR interval, has become a popular clinical and investigational tool (Task Force of the …

Heart rate variability (HRV) has been associated with various diseases and reflects
autonomic cardiac control sensitive to central nervous system function. Examples of the …

THE RHYTHM OF THE HEART has not only fascinated cardiologists but also inspired poets
and musicians. Indeed, the periodic beat of the heart was used to define the speed of music …

The respiratory component of heart rate variability (respiratory sinus arrhythmia, RSA) has
been associated with improved pulmonary gas exchange efficiency in humans via the …

Although it is doubtful whether the normal sinus rhythm can be described as low-
dimensional chaos, there is evidence for inherent nonlinear dynamics and determinism in …

Heart rate variability (HRV), the beat-to-beat alterations in heart rate, comprises sympathetic
and parasympathetic nerve activities of the heart. HRV analysis is used to quantify cardiac …