A substantial portion of sinus arrhythmia in conscious humans appears to be caused by the
CO2-dependent central respiratory rhythm. Under some circumstances, therefore, sinus …

Three algorithms for assessment of respiratory sinus arrhythmia (RSA) have been
evaluated: cross-correlation function, histogram analysis and regression plot. The algorithms …

1. Respiratory modulation of cardiac parasympathetic activity and the relationship between
respiratory sinus arrhythmia and parasympathetic control has been studied in twenty‐nine …

Respiratory sinus arrhythmia (RSA) is an index of cardiovagal regulation, emotional and
cognitive processing. RSA is quantified using heart rate variability (HRV) spectral analysis at …

The question of whether respiratory sinus arrhythmia (RSA) originates mainly from a central
coupling between respiration and heart rate, or from baroreflex mechanisms, is a subject of …

Previous studies have found that respiratory variations of ventricular response in atrial
fibrillation are infrequent and inconsistent. This asynchrony between heart rate and …

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

Patients with sleep apnea may experience two types of apnea, central and obstructive. We
compared cardiovascular effects of these two types of apnea matched for changes in arterial …

It has been long recognized that the period of the heart, that is, the interval between two
heartbeats, changes in rhythm with respiration. Change in heart periods that is synchronous …

Respiratory sinus arrhythmia (RSA) has been widely used as a measure of the cardiac vagal
control in response to stress. However, RSA seems not to be a generalized indicator …