Normally, at rest, the amplitude of respiratory sinus arrhythmia (RSA) appears to correlate
with cardiac vagal tone. However, recent studies showed that, under stress, RSA dissociates …

A hypothesis is presented that explains the physiological reasons why the magnitude of
respiratory sinus arrhythmia (RSA) appears to correlate with cardiac vagal tone. The …

Purpose: Hypercapnia increases minute ventilation (V'E) with little effect on heart rate (HR),
whereas hypoxia may increase HR without affecting V'E. However, the effects of …

Respiratory sinus arrhythmia (RSA) is the beat-to-beat fluctuation in heart rate at the
frequency of the respiratory cycle. While it is common to study RSA under conditions of …

Respiratory sinus arrhythmia (RSA) may serve an inherent function in optimizing pulmonary
gas exchange efficiency via clustering and scattering of heart beats during the inspiratory …

Respiratory sinus arrhythmia (RSA) is used as a noninvasive measure of vagal cardiac
input, but its causative mechanisms in humans remain undetermined. We compared the …

Background The primary mechanisms of respiratory sinus arrhythmia (RSA) are understood
to be the modulation of cardiac vagal efferent activity by the central respiratory drive and the …

Respiratory sinus arrhythmia (RSA), the increase and decrease in instantaneous heart rate
(HR) with inspiration and expiration, is commonly evaluated as function of breathing …

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 …

Publisher Summary At rest, the heart rate increases on inspiration and decreases on
expiration. This oscillation in heart rate is called the respiratory sinus arrhythmia (RSA). A …