Postural-induced phase shift of respiratory sinus arrhythmia and blood pressure variations: insight from respiratory-phase domain analysis

摘要

The respiratory phase dependence of hemodynamics and the resultant reflex control of the cardiovascular system are, however, much more complicated than those considered in the study by Saul et al. (21). For example, the effect of cardiac filling caused by a decrease in the intrathoracic pressure, through the Frank-Starling mechanism, influences systolic BP (SBP), while the windkessel BP reduction process, altered by the length of interbeat intervals, affects diastolic BP (DBP). Therefore, a more detailed description of the relationships between respiration, HR, and hemodynamic fluctuations, including those of SBP and DBP, is needed to elucidate the dynamic mechanisms of RSA.