Parasympathetic autonomic function monitoring

A noninvasive parasympathetic autonomic function monitoring system was developed. Nine healthy adults were recruited. ARX model was used to precisely separate the effect of respiration and systolic blood pressure to heart rate variability (HRV). The respiratory sinus arrhythmia (RSA) impulse response magnitude, the parasympathetic autonomic function index, was estimated during supine and standing conditions. We found the RSA impulse response magnitude during supine and standing, orthostatic stress, are significantly different (P<;0.05). Therefore, it is possible that our measurement system can be used as a parasympathetic autonomic function monitoring system.