Effects of posture change on heart rate variability in young healthy human.

吞咽困难的患者逐渐增加，然而，对进食时的安全性和舒适的头部和身体位置知之甚少。吞咽困难可能与许多医疗条件有关。为探讨自主神经系统在吞咽障碍患者中的作用，对10名19-25岁健康男性大学生进行了仰卧位和坐位（仰卧位90 °）下的心电图和血压的连续监测。对平稳R-R间期进行频域分析，以量化心率变异性（HRV）的高频（HF）、低频（LF）与高频（HF）比值（LF/HF）。从仰卧位到坐位，收缩压（SBP）显著降低，舒张压（DBP）、心率（HR）和LF/HF（交感神经活性）显著增加。HF（副交感神经活动）等参数无显著变化。坐位卧床45 °时也有类似的变化，我们将同时测量舌骨上肌肌电图和自主神经功能。深入了解这种影响可能会导致对吞咽困难患者的安全性和舒适姿势的理解。

Patients with dysphagia were gradually increased, however, little is known of safety and comfortable head and body position while eating. Dysphagia may be associated many medical conditions. It is caused by any condition that affects the muscles and nerve used for swallowing.A purpose of this study was to investigate the role of autonomic nervous system in patients with inability to swallow.Ten healthy male university students (19-25 years) were measured continuously electrocardiogram and blood pressure during supine and sitting position (bed up 90 degree). Frequency domain analysis of stationary R-R interval was performed to quantify the high frequency (HF), low frequency (LF) to HF ratio (LF/HF) of heart rate variability (HRV). From supine position to sitting position systolic blood pressure (SBP) was decreased significantly, diastolic blood pressure (DBP), heart rate (HR) and LF/HF (sympathetic activity) increased. There was no significant change in parameter such as HF (parasympathetic activity). Similar changes were occurred to sitting position for bed up 45 degree.We will measure both the electromyogram for suprahyoid and autonomic nervous function same time. Insight into this effect may lead to a understanding of safety and comfortable posture with patients with dysphagia.