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

吞咽困难患者逐渐增多，但对于进食时头部和身体位置的安全性和舒适性知之甚少。吞咽困难可能与许多疾病有关。它是由任何影响吞咽肌肉和神经的情况引起的。本研究的目的是探讨自主神经系统在吞咽障碍患者中的作用。对10名健康男性大学生（19 ~ 25岁）进行仰卧位和仰卧位（床上90度）心电图和血压的连续测定。采用平稳R-R区间的频域分析，量化心率变异性（HRV）的高频（HF）、低频（LF）与高频（LF/HF）之比。从仰卧位到坐位收缩压（SBP）明显降低，舒张压（DBP）、心率（HR）和交感神经活动（LF/HF）升高。副交感神经活动等参数无明显变化。睡姿向上45度也发生了类似的变化。我们将同时测量舌骨上肌电图和自主神经功能。对这种影响的深入了解可能会导致对吞咽困难患者的安全和舒适姿势的理解。

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.