Effects of Relaxation in Salt Water on Cardiac Autonomic Nervous System Activity

本研究的目的是明确在盐水（SW）或在水（W）或对照C条件下放松对心脏自主神经系统活动的影响。2名男性和4名女性作为受试者（n=6，平均年龄25.3岁）。水温为31 ℃。在放松过程中测量心率、血压和摄氧量。采用快速傅立叶变换（FFT）对心率变异性进行功率谱分析，估计心脏自主神经系统的活动。高频（HF; 0.15- 0.40 Hz）和面积以及低频（LF; 0.04- 0.15 Hz）与HF的比率（LF/ HF）分别用作心脏迷走神经活动和交感神经活动的指标。各条件下血压和摄氧量无显著差异。SW和W期HF的Nu（归一化单位; %）显著高于C期。SW和W时心率和LF/ HF明显低于C时。这些数据表明，心脏迷走神经活动和交感神经活动的放松过程中浸泡的影响。以下是一些要点。1.盐水中放松对心脏自主神经系统活动的影响2.仰卧漂浮对心率、血压和心脏自主神经系统活动的舒张作用3.放松时水温对心脏自主神经系统调节的影响4.水中放松对女性心率、血压和心脏自主神经系统调节的影响。水中放松对老年人心率、血压及心脏自主神经系统调节的影响

The purpose of this study was to make clear the effects of relaxation in salt water (SW) or in water (W) or control c conditions on cardiac autonomic nervous system activity. Two males and four females served as subjects (n=6, mean age 25.3yrs). Water temperature was 31 ℃. Heart rate, blood pressure and oxygen uptake were measured during relaxation each conditions. Cardiac autonomic nerveous system activity was estimated with the power spectrum analysis of heart rate variavility by using the Fast Fourier Transformation (FFT). High frequency (HF; 0.15- 0.40 Hz) and areas and the ratio of low frequency (LF; 0.04- 0.15 Hz) to HF (LF/ HF) were used as an indicator of cardiac vagal activity and sympathetic nervous activity, respectively. There were not significant differences in blood pressure and oxygen uptake among each conditions. Nu (normalized unit; %) of HF during SW and W were significantly higher than C. Heart rate and LF/ HF during SW and W were significantly lower than C. These data suggested that cardiac vagal activity and sympathetic nerveous activity during relaxation were affected by immersion. A number of points are given below. 1. Effects of Relaxation in Salt Water on Cardiac Autonomic Nervous System Activity 2. Relaxative effects of supine floating on heart rate, blood- pressure and cardiac autonomic nervous system activity 3. Effects of water temperature on cardiac autonomic nervous system modulation during relaxation 4. Effects of relaxation in water on Heart Rate, Blood Pressure and Cardiac Autonomic Nervous System Modulation in Female 5. Effects of relaxation in water on Heart Rate, Blood Pressure and Cardiac Autonomic Nervous System Modulation in elderly