脈聲儀系統經由血流動力學理論發展而來，利用微型感測器測量測手腕撓動脈脈波變化訊號，此訊號中包含了人體血流動力系統中任何的動態壓力變化的訊息，故我們使用脈聲儀系統做為數據收集的來源。本論文利用三種不同實驗法觀察自律神經活性的情況，包括能量密度頻譜、潘凱圖以及快速傅立葉轉換。第一個實驗利用潘凱圖分析5位健康男性經伐氏操作後的脈搏波訊號與文獻及能量密度頻譜做比較。在姿態實驗上使用分析法為能量密度頻譜，利用8位健康男性分析靜止與60度仰頭狀態下心跳變異率的情況是否與文獻相符合。結果得到仰頭後的分析其總功率與低頻功率具有增加的趨勢。最後使用11位男性做慢跑實驗觀察自律神經系統的調控狀態，使用能量密度頻譜與快速傅立葉轉換做為分析法，最後結果能量密度頻譜上趨勢與部分文獻未相符但快速傅立葉轉換具有相同趨勢。本研究之結果顯示，經由脈聲儀系統此量測工具，配合適當的軟體開發，可以方便及有效的進行心跳變異率的分析研究。

An audiocardiography system is developed from the hemodynamics theory. The variation of pulse signal from wrist artery has been measured and examined which contains the detailed hemodynamics information of cardiovascular system.This research collects data through a non-invasive audiocardiography system and three types of data analysis from the experimentations have been done which are power spectral density (PSD), Poincare’ plot and fast fourier transform (FFT) respectively to observe activity of autonomic nervous system under different situation. Pulse signal of five healthy young men through valsalva maneuver were analyzed by Poincare’ plot and PSD to compare with the relative references. During postural tilt analyzed PSD, the observed heart rate variability (HRV) were changed in 8 healthy young subjects during rest and 60°head-up tilt. The testing subjects had a notable increase in total and low frequency HRV during tilt. On evaluating the autonomic nervous system activity by using HRV with 11 runners by using PSD and FFT methods. The results don’t coincide with the frequency domain measures of HRV but FFT. Their results from FFT are consistent with expected HRV behavior their PSD pattern are not coincide with results expected from HRV behavior as shown on the open literature. It indicates a more detailed study need to be done to clear it.

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