為了因應現代生活繁忙的步調,可以簡單容易的讓人自我檢測身體的健康狀況,本研究成功實現一個心電圖(ECG)量測、心率變異分析裝置,可以即時監測心率的變化與心率變異分析。利用手握式電極將心電圖訊號即時顯示在液晶顯示器螢幕上,並同步儲存心電圖資料在Micro SD卡。本裝置採用類比電路、記憶體管理晶片、液晶顯示器、MSP430微控器所完成。韌體部分,運用了不同的數位濾波器將訊號做處理後,能夠清楚的判斷出正確的R波,利用R波來計算R-R間距而得到心率,透過頻譜轉換,能即時計算出心率變異的各項數據。並可利用MATLAB所設計的圖形化程式介面,提供醫護或研究人員等做後續心率變異性分析。我們針對國小教師在面臨職場的工作壓力下,精神上的負荷所產生的心理壓力會影響生理狀況,因此利用本裝置分析來評估教師們的工作負荷。
In order to the busy pace of modern life, a simple and easy way, heart rate variability (HRV), let people look over theirself healthy condiction. In this study, an electrocardiogram (ECG) was used to monitor the real-time heart rate and analyze the HRV. ECG handle electrodes were used. ECG signal immediately displayed on the liquid crystal display and simultaneously was stored in micro SD card. This device was organized by an analog circuit, memory management chip, LCD monitors and MSP430 microcontroller. In the firmware, using different filters for digital signal processing, it can clearly determine the proper R-wave, calculate the R-R interval, and converse the spectrum of HRV. A MATLAB graphical user interface was designed to provide a easy using tool for health care or researcher to do heart rate variability analysis. Finally, elementary school teachers who now work on a high stress environment were considered as the group of mental work load. This device was used to evaluate their work load.