• 作者： 鄭誠功; 熊曉恕; 賴金鑫
• 作者服務機構： 台大醫學院醫學工程研究中心; 台大工學院電機工程研究所; 台大醫院復建科
• 中文摘要： 本研究係發展肌電圖量化之系統方法來估算等長肌肉收縮之力矩，此方法包含以伏兔針灸點擷取股四頭肌肌群之肌電圖訊號，一個肌電圖平整的方法，一個電子機械時間差的估算，及一個數學模式以多項式迴歸方程式來量化肌電圖。三位受測者被要求膝關節及髖關節彎曲角度各90°固定於cybex Ⅱ肌力訓練系統他們分別做2次最大等長肌力收縮及3次自由長肌力收縮，前面2次的最大肌力收縮是用以建立量化模式，後面3次自由肌力收縮之數據是用來驗證此方法，此研究是以Medelec MS92肌電圖系統及表面肌電圖來收集肌電圖訊號，多項式迴歸方程式之最大階數是以決定值係數差0.0001為之。研究結果，三位受測者皆是以6階之多項式來建立數學模式，這顯示肌電圖與力矩之關係為非線性，在本方法驗證上是以由cybex Ⅱ量測得之力矩與由肌電圖預估之力矩的平方根差為之，三位受測者之平方根差為0.0597，0.0679及0.1080。這個結果證明肌電圖可預估股四頭肌等長收縮所產生之力矩。
• 英文摘要： A systematic method of EMG quantification is developed to estimate the isometric muscle momentdirectly from quantified surface EMG. This method includes the EMG Signals acquired from an acupunc-ture point Fu-Tu located on the quadriceps muscle group，an EMG smoothing scheme, an electromechanicaltime lag estimation, and a mathematical model with the polynomial regression function to quantify theEMG. Three subjects were asked to be tested on the CYBEX II dynamometer with a knee joint angle of90 degree flexion and hip joint angle of also 90 degrees. They were asked to perform "two" trials ofmaximal voluntary contraction and "three" trials of free voluntary contraction of the isometric exercise.The first two trials were used to build up the quantification model, and the latter three trials served asdata for the validation of the method．A Medelec MS92 EMG system with surface EMG electrodes wasused to acquire the EMG Signals. In the determination of the regression order of the polynomial equations,the threshold value 0.0001 of the difference of the coefficient of determination values was used. The resultsof the polynomial regression orders are all 6 for three subjects, which reflects a tendency of nonlinear be-havior of the EMG/moment relationship. A validation scheme was proposed to calculate the root meansquare difference (RMSD) of the measured knee extensor moments from the CYBEX II dynamometer andestimated moments from the EMG quantification. The mean values of the RMSD of the three subjects were0.0597, 0.0679 and 0.1080. These results demonstrate that the present approach can estimate the isometricmuscle moment exerted by the quadriceps muscle group.
• 中文關鍵字： EMG quantification; isometric muscle moment; quadriceps muscle; acupuncture point.
• 英文關鍵字： --