不同負荷瞬發動作的肌肉波動之分析

The Analysis of Mechanical Property of Elbow Flexor under Different Loads with Explosive Movement

10.6569/NTUJPE.201009_(18).0003

林政東(Jenq-Dong Lin)；劉菊枝(Chu-Chih Liu)；吳國輝(Kuo-Hui Wu)

肌動振幅 ； 肌動中位數頻率 ； 神經激活形式 ； activation pattern ； explosive movement ； MMG amplitude ； MMG MDF

臺大體育學報

18輯（2010 / 09 / 01）

29 - 43

繁體中文

本實驗分析瞬發動作不同負荷下形成的肌動訊號，以了解不同負荷爆發力動作的肌肉波動之變化。受試者為體育系學生及校隊選手共21名，實驗以傳力器、關節角度計、Biovision肌電系統及2G加速規測量力量曲線、角位移及肌動訊號。受試者以15%、30%、45%、60%、75%、90%與105%MVC負荷下，進行瞬發屈肘動作，收集肌動資料。收集的資料經過處理後，以簡單迴歸進行統計分析，檢查瞬發動作不同負荷下形成的肌動振幅及肌動中位數頻率，顯著水準為.05。結果發現肌動振幅與中位數頻率隨負荷的提高而下降，即爆發力動作每一負荷儘全速之下，隨著負荷的下降，肌肉的波動振幅與頻率增加了，此一結果與僅考量神經激活形式的假設是不一樣的。

To understand the patterns of mechanical property of the elbow flexor with explosive movements, we examined the MMG (mechanomyography) signal induced by the movements. There were 21 young men who were the students of physical education and the members of school team voluntarily participating in this study. Loadcell, goniometer, 2G accelerators and Biovision electromyographic system were used to record the signals of forces, elbow angular displacements and MMG. The movements under different loads with the efforts of 15%、 30%、45%、60%、75%、90% and 105% of MVC were adopted, the movement was executed with the fastest velocity at each load, and the signals induced by each movement were collected. After the treatment of data, we adopted SPSS software to calculate the values of the parameters and simple regression was used to test the relationship between loads and MMG amplitude as well as MMG MDF (median frequency). The significance level was set at .05. The results demonstrated that while adopting the explosive movement with the most effort under different loads, it is negative correlated linearly between loads and MMG amplitudes as well as MMG MDF, showing while the loads increase, the MMG amplitude as well as MDF decrease, which is different fromt the hyperthesis of this article originated from the activation patern concluded from needle EMG studied.

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