臺灣博碩士論文加值系統

研究目的：本研究主要研究目的是探討肱二頭肌向心或離心收縮的疲勞運動介入前後，力矩和肌電圖訊號的變化。方法：受試者為17名健康男性。實驗分成兩個階段，分別執行向心及離心疲勞，兩階段至少相隔一個星期，受試者在等速測力器上呈坐姿，肘關節屈曲90°，測驗包括疲勞前後測的等長最大收縮以及向心或離心疲勞運動。實驗者會先收集前測等長最大收縮的力矩和肱二頭肌的肌電訊號。接下來受試者要進行肘屈肌的疲勞運動，達到疲勞後馬上進行後測。疲勞運動的內容為每秒45°的等速收縮，肘關節活動範圍在30-120°。疲勞定義為關節力矩連續三次未達等長最大收縮50％。肌電圖訊號帶狀濾波範圍為5-450赫茲，再經由快速傅立葉轉換成頻譜，計算出平均功率頻率。統計方法以成對樣本t檢定（paired t-test）分析向心和離心疲勞收縮次數，再用雙因子變異數分析（two-way ANOVA）分別分析兩種疲勞前後等長最大向心／離心收縮力矩與肌電圖以及向心／離心疲勞後等長最大收縮力矩和肌電圖的下降值。p值小於.05則為達到顯著差異。結果：向心疲勞的前後力矩、肌電圖振幅、平均功率頻率的達顯著差異。離心疲勞的前後力矩和平均功率頻率達顯著差異。離心疲勞收縮次數顯著大於向心疲勞。力矩下降值離心疲勞顯著大於向心疲勞。向心疲勞的平均功率頻率下降值顯著大於離心疲勞。結論：向心收縮對於肌肉的力量產生的影響大於離心收縮。相同程度的疲勞程度下，離心疲勞的肌電圖振幅前後沒有明顯下降，與產生的力矩對照，顯示離心疲勞後肌肉產生力量的效益降低。結締組織及彈性位能的幫助離心收縮產生力量，所以離心疲勞後神經肌肉的傳導速度下降較少。

Purpose：The purpose of this study was to compare the effects on joint torque and EMG singals of muscle fatigue generated by two different types of contraction. Methods：17 healthy male subjects were recruited for this study. Each subject was required to attend two test sessions that were separated by one week. During each test session, subjects were seated and their right forearms were fixed to an isokinetic dynamometer. Each test session included two measurments (pre and post test) and one concentric/eccentric fatigue protocol. The elbow flexors were obtained isometric MVC/MVEC torque and biceps EMG signals . Followed the measurement, the subjects executed elbow flexors maximum fatigue protocol. After fatigue potocol, the MVC/MVEC torque and EMG signal were measured immediately. Fatigue protocol were performed isokinetically at 45°s-1 betweent 30° and 120°. The difinition of fatigue was joint torque reduced to 50% of MVC. The EMG signals were filtered by 5-450Hz band pass and fast fourier transformation (FFT) transferred to power spectrum to calculate mean power frequency (MPF). The times of contraction of concentric and eccentric fatigue protocol were analyzed with a paired t-test, and torque and EMG variance were analyzed with two-way ANOVA (MVC/MVEC)* ( per/post fatigue protocal). Torque and EMG reduction were analyzed with two-way ANOVA (MVC/MVEC)*(CON/ECC fatigue). The level of significance was set at .05. Results: The joint torque, EMG amplitude and MPF of CON fatigue protocol variation was significantly different. The joint torque, and MPF of ECC fatigue protocol variation was significantly different. The times of contractions of ECC fatigue protocol was signigicantly more than CON fatigue protocol. The reduction of joint torque of ECC fatigue protocol was significantly more than CON fatigue protocol. On the other hand, the reduction of MPF of CON fatigue protocol was more than ECC fatigue protocol. Conclusion: The negative effect of concentric contractions on muscle strength production was greater than eccentric contractions. At same fatigue level, ECC EMG amplitude was signigicantly greater than CON EMG amplitude. Calculate with the joint torque shows that efficiency of ECC fatigue protocol was low. The elastic component of muscle and connective tissue may contribute to force production during eccentric contraction, so after ECC fatigue protocol, the reduction of neuromuscular conduction velocity was less.

目 錄
表 目 錄 VII
圖 目 錄 IX
第一章 緒論 1
第一節 研究背景 1
第二節 研究目的 3
第三節 研究假設 3
第四節 研究範圍及限制 4
第五節 操作型定義與名詞解釋 4
第二章 文獻探討 7
第一節　不同收縮模式生理特性之初探 7
第二節 關於疲勞之探討 10
第三節 肌肉不同收縮模式對肌電圖影響之探討 12
第三章 研究方法 17
第一節 研究對象 17
第二節　實驗地點與時間 17
第三節　實驗儀器與設備 17
第四節　實驗設計與步驟 21
第五節 資料收集與統計分析 24
第四章 結果 25
第一節 受試者基本資料 25
第二節 疲勞前後的力矩與肌電圖比較 25
第三節兩種收縮模式疲勞前後力矩與肌電圖下降值比較 35
第五章 討論 41
第一節 疲勞前後的力矩與肌電圖振幅比較 41
第二節 疲勞前後的肌電圖平均功率頻率比較 42
第三節兩種收縮模式疲勞前後力矩與肌電圖振幅下降值比較 43
第四節兩種收縮模式疲勞前後肌電圖平均功率頻率下降值比較 45
第六章　　結論與建議 47
第一節　結論 47
第二節　建議 47
參考文獻 48
附錄一、實驗注意事項與受試者同意書 54

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