本文選題：膝關(guān)節(jié)角度 + 表面肌電圖　； 參考：《蘇州大學(xué)》2012年碩士論文

【摘要】：研究目的： 膝關(guān)節(jié)是人們最重要的關(guān)節(jié)之一，而髕鍵末端病等膝關(guān)節(jié)病給人們的生活造成巨大困擾。髕腱是股四頭肌的延續(xù)，而股四頭肌是伸膝的主要裝置，股四頭肌的電機(jī)械應(yīng)答對(duì)膝關(guān)節(jié)有重要影響。利用等速測(cè)力系統(tǒng)在不同膝關(guān)節(jié)角度下對(duì)股四頭肌等長(zhǎng)肌力測(cè)試，同時(shí)用表面肌電進(jìn)行肌肉功能評(píng)價(jià)，用動(dòng)作反應(yīng)時(shí)測(cè)試系統(tǒng)進(jìn)行肌肉激發(fā)時(shí)間分析，旨在探討不同屈膝角度時(shí)股四頭肌的電機(jī)械應(yīng)答規(guī)律，以及疲勞對(duì)電機(jī)械應(yīng)答規(guī)律的影響。 研究方法： 本實(shí)驗(yàn)采用等速測(cè)力系統(tǒng)，對(duì)10名受試者在不同膝關(guān)節(jié)角度進(jìn)行最大等長(zhǎng)伸膝測(cè)試，同時(shí)對(duì)股外側(cè)肌、股內(nèi)側(cè)肌、股直肌進(jìn)行表面肌電信號(hào)的采集與記錄。分析不同膝關(guān)節(jié)角度時(shí)股四頭肌的表面肌電變化特征和動(dòng)作反應(yīng)時(shí)變化特征，以及疲勞前后的變化。 研究結(jié)果： （1）在等長(zhǎng)伸膝模式中，從屈膝10°到屈膝90°，股四頭肌的PT/BW在屈膝80°達(dá)到最大，有非常顯著性差異（p0.01）。 （2）在等長(zhǎng)伸膝模式中，隨著屈膝角度的增大，股四頭肌的RT呈減小趨勢(shì)，且具有非常顯著性差異（p0.01）；股四頭肌的PMT無(wú)顯著性變化；股外側(cè)肌、股內(nèi)側(cè)肌和股直肌的EMD均逐漸減小，有非常顯著性差異（p0.01）。 （3）在等長(zhǎng)伸膝模式中，隨著屈膝角度增大，iEMG的VM/VL先增大后減小，在屈膝40°達(dá)到最大，但無(wú)顯著性差異（p0.05）；股外側(cè)肌、股內(nèi)側(cè)肌和股直肌的iEMG%也無(wú)顯著性差異，但同一角度情況下，在40°、50°、60°和90°時(shí)，三者有非常顯著性差異（p0.01）。 （4）疲勞后，股四頭肌的PT無(wú)顯著性變化；股外側(cè)肌、股內(nèi)側(cè)肌和股直肌的PMT均較疲勞前減小，且股外側(cè)肌和股直肌呈顯著性差異（p0.05）；股外側(cè)肌、股內(nèi)側(cè)肌和股直肌的EMD較疲勞前延長(zhǎng)，股外側(cè)肌和股直肌呈顯著性差異（p0.05）。 （5）疲勞后，iEMG的VM/VL較疲勞前減小，無(wú)顯著性差異（p0.05）；股外側(cè)肌和股內(nèi)側(cè)肌的iEMG%均較疲勞前減小，無(wú)顯著性差異（p0.05），股直肌的iEMG%較疲勞前增大呈顯著性差異（p0.05）；股內(nèi)側(cè)肌的放電貢獻(xiàn)率最小，三者呈非常顯著性差異（p0.01）。 研究結(jié)論： （1）在一定的髖關(guān)節(jié)角度，從屈膝10°到屈膝90°的等長(zhǎng)伸膝模式中，膝關(guān)節(jié)發(fā)揮伸膝最大力量的角度為屈膝80°。 （2）股四頭肌動(dòng)作反應(yīng)速度與膝關(guān)節(jié)角度有關(guān)，一定程度上，，屈膝角度越大產(chǎn)生運(yùn)動(dòng)的速度越快。 （3）在不同膝關(guān)節(jié)角度，股四頭肌各肌群的貢獻(xiàn)率不同，在40°以后股外側(cè)肌放電占主導(dǎo)。 （4）疲勞是引起EMD延長(zhǎng)的重要因素。
[Abstract]:Objectives of the study: Knee joint is one of the most important joints. Patellar tendon is the continuation of quadriceps femoris, and quadriceps femoris is the main device of knee extension. The electromechanical response of quadriceps femoris has an important effect on knee joint. The isokinetic force measurement system was used to measure the equal length muscle strength of quadriceps femoris at different angles of knee joint, the muscle function was evaluated by surface electromyography, and the time of muscle stimulation was analyzed by action reaction time test system. The aim of this study was to investigate the electromechanical response of quadriceps femoris at different flexion angles and the effect of fatigue on electromechanical response. Research methods: In this experiment, the isokinetic force measurement system was used to test the maximal isometric extension of knee at different knee angles in 10 subjects, and the surface electromyography (EMG) signals of lateral femoral muscle, medial femoral muscle and rectus femoris muscle were collected and recorded. The changes of surface electromyography and movement response of quadriceps femoris at different knee angles were analyzed. The changes before and after fatigue were also analyzed. Results of the study: The PT/BW of quadriceps femoris reached the maximum at 80 擄from 10 擄to 90 擄in the isometric extension mode, and there was a significant difference between them (p 0.01). The RT of quadriceps femoris decreased with the increase of flexion angle, and the difference was significant (p0.01), the PMT of quadriceps femoris did not change significantly, the EMD of lateral femoris, medial femoral muscle and rectus femoris decreased gradually. There was a very significant difference (P 0.01). In the isometric extension mode, the VM/VL of EMG first increased and then decreased with the increase of flexion angle, and reached the maximum at 40 擄, but there was no significant difference (p0.05), and there was no significant difference in the VM/VL% of lateral, medial and rectus femoris, but at the same angle, there was no significant difference in iEMG% between the lateral, medial and rectus femoris, but at the same angle, there was no significant difference between the two groups. There was a significant difference among the three groups at 40 擄, 50 擄, 60 擄and 90 擄. (4) after fatigue, PT of quadriceps femoris did not change significantly, the PMT of lateral femoral muscle, medial femoral muscle and rectus femoris muscle decreased compared with those before fatigue, and there was significant difference between lateral femoral muscle and rectus femoris muscle (p0.05), lateral femoral muscle, medial femoral muscle and rectus femoris muscle. The EMD of medial femoral muscle and rectus femoris muscle was longer than that before fatigue, and the difference between lateral femoral muscle and rectus femoris muscle was significant (p0.05). (5) after fatigue, the VM/VL of iEMG was lower than that of before fatigue, and the VM/VL% of lateral and medial femoral muscles was lower than that of before fatigue. The iEMG% of rectus femoris muscle was significantly higher than that of before fatigue, and the contribution rate of medial femoral muscle was the smallest (P 0.01). The study concluded that: 1) in a certain hip joint angle, the angle of maximum strength of knee joint is 80 擄in the mode of equal-length extension from 10 擄to 90 擄of knee flexion. 2) the reaction speed of quadriceps femoris is related to the angle of knee joint, to a certain extent, the greater the flexion angle, the faster the speed of motion. 3) the contribution rate of quadriceps femoris muscle group was different at different knee angle, and the discharge of lateral femoral muscle dominated after 40 擄. Fatigue is an important factor in prolonging EMD.
【學(xué)位授予單位】：蘇州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2012
【分類號(hào)】：G804.2

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本文編號(hào)：1918111