不同程度紧身压迫对踏蹬运动中下肢sEMG变化特征的影响

发布时间：2018-03-03 10:56

本文选题：紧身运动装　切入点：压迫度　出处：《苏州大学》2012年硕士论文　论文类型：学位论文

【摘要】：研究目的：通过对采用表面肌电图技术所获得的相关肌电指标数据进行分析和研究，定量反映不同强度的匀速踏蹬运动至疲劳过程中，下肢肌群在不同程度紧身压迫下的sEMG变化特征，进而探讨紧身压迫度对肌肉活动的影响，，以期丰富和拓展当前运动训练的机能评定内容和监测手段，为紧身运动服装在健身、训练和比赛等实践中的应用提供科学理论依据。研究方法：实验随机抽取未进行过系统踏蹬训练的青年健康男性受试者10名，在瑞典MANOEK839E功率车上分别以下肢无紧身压迫、中度紧身压迫、高度紧身压迫状态完成中强度和大强度负荷的匀速踏蹬运动至疲劳测试，同步采集与记录股内侧肌、股外侧肌、股二头肌、腓肠肌内侧、胫骨前肌的sEMG信号，并按运动时程将其分为10段，再对iEMG和MF肌电指标数据进行标准化处理，最后采用双因素方差分析和事后多重比较检验考察各组实验数据间的差异。研究结果：（1）无紧身压迫下，下肢肌iEMG(%)值在中强度和大强度负荷的踏蹬运动中后期总体表现出随时间延长逐渐增加的趋势；MF(%)值则在中强度和大强度负荷的踏蹬运动中后期总体表现出随时间延长逐渐降低的趋势；其中，大强度负荷中的iEMG(%)值增长幅度和MF(%)值降低幅度均高于中强度负荷。（2）中度紧身压迫下，在中强度负荷踏蹬运动相邻时段之间，下肢肌iEMG(%)值总体增长幅度及MF(%)值总体降低幅度均与无紧身压迫时无明显差异；在大强度负荷踏蹬运动后期，除腓肠肌内侧无明显差异外，股内侧肌、股外侧肌、股二头肌、胫骨前肌iEMG(%)值总体增长幅度及MF(%)值总体降低幅度均较无紧身压迫时有所下降。（3）高度紧身压迫下，在中强度负荷踏蹬运动后期，除腓肠肌内侧无明显差异外，股内侧肌、股外侧肌、股二头肌、胫骨前肌iEMG(%)值总体增长幅度及MF(%)值总体降低幅度均较无紧身压迫时有所下降；在大强度负荷踏蹬运动后期，除腓肠肌内侧无明显差异外，股内侧肌、股外侧肌、股二头肌、胫骨前肌iEMG(%)值总体增长幅度及MF(%)值总体降低幅度均较无紧身压迫时有所上升。研究结论：外加中度紧身压迫在大强度踏蹬运动后期与外加高度紧身压迫在中等强度踏蹬运动后期对下肢目标肌群的作用相似，均利于维持局部肌肉收缩的输出功率及外周运动单位动作电位的传导速率，在一定程度上有助于延缓肌疲劳和延长运动时效；相反，外加高度紧身压迫在大强度踏蹬运动后期则会加速肌疲劳的发展进程。
[Abstract]:Objective: to analyze and study the relevant EMG index data obtained by surface electromyography (EMG) technology, and to quantitatively reflect the different strength of constant speed pedaling to fatigue process. In order to enrich and expand the function evaluation and monitoring methods of current sports training, the sEMG changes of lower extremity muscle group under different degrees of tight compression were discussed, and the effects of tights on muscle activity were discussed. The application in practice such as training and competition provides scientific theoretical basis. Methods: ten young healthy male subjects without systematic pedal training were randomly selected from the Swedish MANOEK839E power vehicle with lower extremity compression without tightness and moderate tightness compression. SEMG signals of medial femoral muscle, lateral femoral muscle, biceps femoris muscle, medial gastrocnemius muscle and anterior tibial muscle were collected and recorded simultaneously under high tibial compression. It was divided into 10 segments according to the exercise time course, and then the iEMG and MF electromyoelectric index data were standardized. Finally, the differences between the experimental data of each group were investigated by using double factor analysis of variance and multiple comparison tests afterwards. Research results: 1) under no tight pressure, The value of iEMG) of lower extremity muscle showed a trend of increasing gradually with the extension of time in the middle and late period of the pedal exercise with medium strength and high intensity load.) the value of iEMG value in the middle and late period of the middle and high intensity load showed the overall trend of prolonging with time in the middle and late period of the pedal exercise. A tendency of gradual decline in length; Among them, the increase range of iEMG value and the decrease of MFN value in heavy load are higher than those in medium strength load. 2) under moderate tightness, the value of iEMG) increases between the adjacent periods of middle strength load pedal exercise, and the decrease range of MFU value is higher than that of medium strength load. There was no significant difference in the total increasing range and MFN value between the lower limb muscle and the lower extremity muscle, except for the medial part of gastrocnemius muscle, lateral femoral muscle, biceps femoris, and biceps femoris, except for the medial part of gastrocnemius muscle. The total increase range of iEMG value of anterior tibial muscle and the decrease of MFN value were lower than those of non-tibial compression. Under the condition of high tibia compression, the medial femoris muscle was not significantly different except for the medial gastrocnemius muscle in the late stage of pedal exercise with moderate strength load. The value of lateral femoral muscle, biceps femoris muscle, anterior tibial muscle iEMGN) increased and MFU decreased slightly compared with those of non-tibial compression, and the medial femoris muscle, except the medial gastrocnemius muscle, had no significant difference in the late stage of pedal exercise with high intensity load. The value of lateral femoral muscle, biceps femoris muscle, anterior tibial muscle iEMG) increased in general and MFU decreased more than that in non-tibial compression. Conclusion: the effect of additional moderate tightness compression on the target muscle group of lower extremity is similar to that of high tightness compression in the late stage of high intensity pedal exercise and that of high tightness compression in the late stage of moderate intensity treading exercise. It is beneficial to maintain the output power of local muscle contraction and the conduction rate of peripheral motor unit action potential to some extent help to delay muscle fatigue and prolong exercise time; on the contrary, The development of muscle fatigue will be accelerated during the later period of high-intensity pedaling.
【学位授予单位】：苏州大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：G804.2

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