【作者】 邹彬；

【导师】 张立；

【作者基本信息】 武汉体育学院 ， 运动人体科学， 2008， 硕士

【摘要】 目的:研究人体股外侧肌静力性与动力性运动疲劳下的肌电和脑电变化规律,通过与对不同方式运动时肌电疲劳阈拐点的比较,找出肌电参数与脑电的关系,为脑电用于疲劳产生机制的研究打下基础,并为康复中肌肉锻炼方式的选择提供可能的理论依据。方法:选取武汉体育学院研究生20名,其中体育专业10名,非体育专业10名,分三天测试,第一天随机抽取受试者作最大肌力MVC测试和动力性运动,按实验测得的疲劳阈拐点出现的早晚划分早晚各10名定为A组(晚)和B组(早)进行比较,第二天对两组测试静力性运动2/3MVC负荷,第三天对两组测试静力性运动1/3MVC负荷。实验做到疲劳结束,记录受试者肌电和脑电信号。结果:动力性运动后按疲劳阈拐点分的A、B两组与受试者锻炼情况基本一致,A组肌电疲劳阈拐点出现比B组晚,静力性运动1/3MVC负荷下运动初期RMS上升率比2/3MVC负荷大,不管1/3MVC还是2/3MVC的负荷脑电α指数上升的拐点与肌电疲劳阈吻合。静力性运动脑电α指数在疲劳阈拐点后下降,但仍保持较高水平,且A组比B组下降得快。结论:(1)肌电疲劳阈拐点可以评价个人的运动能力(2)在康复锻炼中选择小强度负荷要比大强度负荷能达到更好的锻炼效果。(3)经常锻炼者的脑电疲劳稳定性要比不经常锻炼者好。(4)运动单位的募集导致肌肉力量改变的同时大脑皮层的活动也在发生与之相适应的变化,表明脑电拐点变化可与肌电疲劳阈结合作为检测疲劳的指标,但其生理机制还需作进一步的研究。更多还原

【Abstract】 Objective : This article focuses on studying the changes of electromyogram and electroencephalogram for different burdens in the different modes of exercise. We find the isochronous characteristics between them and find out the exercise effect on them. We try to illuminate the relation and the mechanism for the experiment, then it may apply to the fatigue and the healing study.Methods:We gathered 20 graduate students in Wuhan Institution of Physical Education, includes 10 students who usually take exercise and the others who have reverse condition. It took 3 days for this experiment. On 1st day we chose the subjects to complete the test of MVC and dynamic exercise, then compared the result based on group A and B partitioned by the threshold in fatigue in the electroencephalogram. On 2nd day we completed the test of static exercise with the load of 2/3 MVC. On 3rd day we completed the test of static exercise with the load of 1/3 MVC. All the tests were ended when the subjects have been tired.Result:The groups partitioned by the threshold in fatigue are consistent with their base situation of take exercise. The inflexion of the threshold in fatigue in group A appears later than that in group B. The rise of RMS at the beginning of the static exercise with the load of 1/3MVC is higher than that of 2/3MVC. The inflexion ofαindex is the same as the threshold in fatigue in the electroencephalogram with all the burden. Theαindex is descend after the threshold in fatigue in the static exercise, but still at a high level. The speed of descend in group A is faster than that in group B.Conclusion:(1) We can use threshold in fatigue in the electroencephalogram to evaluate the individual exercise capability. (2) We can choose less burden to obtain better effect in healing exercise. (3) The stability of electroencephalogram for the people who usually take exercise is better than that for the people who hardly take exercise. (4) The activity of pallium changes when the power of the muscle changes by motor unit, it indicates that we may combine the changes of inflexion in electroencephalogram with the threshold in fatigue. We need more study on the physiological mechanism.更多还原