运动疲劳后人体脑区脑电功率谱特征的反应分析

分析在运动疲劳状态下人体脑电信号的反应特征。在某体育院校中随机选择30名健康男性志愿者,在开始实验前,首先令受试者熟悉实验流程,对受试者强迫高强度运动,在对受试者脑电信号进行测试时,电极依据国际10/20系统安放,将人体两个耳垂看作参考电极,前额正中接地。正式实验包括两部分:第一部分是受试者分别以20%、60%MVC进行静态屈肘诱发屈肘肌疲劳实验;第二部分为疲劳运动后脑电波脑电功率谱百分比变化实验。不同脑区脑电功率谱能量通常集中于5~20 Hz频率区间中,每个脑区脑电信号功率谱能量曲线的峰值均为10 Hz左右。60%MVC运动疲劳实验中不同脑区脑电功率谱能量处于3~60 Hz的广泛频率区间中,功率谱能量曲线峰值均约为14 Hz;和运动前半段脑电功率谱能量比较,运动后半段左侧脑区和右侧脑区脑电功率谱能量值在一定程度呈上升趋势,中间脑区无显著变化,前、后脑区整体呈增加趋势,但在部分频率下有所降低。20%MVC与60%MVC运动疲劳实验后半段各脑区各频段能量平均值较前半段均在一定程度上有所增加。运动疲劳后γ波指数在第10 min和安静值相比显著增加,P0.05,运动疲劳后θ波指数在第10、20和30 min和安静值相比显著降低,P0.05;运动疲劳后α波指数均低于安静值,但无显著性差异,P0.05;运动疲劳后β波指数在第30 min和安静值相比显著降低,P0.05。说明运动能够提高神经系统功能,促进大脑发育。

Sports fatigue after human brain brain response analysis of power spectrum characteristics

objective: to analyze characteristics of sports fatigue in the human brain electrical signal response;Methods: in a random selection of 30 healthy male volunteers in sports colleges and universities, before starting the experiment, the first to make participants familiar with the process of experiment, the subjects, and stretched to elbow biggest independent contraction force test, the test subjects eeg signals, the electrode according to the international system was 10/20, the two lobes body as the reference electrode, the forehead grounding, formal experiment includes two parts: the first part is the subjects respectively by 20% and 60% MVC static bend ancon induced elbow flexion muscle fatigue experiments, the second part is the fatigue after exercise brain electrical brain waves spectrum percentage change experiment.Results: different brain regions of cerebral electrical power spectrum energy usually focus on 5 ~ 20 hz frequency range, each brain eeg power spectrum energy curve peak are around 10 hz.60% MVC sports fatigue experiments in different brain regions of cerebral electrical power spectrum energy in 3-60 hz wide frequency range, the power spectrum energy curve peak all about 14 hz, and the first part of the movement of brain electric power spectrum and energy movement during the second half of the left brain and right brain brain electrical power spectrum energy is on the rise, to a certain extent, diencephalon area had no significant changes in the front and back area as a whole increased, but the under part of the frequency decreases.20% MVC and 60% MVC sports fatigue experiments during the second half of the first part of the brain regions of the average energy spectrum are all increased to some extent.Sports fatigue after the gamma index compared in 10 minutes and quiet value increased significantly, P < 0.05, sports fatigue in 10, 20 and the theta index after 30 minutes compared with quiet value decreased significantly, P < 0.05, the exercise fatigue after alpha index is lower than the value of quiet, but there was no significant difference, P > 0.05;Sports fatigue after beta index in the 30th minute compared with quiet value decreased significantly, P < 0.05.Conclusion: exercise can improve the nervous system function, promote brain development.