视觉和支撑面顺应性对人体静态站立平衡控制过程中脑电-肌电相干性的影响

Study on Effects of Vision and Support Surface Compliance on Cortical-muscular Coherence during Static Standing Balance

目的:观察视觉和支撑面顺应性对人体站立平衡过程中大脑β波脑电与下肢肌肉肌电相干性(cortical-muscular coherence,CMC)的影响。方法:选取15名健康成年受试者(8男、7女,年龄22.8±1.7岁)为研究对象,观察其在软硬支撑面(2水平:软支撑面和硬支撑面)×视觉(2水平:睁眼和闭眼)×肌肉(2水平:左右胫骨前肌)共8种组合条件下,其脑电-肌电相干性的变化。实验中,每种动作组合重复做3次,每次持续30 s。结果:15人在6种组合条件下均出现了具有统计学意义的CMC,13人在其余的2种组合中出现了具有统计学意义的CMC。睁眼与闭眼状态相比,CMC有显著性差异(P<0.01)。在睁眼状态下,硬支撑面与软支撑面相比,CMC有显著性差异(P<0.05),在其它条件下CMC比较未见显著性差异。结论:人体静态站立平衡过程中对侧感觉运动皮质区β波脑电信号与胫骨前肌肌电之间具有显著的相干性,同时大脑感觉运动皮质区的β波CMC受视觉和支撑平面力学特点的影响。

ObjectiveTo observe impacts of vision and support surface compliance on the corticalmuscular coherence(CMC)of brainbeta wave during the human standing balance.MethodsFifteen healthy subjects(8 males,7 females,aged 22.8±1.7 yrs)were recruited to perform three 30-second trials under different composition conditions of the support surface compliance(2 levels:soft and firm support surfaces)×vision(2 levels:close and open eyes)×muscle(2 levels:right and left tibialis anterior muscles).Then,the subjects’beta CMC from contralateral sensorimotor cortex area and tibialis anterior muscle was calculated.ResultsAll 15 subjects presented significant beta CMC in 6 of 8 combined conditions,and 13 subjects showed significant beta CMC under the other 2 combined conditions.There was a significant difference in the beta CMC between when with opening and closed eyes(P<0.01).Moreover,with opening eyes,subjects showed higher beta CMC on the soft support surface compared to on the firm support surface(P<0.05).ConclusionThere is a significant beta CMC between the contralateral sensorimotor cortex area and tibialis anterior muscle during the human standing balance.Moreover,the beta CMC is closely related to the vision and support surface compliance.