功能性电刺激对运动想象皮层活动的影响研究

脑卒中是现代社会运动功能障碍的首要诱因。针对传统被动强化肢体运动康复训练手段单一及训练策略缺乏客观评价参数指导等关键问题,设计了右上肢运动想象融合不同强度功能性电刺激(阈上与阈下及无刺激)的实验任务范式,17名年轻健康右利手被试参与各项任务实验。脑电时频特征及统计学结果显示:刺激与无刺激模式间C3/C4导联α频带能量及CPz导联β频带能量存在显著性统计差异;阈上刺激与阈下刺激α频带能量仅在辅助运动皮层存在显著的激活差异。以上结果初步可证实,MI结合FES的康复训练模式更有助于激活运动皮层;可推论出FES作用能够强化包括辅助和初级运动皮层、感觉运动皮层在内的α节律及感觉运动皮层的β节律皮层神经活动。

Research on the effect of FES on cortex activities of motor imagery

Stroke is the leading cause of motor dysfunction in modern society. Aiming at the key problems that the means of traditional rehabilitation training of passive intensive limb motion is relatively simple, the mechanism for recovery is unclear and the training strategy lacks guidance with objective evaluation indexes, an experiment task canonical form of right upper limb motor imagery fusing functional electrical stimulation with different intensity (including supraliminal and subliminal stimulation and non stimulation) was designed. Seventeen right handed healthy young subjects were recruited to participate in various experiment tasks. Electroencephalogram time frequency features and statistical results show that there are significance statistic differences in the energies of alpha band at C3/C4 leads and beta band at CPz lead between the stimulation and non stimulation modes, and there is significant activation difference in the energy at alpha band only at supplementary motor cortex in supraliminal and subliminal stimulation modes. The above results preliminarily prove that the rehabilitation training mode of motor imagery combining with FES is more conducive to motor cortex activation, and it may be deduced that FES could enhance the cortex neural activities of alpha rhythm at supplementary motor cortex, primary motor cortex and sensorimotor cortex, as well as the cortex neural activities of beta rhythm at sensorimotor cortex.