Laboratoire Interuniversitaire de Biologie de la Motricité (EA 7424, LIBM), Univ Lyon, Université Claude Bernard Lyon 1, 69622 Villeurbanne, France.
Universidad de Alcalá, Unidad de Fisioterapia, Campus Universitario, Ctra. Madrid Barcelona, Alcalá de Henares, 28801 Madrid, Spain.
Neural Plast. 2018 Apr 2;2018:5351627. doi: 10.1155/2018/5351627. eCollection 2018.
Motor imagery contributes to enhance the (re)learning of motor skills through remapping of cortical networks. Combining motor imagery with anodal transcranial direct-current stimulation (a-tDCS) over the primary motor cortex has further been shown to promote its beneficial effects on postural control. Whether motor imagery should be performed concomitantly to a-tDCS (over depolarized membrane) or consecutively (over changing neurotransmitters activity) remains to be elucidated. In the present study, we measured the performance in a postural control task before and after three experimental conditions. Participants received a-tDCS before (tDCS), during (tDCS), or both before and during motor imagery training (tDCS). Performance was improved after tDCS, but not after both the tDCS and tDCS conditions. These results support that homeostatic plasticity is likely to operate following a-tDCS through decreasing cortical excitability and that motor imagery should be performed during anodal stimulation for optimum gains.
运动想象通过皮质网络的重新映射有助于增强运动技能的（再）学习。将运动想象与初级运动皮层的阳极经颅直流电刺激（a-tDCS）相结合，进一步显示出其对姿势控制的有益影响。运动想象应该与 a-tDCS（在去极化膜上）同时进行还是连续进行（在改变神经递质活性时）仍有待阐明。在本研究中，我们在三种实验条件下之前和之后测量了姿势控制任务的表现。参与者在接受 a-tDCS 之前（tDCS）、期间（tDCS）或在运动想象训练期间（tDCS）之前和期间都接受了 tDCS。tDCS 后表现有所改善，但 tDCS 和 tDCS 后均无改善。这些结果支持通过降低皮质兴奋性，tDCS 后可能会发生同型可塑性，并且为了获得最佳效果，运动想象应在阳极刺激期间进行。
