Liang Nan, Ni Zhen, Takahashi Makoto, Murakami Tsuneji, Yahagi Susumu, Funase Kozo, Kato Takashi, Kasai Tatsuya
Department of Rehabilitation of Locomotor System Dysfunction, Graduate School of Health Sciences, Hiroshima University, 1-2-3 Kasumi, Japan.
Neuroreport. 2007 Aug 6;18(12):1241-5. doi: 10.1097/WNR.0b013e3282202707.
To investigate whether the facilitatory effects of motor imagery (MI) are dependent on motor strategies that vary with posture, we used transcranial magnetic stimulation to examine the effects of two forearm positions on motor-evoked potentials during an MI of index-finger abduction. MI-enhanced motor-evoked potentials of the first dorsal interosseous (prime mover) muscle in the forearm prone position were larger than those in the forearm neutral position. The opposite effects were seen in the extensor carpi radialis (synergist) muscle. These effects correspond to the different electromyography activities in the muscles when performing the actual movements in these two forearm positions. It is suggested that MI reflects different motor strategies in the contribution of agonist and synergist muscles towards a motor task.
为了研究运动想象（MI）的促进作用是否取决于随姿势变化的运动策略，我们使用经颅磁刺激来检查在食指外展的运动想象过程中，两种前臂位置对运动诱发电位的影响。在前臂俯卧位时，第一背侧骨间肌（原动肌）的运动想象增强的运动诱发电位大于前臂中立位时的运动诱发电位。在桡侧腕伸肌（协同肌）中则观察到相反的效果。这些效果与在这两种前臂位置进行实际运动时肌肉中不同的肌电图活动相对应。这表明运动想象反映了原动肌和协同肌在运动任务中的贡献方面的不同运动策略。
