Department of Neurology, Showa University School of Medicine, Tokyo, Japan.
J Clin Neurophysiol. 2009 Oct;26(5):358-65. doi: 10.1097/WNP.0b013e3181baaaa1.
To determine possible hemispheric differences of motor imagery in facilitating the anterior horn cells.
We conducted a side-to-side comparison of motor imagery to counter rest-induced suppression of spinal motor neurons in 10 right-handed healthy adults using the F wave as a measure of excitability. Studies consisted of sequential recording of F waves from the abductor pollicis brevis with 100 supramaximal stimuli applied to the median nerve on three consecutive sessions: (1) after standardized hand exercise to establish the baseline; (2) after immobilizing abductor pollicis brevis bilaterally for 3 hours, with one side assigned to relaxation task and the other side to motor imagery task; and (3) after standardized hand exercise to assess a recovery. The same sequence was repeated, switching the side of relaxation and motor imagery tasks.
F-wave persistence and average amplitude showed a significant decrease (P < 0.01) from baseline after relaxation task, recovering quickly after exercise, but no change (P > 0.05) after motor imagery task. The results showed no significant differences (P > 0.05) between dominant and nondominant hands.
Motor imagery facilitates the spinal motor neurons without hemispheric asymmetry.
确定运动想象在促进前角细胞方面可能存在的半球差异。
我们对 10 名右利手健康成年人进行了一项运动想象的左右对比研究，以对抗休息引起的脊髓运动神经元抑制，使用 F 波作为兴奋性的测量指标。研究包括在三个连续的会话中用 100 个最大刺激记录从拇指外展短肌的 F 波：（1）在进行标准化手部运动以建立基线后；（2）在双侧拇指外展肌固定 3 小时后，一侧分配给放松任务，另一侧分配给运动想象任务；（3）在进行标准化手部运动以评估恢复后。重复相同的顺序，切换放松和运动想象任务的侧别。
F 波持续时间和平均振幅在放松任务后从基线显著下降（P < 0.01），在运动后迅速恢复，但在运动想象任务后没有变化（P > 0.05）。结果显示，优势手和非优势手之间没有显著差异（P > 0.05）。
运动想象促进了脊髓运动神经元，没有半球不对称性。
