Modulation of corticospinal excitability dependent upon imagined force level
Modulation of corticospinal excitability dependent upon imagined force level
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DOI：
10.1007/s00221-013-3649-3
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发表时间：
2013-10-01
影响因子：
2
通讯作者：
Kanosue, Kazuyuki
中科院分区：
文献类型：
--
作者：
Mizuguchi, Nobuaki;Umehara, Izumi;Kanosue, Kazuyuki
运动想象被定义为在没有任何肌肉活动的情况下心理执行运动。在本研究中，当受试者想象不同力水平的等距肘部弯曲时，通过运动诱发电位（MEP）评估皮质脊髓兴奋性。记录右肱桡肌、肱二头肌和肱三头肌的肌电图。首先，记录每个受试者的肘部弯曲的最大自主收缩（MVC）。受试者使用视觉反馈练习执行 10%、30% 和 60% MVC。练习结束后，在用 10%、30% 和 60% MVC 的力进行肘部屈曲的图像过程中记录 MEP，没有任何反馈。 MEP 记录后，我们分配受试者在 10%、30% 和 60% MVC 下重现实际肘部屈曲力。 60% MVC 条件下肱桡肌和肱二头肌的 MEP 振幅显着大于 10% MVC 条件下的 MEP 振幅 (p < 0.05)。这些发现表明，运动想象过程中皮质脊髓兴奋性的增强与想象力水平的增加有关。
Motor imagery is defined as the mental execution of a movement without any muscle activity. In the present study, corticospinal excitability was assessed by motor evoked potentials (MEPs) when the subjects imagined isometric elbow flexion at various force levels. Electromyography was recorded from the right brachioradialis, the biceps brachii and the triceps brachii muscles. First, the maximum voluntary contraction (MVC) of elbow flexion was recorded in each subject. Subjects practiced performing 10, 30 and 60 % MVC using visual feedback. After the practice, MEPs were recorded during the imagery of elbow flexion with the forces of 10, 30 and 60 % MVC without any feedback. After the MEPs recording, we assigned subjects to reproduce the actual elbow flexion force at 10, 30 and 60 % MVC. The MEPs amplitudes in the brachioradialis and biceps brachii in the 60 % MVC condition were significantly greater than those in the 10 % MVC condition (p < 0.05). These findings suggest that the enhancement of corticospinal excitability during motor imagery is associated with an increase in imagined force level.