Real-time changes in corticospinal excitability related to motor imagery of a force control task
Real-time changes in corticospinal excitability related to motor imagery of a force control task
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与力控制任务的运动想象相关的皮质脊髓兴奋性的实时变化
DOI：
10.1016/j.bbr.2017.08.020
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发表时间：
2017
影响因子：
2.7
通讯作者：
Sugawara Kenichi
中科院分区：
文献类型：
--
作者：
Tatemoto Tsuyoshi;Tsuchiya Junko;Numata Atsuki;Osawa Ryuji;Yamaguchi Tomofumi;Tanabe Shigeo;Kondo Kunitsugu;Otaka Yohei;Sugawara Kenichi
目的探讨实时兴奋性变化的皮质脊髓通路相关的运动想象在不断变化的力量控制任务，使用经颅磁stimulation.Methods10名健康志愿者学会控制收缩力的等长右手腕背屈，以跟踪屏幕上的正弦波形式。参与者进行了40次训练任务与实际的肌肉收缩，以构建运动图像。然后，他们被要求在没有实际肌肉收缩的情况下执行任务，而是通过想象右手腕在背屈时的收缩。在运动想象过程中，测量经颅磁刺激在右侧桡侧腕伸肌（ECR）和桡侧腕屈肌（FCR）诱发的运动诱发电位（MEP）。在五个时间点诱导MEP：在成像之前，在逐渐生成的成像腕背屈（增加阶段），正弦波的峰值，在逐渐减少（减少阶段），并完成任务后。MEP的比率，成像MEP的比率，休息状态，比较前和训练后在每个时间点。ResultsIn ECR肌肉，MEP的比率显着增加，在增加阶段，并在背屈图像的峰值力训练后。此外，MEP比率在增加阶段比在减少阶段显著更大。在FCR，有没有显着的一致性changes.ConclusionCorticosporinal兴奋性在运动想象在等长收缩任务调制有关的力控制图像建设后的阶段。
ObjectiveTo investigate real-time excitability changes in corticospinal pathways related to motor imagery in a changing force control task, using transcranial magnetic stimulation (TMS).MethodsTen healthy volunteers learnt to control the contractile force of isometric right wrist dorsiflexion in order to track an on-screen sine wave form. Participants performed the trained task 40 times with actual muscle contraction in order to construct the motor image. They were then instructed to execute the task without actual muscle contraction, but by imagining contraction of the right wrist in dorsiflexion. Motor evoked potentials (MEPs), induced by TMS in the right extensor carpi radialis muscle (ECR) and flexor carpi radialis muscle (FCR), were measured during motor imagery. MEPs were induced at five time points: prior to imagery, during the gradual generation of the imaged wrist dorsiflexion (Increasing phase), the peak value of the sine wave, during the gradual reduction (Decreasing phase), and after completion of the task. The MEP ratio, as the ratio of imaged MEPs to resting-state, was compared between pre- and post-training at each time point.ResultsIn the ECR muscle, the MEP ratio significantly increased during the Increasing phase and at the peak force of dorsiflexion imagery after training. Moreover, the MEP ratio was significantly greater in the Increasing phase than in the Decreasing phase. In the FCR, there were no significant consistent changes.ConclusionCorticospinal excitability during motor imagery in an isometric contraction task was modulated in relation to the phase of force control after image construction.