Responses of finger flexor and extensor muscles to transcranial magnetic stimulation during isometric force production tasks.
Responses of finger flexor and extensor muscles to transcranial magnetic stimulation during isometric force production tasks.
复制标题
在等长力产生任务期间手指屈肌和伸肌对经颅磁刺激的反应。
DOI：
10.1002/mus.23804
复制
发表时间：
2013
期刊：
影响因子：
3.4
通讯作者：
Li,Sheng
中科院分区：
文献类型：
--
作者：
Park,Woo-Hyung;Li,Sheng
IntroductionIn this study we investigated neural mechanisms of finger force control. Methods10 right‐handed subjects performed isometric finger flexion and extension force productions at 10-60% of maximum voluntary contraction（MVC）using 4 fingers of the dominant hand.经颅磁刺激（TMS）应用于对侧手部运动区。我们测量了波动的背景力和TMS的反应，从手指屈肌和伸肌muscle.ResultsForce波动手指伸展过程中比在手指屈曲。运动诱发电位（MEP）增加的力量水平在屈指浅屈肌（FDS）在手指屈曲和伸指总伸肌（EDC）在手指。TMS诱导的力增加到40%MVC，然后在手指屈曲过程中下降，而在手指伸展过程中通过测试力水平持续下降。结论这些结果表明，FDS和EDC由不同的神经机制控制，最有可能归因于它们在日常活动中的不同功能角色。肌肉神经48：739-744，2013
IntroductionIn this study we investigated neural mechanisms of finger force control.MethodsTen right‐handed subjects performed isometric finger flexion and extension force productions at 10–60% of maximum voluntary contraction (MVC) using 4 fingers of the dominant hand. Transcranial magnetic stimulation (TMS) was applied over the contralateral hand motor area. We measured fluctuation of the background force and TMS responses from finger flexor and extensor muscles.ResultsForce fluctuation was greater during finger extension than during finger flexion. Motor evoked potentials (MEPs) increased with force levels in the flexor digitorum superficialis (FDS) during finger flexion and in the extensor digitorum communis (EDC) during finger extension. TMS‐induced forces increased up to 40% MVC and then decreased during finger flexion, whereas they decreased continuously through the tested force levels during finger extension.ConclusionsThese results suggest that FDS and EDC are controlled by different neural mechanisms, most likely attributable to their different functional roles in daily activities.Muscle Nerve48:739–744, 2013