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首页> 外文期刊>Brain research >Changes in corticomotor excitability of forearm muscles in relation to static shoulder positions.
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Changes in corticomotor excitability of forearm muscles in relation to static shoulder positions.

机译：前臂肌肉皮质运动兴奋性的变化与静态肩部位置的关系。

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摘要

We examined whether the recruitment properties of the corticospinal pathway to forearm muscles are influenced by variations of the shoulder joint angle. Flexor carpi radialis (FCR) and extensor carpi radialis (ECR) muscles motor evoked potentials (MEPs) in response to transcranial magnetic stimulation were examined during different static positions of shoulder joint in the horizontal plane: from 30 degrees abduction to 30 degrees adduction. We found that at 30 degrees shoulder adduction, maximum slope and plateau phase of the ECR and FCR input-output relationship (i.e., relation between MEP size and stimulus intensity) were significantly higher and lower than at 30 degrees abduction of the shoulder joint, respectively. Intracortical inhibition (ICI) and intracortical facilitation (ICF) of the FCR were assessed using a paired-magnetic pulse paradigm. A significant decrease in ICF was observed after changing shoulder position from 30 degrees abduction to 30 degrees adduction. On the contrary, no variation in the amount of ICI occurred in relation to the same changes in shoulder position. FCR H-reflex to electrical stimulation of median nerve at elbow did not differ significantly between the two shoulder positions. We conclude that shoulder position influences the recruitment efficiency (gain) of the corticospinal volleys to motoneurones of forearm muscles. It is proposed that activity of peripheral receptors signaling static shoulder position influences corticomotor excitability of forearm muscles mainly at cortical level, although C3-C4 propriospinal system could be also involved. It is proposed that the above changes in corticomotoneuronal excitability to forearm muscles as function of shoulder joint position are part of a global proximal-distal synergy operating throughout reaching movements.
机译：我们检查了皮质脊髓途径至前臂肌肉的募集性质是否受到肩关节角度变化的影响。在水平面中肩关节的不同静态位置：从30度外展到30度内展，检查了经颅磁刺激对radial屈腕肌（FCR）和ex伸腕肌（ECR）肌肉运动诱发电位（MEP）的影响。我们发现，在30度肩关节内收时，ECR和FCR输入输出关系（即MEP大小与刺激强度之间的关系）的最大斜率和平稳阶段分别明显高于和低于30度肩关节外展时的水平和平稳期。 。使用配对磁脉冲范例评估FCR的皮质内抑制（ICI）和皮质内促进（ICF）。将肩部位置从30度外展改变为30度内展后，ICF明显下降。相反，相对于肩部位置的相同变化，ICI量没有变化。 FCR对肘部正中神经电刺激的H反射在两个肩部位置之间没有显着差异。我们得出的结论是，肩部位置影响皮质脊髓凌空向前臂运动神经元的募集效率（增益）。尽管C3-C4脊椎脊髓系统也可能参与其中，但提示外周受体信号活动的静态肩部位置的活动主要在皮质水平影响前臂肌肉的皮质运动兴奋性。有人提出，上述对前臂肌肉的皮膜神经元兴奋性的变化是肩关节位置的函数，是整个伸手动作中整体近端-远端协同作用的一部分。

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