Aono Koji, Kodama Mitsuhiko, Masakado Yoshihisa, Muraoka Yoshihiro
Department of Rehabilitation Medicine, Tokai University School of Medicine, 143 Shimokasuya, Isehara, Kanagawa 259-1193, Japan.
Tokai J Exp Clin Med. 2013 Apr 20;38(1):1-6.
Changes in cortical excitability during motor imagery were investigated in order to reveal the effect of hand dominance. During motor imagery, motor evoked potentials (MEPs) were recorded from the first dorsal interosseous (FDI) muscle of the dominant hand using transcranial magnetic stimulation (TMS).
Twelve healthy right-handed subjects participated. Three motor imagery tasks (MITs) were provided; dominant hand grasping, non-dominant hand grasping, and ankle dorsiflexion ipsilateral to the dominant hand. MEPs were also recorded from the FDI muscle of the non-dominant hand during the same tasks.
MEPs increased significantly in the dominant hand during MIT, just before MIT of the dominant hand, and prior to ankle dorsiflexion ipsilateral to the dominant hand. MEPs obtained from the FDI muscle of the dominant hand during MITs were greater than that obtained from the FDI muscle of the non-dominant hand. However, this difference was not significant.
The left primary motor cortex (M1) was more excited than M1 during MITs of the hand muscles. Cortical excitability increased just before MIT of the contralateral hand and leg muscles.
研究运动想象期间皮质兴奋性的变化，以揭示利手的影响。在运动想象期间，使用经颅磁刺激（TMS）从优势手的第一背侧骨间肌（FDI）记录运动诱发电位（MEP）。
12名健康的右利手受试者参与研究。提供了三项运动想象任务（MIT）；优势手抓握、非优势手抓握以及与优势手同侧的踝关节背屈。在相同任务期间，也从非优势手的FDI肌肉记录MEP。
在MIT期间、优势手MIT之前以及优势手同侧踝关节背屈之前，优势手的MEP显著增加。在MIT期间从优势手的FDI肌肉获得的MEP大于从非优势手的FDI肌肉获得的MEP。然而，这种差异并不显著。
在手部肌肉的MIT期间，左侧初级运动皮层（M1）比M1更兴奋。对侧手和腿部肌肉的MIT之前，皮质兴奋性增加。
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