Jensen Peter, Frisk Rasmus, Spedden Meaghan Elizabeth, Geertsen Svend Sparre, Bouyer Laurent J, Halliday David M, Nielsen Jens Bo
Department of Nutrition Exercise and Sports, University of Copenhagen , Copenhagen , Denmark .
Elsass Institute , Charlottenlund, Denmark .
J Mot Behav. 2019;51(6):668-680. doi: 10.1080/00222895.2018.1563762. Epub 2019 Jan 18.
The present study used coherence and directionality analyses to explore whether the motor cortex contributes to plantar flexor muscle activity during the stance phase and push-off phase during gait. Subjects walked on a treadmill, while EEG over the leg motorcortex area and EMG from the medial gastrocnemius and soleus muscles was recorded. Corticomuscular and intermuscular coherence were calculated from pair-wise recordings. Significant EEG-EMG and EMG-EMG coherence in the beta and gamma frequency bands was found throughout the stance phase with the largest coherence towards push-off. Analysis of directionality revealed that EEG activity preceded EMG activity throughout the stance phase until the time of push-off. These findings suggest that the motor cortex contributes to ankle plantar flexor muscle activity and forward propulsion during gait.
本研究采用相干性和方向性分析，以探究运动皮层在步态的站立期和蹬离期是否有助于足底屈肌活动。受试者在跑步机上行走，同时记录腿部运动皮层区域的脑电图（EEG）以及腓肠肌内侧和比目鱼肌的肌电图（EMG）。通过成对记录计算皮质肌肉和肌肉间的相干性。在整个站立期均发现β和γ频段存在显著的脑电图 - 肌电图和肌电图 - 肌电图相干性，在蹬离期相干性最大。方向性分析表明，在整个站立期直至蹬离时刻，脑电图活动先于肌电图活动。这些发现表明，运动皮层在步态期间有助于踝关节足底屈肌活动和向前推进。
