Mima T, Simpkins N, Oluwatimilehin T, Hallett M
Human Motor Control Section, Medical Neurology Branch, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD 20892-1428, USA.
Neurosci Lett. 1999 Nov 12;275(2):77-80. doi: 10.1016/s0304-3940(99)00734-x.
We studied the relationship between cortical and muscular oscillatory activities and muscular force level during a tonic contraction task using electroencephalography (EEG). Within the weak to moderate force level, the normalized power in the alpha band in the contralateral sensorimotor areas was inversely linearly correlated with the force. Cortical-muscular coherence was observed in the beta band and its magnitude was not affected by the force. In contrast, during strong contractions, EEG power in the gamma band increased and was partly correlated with the Piper rhythm in the electromyogram. Our results show that the multiple oscillatory activities in the cortex are correlated with the force level in different ways. Cortical gamma band oscillation may reflect both focused attention and the efferent drive to the muscle during very strong tonic contraction.
我们使用脑电图（EEG）研究了在强直性收缩任务期间皮质与肌肉振荡活动及肌肉力量水平之间的关系。在弱至中等力量水平范围内，对侧感觉运动区α波段的归一化功率与力量呈负线性相关。在β波段观察到皮质-肌肉相干性，其幅度不受力量影响。相反，在强力收缩期间，γ波段的脑电图功率增加，并且与肌电图中的派珀节律部分相关。我们的结果表明，皮质中的多种振荡活动以不同方式与力量水平相关。皮质γ波段振荡可能反映了在非常强力的强直性收缩期间的集中注意力和对肌肉的传出驱动。
