Cortical representation of rhythmic foot movements
Cortical representation of rhythmic foot movements
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DOI：
10.1016/j.brainres.2008.07.046
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发表时间：
2008-10-21
期刊：
影响因子：
2.9
通讯作者：
Stolze, Henning
中科院分区：
文献类型：
--
作者：
Raethjen, Jan;Govindan, R. B.;Stolze, Henning
大脑皮层参与了手部有节奏的运动。然而，大脑皮层对足部节律性运动模式的贡献从未在人类中进行过评估。在这项研究中，我们调查了10名健康受试者的脑电图活动有关的节奏步进和轻敲运动。受试者进行自步速快速双边反相，同相和单边有节奏的足部运动以及小腿肌肉的等长共同收缩，而坐在尽可能放松。胫前肌的表面EMG与64通道EEG并行记录。计算功率谱、皮质肌相干性和皮质肌延迟。所有受试者在中央中线区域进一步延伸到额叶近中区的步进频率下表现出皮质肌的连贯性。这种连贯性的大小和地形是平等的右，左胫前肌和所有的运动条件。在共收缩期间，在15-30 Hz范围内存在相干性，该范围被细化到中央中线区域。EEG-EMG延迟显着的9名受试者之间的值为14和26毫秒，EMG-EEG反馈只发现在6名受试者之间的延迟25和40毫秒。我们得出结论，节奏的运动模式的脚代表在皮层，传输到肌肉的延迟兼容快速皮质脊髓传输和反馈到皮层。类似的皮质贡献可能对人类的步态控制也很重要。(C)2008年由Elsevier B. V.出版。
The cortex is involved in rhythmic hand movements. The cortical contribution to rhythmic motor patterns of the feet, however, has never been evaluated in humans. In this study we investigated EEG activity related to rhythmic stepping and tapping movements in 10 healthy subjects. Subjects performed self-paced fast bilateral anti-phase, in-phase and unilateral rhythmic foot movements as well as an isometric cocontraction of the calf muscles, while being seated as relaxed as possible. Surface EMG from the anterior tibial muscles was recorded in parallel with a 64 channel EEG. Power spectra, corticomuscular coherence and corticomuscular delay were calculated. All subjects showed corticomuscular coherence at the stepping frequencies in the central midline region that extended further to the frontal mesial area. The magnitude and the topography of this coherence were equal for the right and left anterior tibial muscle and all movement conditions. During cocontraction there was coherence in the 15-30 Hz range which was refined to the central midline area. EEG-EMG delays were significant in 9 subjects with values between 14 and 26 ms, EMG-EEG feedback was only found in 6 subjects with delays between 25 and 40 ms. We conclude that rhythmic motor patterns of the feet are represented in the cortex, transmitted to the muscles with delays compatible with fast corticospinal transmission and fed back to the cortex. A similar cortical contribution may be important also for gait control in humans. (C) 2008 Published by Elsevier B.V.