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首页> 外文期刊>Experimental Brain Research >Coupling of antagonistic ankle muscles during co-contraction in humans
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Coupling of antagonistic ankle muscles during co-contraction in humans

机译：人类共收缩过程中拮抗性踝部肌肉的耦合

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摘要

In 35 healthy human subjects coupling of EMGs recorded from the tibialis anterior (TA) and soleus (Sol) muscles during voluntary co-contraction was analysed in the time and frequency domains. Two patterns were observed in different subjects or in the same subject on different occasions. One pattern consisted of central peaks in the cumulant density function of the two signals, which was often accompanied by coherence in the 15–35 Hz frequency band. The other pattern consisted of a central trough in the cumulant density function, which was mostly accompanied by coherence around 10 Hz. When this was the case oscillations were usually observed in the cumulant density function with time lags of 100 ms. Both patterns could be observed in the same subject, but usually not at the same time. Coherence around 10 Hz associated with a central trough in the cumulant density function was less common during weak than during strong co-contraction. The central peak with coherence in the 15–35 Hz frequency band in contrast tended to be most common during weak contraction. There was a tendency for the 10-Hz coherence with central trough to occur when the contractions had been maintained for some time. Both patterns could be observed when sensory feedback in large diameter afferents was blocked by ischaemia. When a central peak with coherence in the 15–35 Hz frequency band was observed for paired TA and Sol EMG recordings (10 out of 19 subjects), a coupling in the same frequency band was also observed between the EMG activities from the two muscles and the EEG activity recorded from the leg area of the motor cortex. When the central trough and the coherence around 10 Hz was observed for the EMG recordings (8 out of 19 subjects), no significant coherence was observed between EEG and EMG in 7 of the 8 subjects. In the last subject coherence around 10 Hz was observed. It is suggested that these findings signify the existence of two different central input systems to antagonistic ankle motoneurones: one input activates one muscle while depressing the antagonist and the other coactivates antagonistic motoneurones. The data suggest that at least the latter input depends on motor cortical activity.
机译：在35名健康人类受试者中，在时域和频域中分析了自愿共收缩期间从胫前肌（TA）和比目鱼肌（Sol）记录的肌电信号的耦合。在不同的受试者或同一受试者的不同场合观察到两种模式。一种模式由两个信号的累积密度函数中的中心峰组成，通常在15-35 Hz频带中伴随有相干性。其他模式由累积密度函数中的中央波谷组成，该波谷主要伴随着10 Hz附近的相干性。在这种情况下，通常会在累积量密度函数中观察到振荡，且时滞为100 ms。两种模式可以在同一主题中观察到，但通常不会同时出现。与累积收缩密度函数中的中央波谷相关的10 Hz附近的相干性在弱弱期间比在强共收缩期间少见。相反，在15–35 Hz频带内具有相干性的中心峰在收缩较弱时往往最为常见。当收缩保持一定时间后，与中央谷的10Hz相干趋势就会发生。当缺血导致大直径传入者的感觉反馈受阻时，可以观察到两种模式。当在成对的TA和Sol EMG记录（19个受试者中的10个）中观察到在15-35 Hz频带内具有连贯性的中心峰时，在两个频带和两个肌肉的EMG活动之间也观察到了在相同频带上的耦合。从运动皮层的腿部区域记录的脑电活动。当观察到EMG记录的中心波谷和10 Hz附近的相干性（19位受试者中的8位）时，在8位受试者中有7位的EEG和EMG之间未观察到明显的相干性。在最后一个对象中，观察到大约10 Hz的相干性。提示这些发现表明存在两种不同的中央输入系统来拮抗踝运动神经元：一种输入在压抑拮抗剂时激活了一块肌肉，而另一种则同时激活了拮抗运动神经元。数据表明，至少后者的输入取决于运动皮层活动。

著录项

  • 来源
    《Experimental Brain Research》 |2002年第3期|282-292|共11页
  • 作者

    S. Hansen; N. L. Hansen; L. O. D. Christensen; N. T. Petersen; J. B. Nielsen;

  • 作者单位

    Division of Neurophysiology Department of Medical Physiology The Panum Institute University of Copenhagen;

    Division of Neurophysiology Department of Medical Physiology The Panum Institute University of Copenhagen;

    Division of Neurophysiology Department of Medical Physiology The Panum Institute University of Copenhagen;

    Division of Neurophysiology Department of Medical Physiology The Panum Institute University of Copenhagen;

    Division of Neurophysiology Department of Medical Physiology The Panum Institute University of Copenhagen;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Coherence; Co-contraction; Motor unit synchronization;

    机译：相干;共收缩;电机单元同步;

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