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首页> 外文期刊>Human physiology >Reaction to the Perturbation of the Vertical Posture under Different Conditions of Standing and in the Case of Additional Support
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Reaction to the Perturbation of the Vertical Posture under Different Conditions of Standing and in the Case of Additional Support

机译：在不同站立状态和额外支撑下对垂直姿势摄动的反应

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摘要

The reaction of equilibrium restoration in response to the perturbation of the vertical posture of a subject standing on a stable or unstable support was studied. Perturbation was induced by a sudden forward or backward shift of the support surface. In some of the experiments, the subject was holding onto a handrail suspended on a long soft belt with a fixed upper end. The results of the study showed that the reaction to support movement depended on the direction of the perturbation. The soleus muscle was activated first upon a backward movement, and the anterior tibial muscle was activated first upon a forward movement, with a latency of about 50 ms. Within 30-70 ms, bursts of activity were also detected in the respective antagonist muscles. Sudden movement of the platform caused bursts of impulses in the arm muscles even in the absence of contact with the handrail. These impulse bursts had a longer latency (80-130 ms) and probably played an auxiliary role in the process of the restoration of balance. In the case of standing on an unstable support, the latency of leg muscle activation increased. When a subject was holding onto a handrail, the intensity of impulse bursts decreased in the leg muscles and increased in the arm muscles, while the latent periods of the bursts in the arm muscles decreased. This effect proved to be still more pronounced in the case of balance maintenance on an unstable support. Thus, the change in the response to external perturbations during maintenance of the vertical posture on an unstable support demonstrates that an additional contact of the hand changes the adjustment of the posture control system.
机译：研究了平衡恢复对站立在稳定或不稳定支撑物上的对象的垂直姿势的扰动的反应。支撑表面突然向前或向后移动会引起摄动。在某些实验中，受试者被握在扶手上，该扶手悬挂在一条长软带上，固定在上端。研究结果表明，支持运动的反应取决于扰动的方向。比目鱼肌在向后运动时首先被激活，胫骨前肌在向前运动时被首先激活，潜伏期约为50 ms。在30-70毫秒内，在相应的拮抗肌中也检测到爆发性的活动。即使没有与扶手接触，平台的突然移动也会在手臂肌肉中产生脉冲。这些脉冲爆发的等待时间较长（80-130毫秒），可能在恢复平衡过程中起到了辅助作用。在站立在不稳定的支撑物上的情况下，腿部肌肉激活的潜伏期增加。当受试者握住扶手时，腿部肌肉的冲动爆发强度降低，而臂部肌肉的冲动爆发强度增加，而臂部肌肉爆发的潜伏期减少。事实证明，在不稳定支撑上保持平衡的情况下，这种效果更加明显。因此，在保持不稳定的支撑件上的垂直姿势期间对外部干扰的响应的变化表明手的附加接触改变了姿势控制系统的调节。

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  • 来源
    《Human physiology》 |2009年第2期|170-176|共7页
  • 作者

    O. V. Kazennikov; V. Yu. Shlykov; Yu. S. Levik;

  • 作者单位

    Kharkevich Institute for Information Transmission Problems, Russian Academy of Sciences, Moscow, 127994 Russia;

    Kharkevich Institute for Information Transmission Problems, Russian Academy of Sciences, Moscow, 127994 Russia;

    Kharkevich Institute for Information Transmission Problems, Russian Academy of Sciences, Moscow, 127994 Russia;

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