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首页> 外文期刊>The European Journal of Neuroscience >Obstacle stepping involves spinal anticipatory activity associated with quadrupedal limb coordination.
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Obstacle stepping involves spinal anticipatory activity associated with quadrupedal limb coordination.

机译：障碍物踩踏涉及与四足四肢协调相关的脊柱预期活动。

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Obstacle avoidance steps are associated with a facilitation of spinal reflexes in leg muscles. Here we have examined the involvement of both leg and arm muscles. Subjects walking with reduced vision on a treadmill were acoustically informed about an approaching obstacle and received feedback about task performance. Reflex responses evoked by tibial nerve stimulation were observed in all arm and leg muscles examined in this study. They were enhanced before the execution of obstacle avoidance compared with normal steps and showed an exponential adaptation in contralateral arm flexor muscles corresponding to the improvement of task performance. This enhancement was absent when the body was partially supported during the task. During the execution of obstacle steps, electromyographic activity in the arm muscles mimicked the preceding reflex behaviour with respect to enhancement and adaptation. Our results demonstrate an anticipatory quadrupedal limb coordination with an involvement of proximal arm muscles in the acquisition and performance of this precision locomotor task. This is presumably achieved by an up-regulated activity of coupled cervico-thoracal interneuronal circuits.
机译：避障步骤与腿部肌肉脊柱反射的促进有关。在这里，我们检查了腿部和手臂肌肉的参与程度。在跑步机上以弱视行走的对象会在听觉上得知正在接近的障碍物，并收到有关任务执行情况的反馈。在这项研究中，在所有手臂和腿部肌肉中都观察到了由胫神经刺激引起的反射反应。与正常步骤相比，它们在执行避障之前得到了增强，并显示了对侧臂屈肌的指数适应性，与任务绩效的提高相对应。当在任务期间部分地支撑身体时，这种增强是不存在的。在执行障碍物步骤期间，手臂肌肉的肌电图活动模仿了先前关于增强和适应的反射行为。我们的研究结果表明，预期的四足肢协调与近端手臂肌肉参与了这项精密运动任务的获取和执行。据推测，这是通过子宫颈-胸腔神经内耦合回路的上调活动来实现的。

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