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首页> 外文期刊>The European Journal of Neuroscience >Facilitation of spinal reflexes assists performing but not learning an obstacle-avoidance locomotor task.
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Facilitation of spinal reflexes assists performing but not learning an obstacle-avoidance locomotor task.

机译：促进脊柱反射有助于执行但不能学习避免障碍的运动任务。

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摘要

The aim of this study was to investigate spinal reflex (SR) modulation during the performance and learning of a precision locomotor task. Healthy subjects had to minimize foot clearance when repeatedly stepping on a treadmill over a randomly approaching obstacle. The subjects walked with reduced vision and were informed about the approaching obstacle and task performance by acoustic warning and feedback signals, respectively. SRs were randomly evoked by tibial nerve stimulation (with non-nociceptive and nociceptive stimulus intensity) during the mid-stance phase in both normal and pre-obstacle stepping. Foot clearance and electromyographic activity of the tibialis anterior and biceps femoris muscles of the right leg were analysed. Only if a delay was introduced between warning signal and nerve stimulation, was the SR amplitude in both muscles enhanced prior to obstacle steps compared with normal steps for both stimulus intensities. Thus, the reflex enhancement depended on the subject's awareness of theapproaching obstacle. Improved performance was reflected in a decreased foot clearance, but did not correlate with the course of SR amplitude. It is concluded that obstacle stepping is associated with a facilitation of SR pathways, probably by supraspinal drive. This facilitation might provide assistance in safe obstacle stepping, e.g. to compensate quickly if resistance is encountered.
机译：这项研究的目的是研究在执行和学习精确运动任务期间的脊髓反射（SR）调制。健康的受试者在跑步机上反复踩踏随机接近的障碍物时，必须将脚部间隙最小化。受试者走路时视力减退，并分别通过声音警告和反馈信号获悉正在接近的障碍物和任务表现。在正常和障碍物踩踏前的中位阶段，通过胫神经刺激（非伤害性和伤害性刺激强度）随机诱发SR。分析了右腿胫前肌和股二头肌的足部清除率和肌电活动。只有在警告信号和神经刺激之间引入延迟后，与两种刺激强度的正常步幅相比，障碍步之前的两条肌肉的SR振幅才会增强。因此，反射增强取决于对象对接近障碍物的认识。脚间隙的减小反映出性能的提高，但与SR振幅的变化过程无关。结论是，障碍物的踩踏与SR通路的促进有关，可能是通过脊髓上驱动。这种便利可以为安全的障碍物踩踏提供帮助，例如如果遇到阻力，可以迅速进行补偿。

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