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首页> 美国卫生研究院文献>The Journal of Physiology >Flexibility of lower limb reflex responses to painful cutaneous stimulation in standing humans: evidence of load-dependent modulation.
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Flexibility of lower limb reflex responses to painful cutaneous stimulation in standing humans: evidence of load-dependent modulation.

机译：下肢反射对站立的人的痛苦皮肤刺激的灵活性：负荷依赖性调节的证据。

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1. In six human subjects standing without support, the reflex response of the tibialis anterior muscle (TA) was elicited by painful electrical stimulation (500 Hz, 20 ms) of the anterior sole of the foot and analysed by post-stimulus averages of rectified electromyography. The threshold intensity for the reflex response was very close to the subjective pain sensation (mean value, 1.05 times). Estimation of the afferent conduction velocity gave a mean value of 26.5 m s-1, suggesting that a contribution from A delta fibres was necessary to evoke the reflex response. The TA reflex response was then used as the pain test reflex. 2. Changes in the TA excitatory pain reflex response (elicited at 1.2 times the pain threshold) were investigated while the subjects maintained different postures in upright stance. Standing on the ipsilateral leg produced a significant decrease in the reflex response with respect to its value in symmetrical stance (standing on both legs), whereas a significant facilitation was observed when the subject was standing on the contralateral leg. A parallel depression of the response in both limbs was present when the subject maintained an upright stance with the lower limbs abducted. Thus, it was apparent that the TA pain responses decreased as the supporting function of the leg increased. 3. A significant inverse correlation between the load to which the limb was subjected and the size of the reflex response was observed in all subjects. We propose that the load to which the limb is subjected, measured from peripheral mechanoreceptors, is used as a measure of the current supporting function of the limb, on the basis of which the reflex is regulated.
机译：1.在六名无支撑站立的人类受试者中，通过对脚前掌进行痛苦的电刺激（500 Hz，20 ms）引起胫骨前肌（TA）的反射反应，并通过矫正后的刺激后平均值进行分析。肌电图。反射反应的阈值强度非常接近主观疼痛感（平均值为1.05倍）。传入传导速度的估计给出了26.5 m s-1的平均值，这表明A三角洲纤维的贡献是诱发反射反应所必需的。然后将TA反射反应用作疼痛测试反射。 2.研究了TA兴奋性疼痛反射反应的变化（在疼痛阈值的1.2倍处引起），同时受试者保持了不同的站立姿势。站立在同侧腿上时，反射反应相对于其对称姿势的值（站立在两条腿上）明显降低，而当受试者站在对侧腿上时，观察到明显的促进作用。当受试者保持直立的姿势并绑住下肢时，在两个肢体中都出现了平行的反应压抑。因此，很明显，TA疼痛反应随着腿部支撑功能的增加而降低。 3.在所有受试者中均观察到肢体承受的负荷与反射反应大小之间的显着负相关。我们建议从周围的机械感受器测量肢体所承受的负荷，作为肢体当前支撑功能的量度，并在此基础上调节反射率。

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