Bipedal reflex coordination to tactile stimulation of the sural nerve during human running.
Bipedal reflex coordination to tactile stimulation of the sural nerve during human running.
复制标题
人体跑步过程中双足反射协调腓肠神经的触觉刺激。
DOI：
10.1152/jn.1995.73.5.1947
复制
发表时间：
1995
影响因子：
2.5
通讯作者：
V. Dietz
中科院分区：
文献类型：
--
作者：
A. Tax;B. V. Wezel;V. Dietz
1.人类在跑步机上跑步（8公里/小时）时，通过电刺激脚踝处的腓肠神经引发皮肤反射反应。在步骤周期的 16 个阶段中，以三种非伤害性强度（分别为感知阈值 (PT) 的 1.5、2.0 和 2.5 倍）提供刺激序列（200 Hz、1 ms 的 5 个脉冲）。对于 11 名受试者，记录了同侧和对侧股二头肌长头（分别为 iBF 和 cBF）、半腱肌（iST 和 cST）、股直肌（iRF 和 cRF）以及胫骨前肌（iTA 和 cTA）的表面肌电 (EMG) 活动。 2. 在人类跑步过程中，非伤害性腓肠神经刺激似乎足以引发大范围、广泛且具有统计显着性的反射反应，其潜伏期约为 80 毫秒，持续时间约为 30 毫秒。这些反射反应似乎是人类运动的基本属性。这通过所有受试者中反应的发生、受试者之间大多数反射模式的一致性以及除了少量的习惯之外，在实验过程中反应的再现性来表明。 3. 在整个步周期中连续调节反应，使得它们的大小通常不与背景运动活动共变。这一现象在 iST、iTA 和 cTA 中观察得最为清楚，其中显示了统计学上显着的反射逆转，而在 cRF 和 cTA 中，其响应在大部分步骤周期期间被门控。 4.响应幅度通常随着强度的增加而增加，而相位相关的反射调制与强度无关。 5. 证明了同侧腘绳肌内的功能分离：在步循环中协同背景运动活动期间，iBF 和 iST 显示出拮抗反射模式（分别是促进性反射和抑制性反射）。然而，相反，cBF 和 cST 在这些时期作为密切的协同剂被反射性地激活。 6.两条腿的同源肌肉的反射反应及其相位依赖性调节是不同的。然而，我们还是观察到了一些相似之处。这些是相对于相应腿的相位而不是相对于受刺激腿的相位而存在的。两项观察结果表明，相位依赖的反射调制是在同侧和对侧腿中分别控制的。 7. 所有研究的肌肉的反应同时性支持人类跑步过程中协调皮肤肢体间反射的概念。（摘要截断为 400 字）
1. Cutaneous reflex responses were elicited during human running (8 km/h) on a treadmill by electrical stimulation of the sural nerve at the ankle. Stimulus trains (5 pulses of 1 ms at 200 Hz) at three nonnociceptive intensities, which were 1.5, 2.0, and 2.5 times perception threshold (PT), were delivered at 16 phases of the step cycle. For 11 subjects the surface electromyographic (EMG) activity of both the ipsilateral and contralateral long head of the biceps femoris (iBF and cBF, respectively), the semitendinosus (iST and cST), the rectus femoris (iRF and cRF), and the tibialis anterior (iTA and cTA) were recorded. 2. During human running nonnociceptive sural nerve stimulation appears to be sufficient to elicit large, widespread and statistically significant reflex responses, with a latency of approximately 80 ms and a duration of approximately 30 ms. These reflex responses seem to be an elementary property of human locomotion. This is indicated by the occurrence of the responses in all subjects, the consistency of most of the reflex patterns across the subjects and, apart from a small amount of habituation, the reproducibility of the responses during the course of the experiment. 3. The responses are modulated continuously throughout the step cycle such that their magnitude does not in general covary with the background locomotor activities. This is observed most clearly in iST, iTA, and cTA for which statistically significant reflex reversals are demonstrated, and in cRF and cTA for which the responses are gated during most of the step cycle. 4. The response magnitude generally increases as a function of increasing intensity, whereas the phase-dependent reflex modulation is intensity independent. 5. A functional dissociation within the ipsilateral hamstring muscles is demonstrated: the iBF and iST show an antagonistic reflex pattern (facilitatory and suppressive, respectively) during the periods of synergistic background locomotor activity in the step cycle. Contralaterally, however, the cBF and cST are reflexively activated as close synergists during these periods. 6. The reflex responses and their phase-dependent modulation are different for the homologous muscles in the two legs. Yet, some similarities are observed. These are present rather with respect to the phase of the corresponding leg than with respect to the phase of the stimulated leg. Both observations suggest that the phase-dependent reflex modulation is controlled separately in the ipsilateral and contralateral legs. 7. The response simultaneity in all investigated muscles supports the notion of a coordinated cutaneous interlimb reflex during human running.(ABSTRACT TRUNCATED AT 400 WORDS)