Facilitation between extensor carpi radialis and pronator teres in humans: A study using a post-stimulus time histogram method
Facilitation between extensor carpi radialis and pronator teres in humans: A study using a post-stimulus time histogram method
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DOI：
10.3109/08990220.2014.928615
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发表时间：
2014-12-01
影响因子：
0.9
通讯作者：
Naito, Akira
中科院分区：
文献类型：
--
作者：
Nakano, Haruki;Miyasaka, Takuji;Naito, Akira
I组肌肉传入通过兴奋性和抑制性脊髓反射调节运动神经元的兴奋性。各种肌肉对之间的脊髓反射关系在实验动物中得到了很好的描述，但在人类上肢中却没有，人类上肢表现出对运动的精细控制。在本研究中，脊髓反射之间的桡侧腕伸肌（ECR）和旋前圆肌（PT）肌肉检查健康人受试者使用刺激后时间直方图方法。电刺激的低阈值传入的ECR神经增加了运动神经元的兴奋性在31的76 PT运动单位（MU）在所有8个受试者测试，而刺激的低阈值传入的PT神经增加了运动神经元的兴奋性在36的102 ECR MU在所有10个科目。估计的中枢突触延迟几乎等同于homoprotein易化。机械刺激（MS）的ECR促进了16的30 PT MU在所有5个测试科目，而MS的PT促进了17的30 ECR MU在所有6个科目。这些结果表明PT和ECR之间存在兴奋性反射（易化）。第一组传入应介导的促进通过单突触路径。
Group I muscle afferents modulate the excitability of motor neurons through excitatory and inhibitory spinal reflexes. Spinal reflex relationships between various muscle pairs are well described in experimental animals but not in the human upper limb, which exhibits a fine control of movement. In the present study, spinal reflexes between the extensor carpi radialis (ECR) and pronator teres (PT) muscles were examined in healthy human subjects using a post-stimulus time histogram method. Electrical stimulation of low-threshold afferents of ECR nerves increased the motor neuron excitability in 31 of 76 PT motor units (MUs) in all eight subjects tested, while stimulation of low-threshold afferents of PT nerves increased the motor neuron excitability in 36 of 102 ECR MUs in all 10 subjects. The estimated central synaptic delay was almost equivalent to that of homonymous facilitation. Mechanical stimulation (MS) of ECR facilitated 16 of 30 PT MUs in all five subjects tested, while MS of PT facilitated 17 of 30 ECR MUs in all six subjects. These results suggest excitatory reflex (facilitation) between PT and ECR. Group I afferents should mediate the facilitation through a monosynaptic path.