Bradnam L, Rochester L, Vujnovich A
School of Physiotherapy, Faculty of Health Studies, Auckland University of Technology, New Zealand.
Electromyogr Clin Neurophysiol. 2000 Jul-Aug;40(5):259-66.
The excitability of the Flexor Carpi Radialis alpha-motoneuron pool following manual cervical traction was assessed in twenty asymptomatic subjects, and compared to a hands only intervention. The excitability of the alpha-motoneuron pool was measured indirectly using the Hoffmann (H) reflex. H-reflex recruitment curves were taken to assess the number of alpha-motoneurons (alpha-motoneurons) firing in response to a given incremental increase in stimulation intensity. The rate of rise of the slope of the H-reflex recruitment curve (Hslp) was assessed using linear regression. Following manual cervical traction Hslp was significantly lower than pre-intervention trials. Manual cervical traction, therefore, reduced the excitability of the Flexor Carpi Radialis alpha-motoneuron pool. This effect was mediated by the central nervous system. There was no significant decrease in alpha-motoneuron excitability following the hands only intervention. Hslp was shown to be a more sensitive measure of changes in the H-reflex than the more traditional parameter of Hmax/Mmax ratio and should be used in future studies of this nature.
在20名无症状受试者中评估了手动颈椎牵引后桡侧腕屈肌α运动神经元池的兴奋性，并与仅手部干预进行比较。使用霍夫曼（H）反射间接测量α运动神经元池的兴奋性。采用H反射募集曲线来评估随着刺激强度的给定增量增加而放电的α运动神经元数量。使用线性回归评估H反射募集曲线斜率（Hslp）的上升速率。手动颈椎牵引后，Hslp显著低于干预前试验。因此，手动颈椎牵引降低了桡侧腕屈肌α运动神经元池的兴奋性。这种效应由中枢神经系统介导。仅手部干预后，α运动神经元兴奋性没有显著降低。结果表明，与更传统的Hmax/Mmax比值参数相比，Hslp是一种更敏感的H反射变化测量指标，应在今后此类性质的研究中使用。
