Imai Ryota, Osumi Michihiro, Ishigaki Tomoya, Morioka Shu
Department of Neurorehabilitation, Graduate School of Health Science, Kio University, Japan.
Department of Rehabilitation, Kawachi General Hospital, Japan.
J Phys Ther Sci. 2017 Jul;29(7):1236-1241. doi: 10.1589/jpts.29.1236. Epub 2017 Jul 15.
[Purpose] It has also been reported that decreased activity in the reward pathway causes a decrease in brain activity in the descending pain control system in people with high trait anxiety. Activation of this system is dependent on both the reward pathway and motor areas. Recently, studies have also shown that motor areas are activated by illusory kinesthesia. It was aimed to explore whether anxiety trait modulates the influence of illusory kinesthesia on pain threshold. [Subjects and Methods] The pain threshold and trait anxiety at rest before vibratory tendon stimulation (the task) were measured. After the task, the pain threshold, the illusory kinesthesia angle, and the intensity of illusory kinesthesia for patients with and without illusory kinesthesia were measured. A total of 35 healthy right-handed students participated, among whom 22 and 13 were included in the illusion and no-illusion groups, respectively. [Results] There was a significant increase in the pain threshold after task completion in both groups; however, there was no statistically significant difference between the two groups. Correlational analysis revealed that State-Trait Anxiety Inventory-trait score correlated negatively with the pain threshold in the no-illusion group, but there was no correlation in the illusion group. [Conclusion] The pain threshold improved regardless of the size of trait anxiety in the illusion group, but did not improve merely through sensory input by vibratory stimulation in the no-illusion group. Thus, illusory kinesthesia has effect of increasing the pain threshold.
[目的] 也有报道称，在特质焦虑水平高的人群中，奖赏通路活动的降低会导致下行疼痛控制系统的大脑活动减少。该系统的激活依赖于奖赏通路和运动区域。最近，研究还表明，运动区域会被虚幻运动觉激活。本研究旨在探讨特质焦虑是否会调节虚幻运动觉对痛阈的影响。[对象与方法] 测量了振动肌腱刺激（任务）前静息状态下的痛阈和特质焦虑。任务结束后，测量了有或没有虚幻运动觉的患者的痛阈、虚幻运动觉角度和虚幻运动觉强度。共有35名健康的右利手学生参与，其中22名和13名分别被纳入虚幻运动觉组和无虚幻运动觉组。[结果] 两组在任务完成后痛阈均显著提高；然而，两组之间无统计学显著差异。相关性分析显示，在无虚幻运动觉组中，状态-特质焦虑量表-特质得分与痛阈呈负相关，但在虚幻运动觉组中无相关性。[结论] 在虚幻运动觉组中，无论特质焦虑程度如何，痛阈均有所改善，但在无虚幻运动觉组中，痛阈并非仅通过振动刺激的感觉输入而改善。因此，虚幻运动觉具有提高痛阈的作用。
