Nakagawa Kento, Masugi Yohei, Saito Akira, Obata Hiroki, Nakazawa Kimitaka
Graduate School of Arts and Sciences, The University of Tokyo, Komaba, Meguro-ku, Tokyo, Japan; Japan Society for the Promotion of Science, Japan.
Institute of Sports Medicine and Science, Tokyo International University, Matoba, Kawagoe-shi, Saitama, Japan.
Neurosci Lett. 2018 Mar 6;668:55-59. doi: 10.1016/j.neulet.2018.01.015. Epub 2018 Jan 9.
The effects of motor imagery on spinal reflexes such as the H-reflex are unclear. One reason for this is that the muscles that can be used to record spinal reflexes are limited to traditional evoking methods Recently, transcutaneous spinal cord stimulation has been used for inducing spinal reflexes from multiple muscles and we aimed to examine the effect of motor imagery on spinal reflexes from multiple muscles. Spinal reflexes evoked by transcutaneous spinal cord stimulation were recorded from six muscles from lower limbs during motor imagery of right wrist extension and ankle plantarflexion with maximum isometric contraction. During both imaginary tasks, facilitation of spinal reflexes was detected in the ankle ipsilateral plantarflexor and dorsiflexor muscles, but not in thigh, toe or contralateral lower limb muscles. These results suggest that motor imagery of isometric contraction facilitates spinal reflex excitability in muscles of the ipsilateral lower leg and the facilitation does not correspond to the imaginary involved muscles.
运动想象对诸如H反射等脊髓反射的影响尚不清楚。造成这种情况的一个原因是，可用于记录脊髓反射的肌肉仅限于传统的诱发方法。最近，经皮脊髓刺激已被用于从多块肌肉诱发脊髓反射，我们旨在研究运动想象对多块肌肉脊髓反射的影响。在右腕伸展和踝关节跖屈的最大等长收缩运动想象过程中，从下肢的六块肌肉记录经皮脊髓刺激诱发的脊髓反射。在这两项想象任务中，在同侧踝关节跖屈肌和背屈肌中检测到脊髓反射的易化，但在大腿、脚趾或对侧下肢肌肉中未检测到。这些结果表明，等长收缩的运动想象可促进同侧小腿肌肉的脊髓反射兴奋性，且这种易化与想象所涉及的肌肉不对应。
