Takasaki Hirokazu, Asai Hitoshi, Suehiro Kenji, Ishihama Takashi, Suzuki Toshiaki
Department of Rehabilitation, Kyoto Tanabe Central Hospital: 6-1-6 Tanabe Chuo, Kyotanabe City, Kyoto 610-0334, Japan.
Division of Health Sciences, Graduate School of Medical Sciences, Kanazawa University, Japan.
J Phys Ther Sci. 2024 Dec;36(12):797-802. doi: 10.1589/jpts.36.797. Epub 2024 Dec 1.
[Purpose] This study investigated the excitability of spinal nerve function in healthy participants by asking them to imagine raising and lowering their heels in a standing position while varying the timing of stimulation to induce an H-reflex from the soleus muscle during imagery. [Participants and Methods] Participants were instructed to begin their imagery at the fourth metronome sound and imagine that their heels would be maximally raised at the time of the optical signal, which occurred 1,000 ms after the metronome sound; moreover, they would be standing at the metronome sound 1,000 ms later. They were instructed to perform the imagery 21 consecutive times. The timing of the electrical stimulation was set for five conditions: 0, 200, 400, 600, and 800 ms after the metronome sound. [Results] Amplitude H/Mmax ratios were significantly higher at the 0, 200, 400, and 600 ms conditions than in the resting and 800 ms conditions. [Conclusion] The imagery task has the potential to increase the excitability of spinal nerve function from 0 ms to 600 ms after a metronome sound but then decrease it to the resting state at 800 ms.
[目的]本研究通过让健康参与者在站立位想象抬起和放下脚跟，并在想象过程中改变刺激时机以诱发比目鱼肌的H反射，来研究脊髓神经功能的兴奋性。[参与者与方法]参与者被指示在节拍器发出第四声时开始想象，并想象在节拍器声音后1000毫秒出现的光信号出现时，他们的脚跟将最大限度地抬起；此外，他们将在节拍器声音后1000毫秒时保持站立。他们被要求连续进行21次想象。电刺激的时机设置为五种情况：节拍器声音后0、200、400、600和800毫秒。[结果]在0、200、400和600毫秒的情况下，H/Mmax比值的幅度显著高于静息状态和800毫秒的情况。[结论]想象任务有可能在节拍器声音后0毫秒至600毫秒内增加脊髓神经功能的兴奋性，但在800毫秒时降至静息状态。
