Ikeda Hiroki, Hayashi Tadateru, Honda Tetsumi, Yoshida Hiroaki
Department Rehabilitation, Iida Hospital: 1-15 Odori, Iida-shi, Nagano 395-8505, Japan.
Department of Science and Technology, Graduate School of Medicine, Science and Technology, Shinshu University, Japan.
J Phys Ther Sci. 2024 Oct;36(10):633-641. doi: 10.1589/jpts.36.633. Epub 2024 Oct 1.
[Purpose] The effects of multifunctional garments on neuromuscular performance have gained significant research attention in the health sciences. However, the spinal responses to different fabrics have not yet been considered. In the present study, we examined the effects of typical fabrics (cotton and polyester) on the Hoffmann reflex during local heat exposure. [Participants and Methods] Sixteen healthy males aged 20-40 years participated in this study. A heating device comprising a thermal mat, fabric, and a data logger was fabricated. The fabric was affixed to the skin as the contact surface. The temperature of the right posterior lower leg was increased to 39°C followed by 10 min for adaptation at 39-40°C. The H- and M-waves were recorded at each point, including those without heating. An identical trial was conducted seven days later using the alternative fabric. [Results] M-wave amplitude and latency were significantly decreased during heat exposure without fabric. The H-wave latency was prolonged by sustained thermal heat during the session with polyester. Interestingly, the H-wave amplitudes normalized by the maximal M-wave amplitudes decreased with prolonged heat exposure during the session with cotton. However, this index remains unchanged during the sessions using polyester. [Conclusion] During prolonged localized thermal exposure, cotton reduced spinal excitability, whereas polyester preserved spinal excitability.
[目的]多功能服装对神经肌肉性能的影响在健康科学领域已获得大量研究关注。然而，尚未考虑脊柱对不同织物的反应。在本研究中，我们研究了典型织物（棉和聚酯）在局部热暴露期间对霍夫曼反射的影响。[参与者与方法]16名年龄在20至40岁之间的健康男性参与了本研究。制作了一种由热垫、织物和数据记录器组成的加热装置。将织物作为接触表面固定在皮肤上。将右下肢后侧的温度升高至39°C，然后在39 - 40°C下适应10分钟。在每个点记录H波和M波，包括未加热时的情况。七天后使用另一种织物进行相同试验。[结果]在无织物热暴露期间，M波振幅和潜伏期显著降低。在使用聚酯的试验中，持续热暴露使H波潜伏期延长。有趣的是，在使用棉的试验中，随着热暴露时间延长，由最大M波振幅归一化的H波振幅降低。然而，在使用聚酯的试验中该指标保持不变。[结论]在长时间局部热暴露期间，棉降低了脊柱兴奋性，而聚酯保持了脊柱兴奋性。
