Thermoregulation, peripheral vessel vasomotor regulation, and hormonal responses during cold exposure in wheelchair athletes

轮椅运动员寒冷暴露期间的体温调节、外周血管舒缩调节和激素反应

• 批准号: 10680039
• 负责人: SUGAWARA Masashi
• 金额: $ 1.66万
• 依托单位: Nagasaki University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10680039/
• 关键词: wheelchair athlete; cold; hot; tympanic temperature; mean skin temperature; heat production; cold-induced vasodilation; catecholamine

The purpose of this study is to clarify the characteristics of thermoregulation and physiological responses during exercise in a cold and hot environment in wheelchair athletes with spinal cord injury. The subjects were male wheelchair athletes with spinal cord injury and healthy male college students. The maximal oxygen intake as a parameter of endurance exercise ability was higher in the wheelchair athletes than in the college students. Measurements were performed at an environmental temperature of 12℃ and 35℃ with a mean relative humidity of 60% at a mean air stream of 0.5m/sec. After rest for 30 minutes, the subjects performed arm cranking exercise at 20 watts(50 rpm) for 60 minutes. The measurement items were tympanic temperature, mean skin temperature, heat production, catecholamine, and cold-induced vasodilation.During exercise under exposure to cold, the tympanic temperature, heat production, and catecholamine more markedly increased in the wheelchair athletes than in the college students. The resistance index as a value of cold-induced vasodilation were higher in the wheelchair athletes than college students during cold exposure. On the other hand, the decrease in the mean skin temperature was slighter in the wheelchair athletes than in the college students. The thermoregulation sensitivity and heat production responses to exercise in a cold environment were more markedly increased in the wheelchair athletes than in the college students.During exercise under exposure to heat, the tympanic temperature, mean skin temperature, heat production, and catecholamine more markedly increased in the wheelchair athletes than in the college students. The thermoregulation sensitivity and heat production responses to exercise in a hot environment were lower in the wheelchair athletes than in the college students. These results suggested that spinal cord injury considerably affects thermoregulation during exercise in a hot environment.

本研究旨在探讨脊髓损伤轮椅运动员在冷热环境下运动时体温调节及生理反应的特点。研究对象为患有脊髓损伤的男性轮椅运动员和健康男性大学生。最大摄氧量作为耐力运动能力的指标，轮椅运动员高于大学生。在12℃和35℃的环境温度下进行测量，平均相对湿度为60%，平均气流为0.5 m/s。在休息30分钟后，受试者以20瓦（50 rpm）进行手臂摇动运动60分钟。测试项目为鼓膜温度、平均皮肤温度、产热、儿茶酚胺及冷诱导血管扩张，在寒冷环境下运动时，轮椅运动员的鼓膜温度、产热及儿茶酚胺较大学生显著升高。在冷暴露过程中，轮椅运动员的血管阻力指数高于大学生。另一方面，轮椅运动员的平均皮肤温度的下降幅度比大学生小。轮椅运动员对冷环境运动的体温调节敏感性和产热反应比大学生明显增加，在热暴露条件下运动时，轮椅运动员的鼓膜温度、平均皮肤温度、产热和儿茶酚胺的增加比大学生明显。轮椅运动员对热环境运动的体温调节敏感性和产热反应均低于大学生。这些结果表明，脊髓损伤显着影响在热环境中运动时的体温调节。