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Studies of physiological responses of thermoregulation, skin blood flow, osmolality, and catecholamine during exercise in wheelchair athletes in a hot environment

炎热环境下轮椅运动员运动过程中体温调节、皮肤血流、渗透压和儿茶酚胺生理反应的研究

基本信息

批准号：
13680034
负责人：
SUGAWARA Masashi
金额：
$ 2.24万
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：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

项目摘要

This study was carried out to clarify characteristics of responses of thermoregulation and other physiological responses in wheelchair athletes with spinal cord injury during exercise in a hot environment. Evaluations were made in a climatic chamber at a moderate exercise intensity and during actual training (field). The subjects were 5 wheelchair marathon racers (MG), 5 wheelchair basketball players (BG), and 5 healthy male college students (SG). The measurements were performed between late July and mid-October. In the climatic chamber, the subjects exercised on an arm cranking ergometer at 60% VO2max for 60 minutes after a 60-minute rest at a room temperature of 35℃ and a relative humidity of 60%. In the field, the subjects of Group MG drove the wheelchair at a mean speed of 35 km/h for 90 minutes in a 2-km outdoor course, those of Group BG performed routine practice for 90 minutes in the gymnasium, and those of Group SG performed 90-minute running. The WBGT (wet bulb globe temperature) in the field was 29.40-34.91℃. The subjects was allowed free access to a sports beverrage during the exercise. The items measured were heart rate, mean skin temperature, sweat loss, skin blood flow, tympanic temperature, blood lactate, osmolality and adrenaline, noradrenaline, and dopamine.The sensitivity of thermoregulation during exercise was lower in the wheelchair athletes than in normal college students in the climatic chamber and outdoor and indoor exercise situations, probably because spinal cord injury has a considerable effect on thermoregulation during exercise in a hot environment. When wheelchair athletes exercise in a hot environment, special precautions such as a sufficient fulid intake and avoiding hot hours are recommended to avoid heatstroke.

本研究旨在阐明轮椅脊髓损伤运动员在高温环境下运动时的体温调节及其他生理反应特征。评估是在适度运动强度的气候室和实际训练（现场）中进行的。研究对象为5名轮椅马拉松运动员（MG）、5名轮椅篮球运动员（BG）和5名健康男大学生（SG）。测量是在7月下旬至10月中旬进行的。在气候室内，受试者在室温35℃、相对湿度60%的条件下休息60分钟后，在手臂曲柄测力仪上以60%最大摄氧量进行60分钟的运动。在野外，MG组受试者以平均35 km/h的速度在2 km的户外赛道上驾驶轮椅90分钟，BG组受试者在健身房进行90分钟的常规练习，SG组受试者进行90分钟的跑步。田间湿球温度（WBGT）为29.40 ~ 34.91℃。实验期间，受试者可以自由饮用运动饮料。测量的项目包括心率、平均皮肤温度、出汗量、皮肤血流量、鼓室温度、血乳酸、渗透压和肾上腺素、去甲肾上腺素和多巴胺。在气候室和室内外运动条件下，轮椅运动员运动时的体温调节敏感性低于普通大学生，这可能是因为脊髓损伤对高温环境下运动时的体温调节有相当大的影响。当轮椅运动员在炎热的环境中运动时，建议采取特别的预防措施，如摄入足够的液体和避免炎热的时间，以避免中暑。