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Effects of environmental factors on heat tolerance during exercise.

环境因素对运动过程中耐热性的影响。

基本信息

批准号：
15500428
负责人：
HONDA Yasushi
金额：
$ 1.98万
依托单位：
University of Tsukuba
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

项目摘要

We aimed to investigate the effects of environmental factors on heat tolerance during exercise and conducted the following three experiments.1.We investigated the effects of brief leg cooling after moderate exercise on the cardiorespiratory responses to subsequent exercise in the heat. Following 40 min of ergometer cycling (65% of peak O_2 uptake) at 35℃ (Ex.1), seven male subjects immersed their legs in 35℃ (control condition:CONT) or 20℃ (cooling condition:COOL) water for 5 min and then repeated the cycling (as before, but for 10 min) (Ex.2). The results suggest that brief leg cooling during the recovery period may be effective at reducing thermal and cardiorespiratory strain during subsequent exercise in the heat.2.We investigated whether the environmental factors affect the heat tolerance during exercise. Sixteen students exercised in the heat and the relationships among those physiological parameters, the climate conditions of their home towns and the usage of air-conditioner. The relationships between their heat tolerance index such as the sweat rate and increase rate of skin blood flow in the forearm and the climate data tend to be significant, suggesting the climate of the home town could affect the heat tolerance in the students.3.We tested the hypothesis that during prolonged exercise in the heat, an increase in core temperature, not skin temperature, mediates an increase in minute ventilation (VE). Thirteen subjects exercised for 60 min on a cycle ergometer at 50% of peak oxygen uptake while wearing a suit per fused with water at 10℃ (T10), 35℃ (T35) or 45℃ (T45). The results suggest that during prolonged sub-maximal exercise in the heat, VE increases with core temperature and is unaffected by skin temperature or the rate at which core temperature increases.

本研究旨在探讨环境因素对运动中热耐力的影响，并进行了以下三个实验：1.研究中等强度运动后短暂的腿部降温对热环境下运动心肺反应的影响。7名男性受试者在35℃下进行40分钟的测力计循环（峰值O_2摄取量的65%）（例1）后，将腿浸入35℃（对照条件：CONT）或20℃（冷却条件：COOL）水中5分钟，然后重复循环（与前相同，但为10分钟）（例2）。结果表明，在恢复期进行短暂的腿部降温可以有效地降低热负荷运动时的热负荷和心肺负荷。2.研究了环境因素对运动耐热性的影响。16名学生在高温下进行锻炼，并研究这些生理参数与家乡气候条件和空调使用情况之间的关系。研究结果表明：（1）在高温条件下进行长时间运动时，每分钟通气量（VE）的增加是由中心体温的升高而不是皮肤温度的升高引起的。13名受试者穿着与10℃（T10）、35℃（T35）或45℃（T45）的水融合的防护服，在50%峰值摄氧量下在自行车测力计上运动60 min。结果表明，在长时间的次最大的运动在热，VE增加与核心温度和不受皮肤温度或核心温度增加的速度。