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.

我们的目的是研究环境因素在运动过程中对耐热性的影响，并进行了以下三个实验。1。我们研究了中度运动后短腿冷却对心脏呼吸响应对随后在热量运动中的影响。在35℃（EX.1）处于40分钟的测量计循环（占O_2峰值的65％）之后，七个男性受试者将腿浸入35℃（对照条件：续）或20℃（冷却条件：冷却条件：冷却）5分钟，然后持续5分钟，然后重复循环（如前所述，但如前10分钟）（ex.2）（ex.2）。结果表明，在恢复期间短暂的腿部冷却可能有效地减少热量运动期间的热和心肺应变。2。我们研究了环境因素是否影响运动过程中的耐热性。有16名学生在热量和生理参数之间的关系，其家乡的登山者条件以及空调的使用情况下进行锻炼。他们的热耐受指数（例如汗水率和前臂皮肤血流的增加）之间的关系往往很大，这表明家乡的气候可能会影响学生的热耐受性。3。我们测试了以下假说：在热量延长的锻炼过程中，核心温度升高，不介导皮肤温度，降低了分钟通风的升高（VE）。 13个受试者在峰值计的峰值氧气量的50％上锻炼60分钟，同时在10°C（T10），35°C（T35）或45°C（T45）上搭配西装（T10）（T10）（T10）。结果表明，在热量延长的亚最大运动过程中，VE随着核心温度的增加，不受皮肤温度或核心温度升高的影响。