Effects of environmental factors on heat tolerance and mechanism underlining hyperthemic hyperventilation.

环境因素对耐热性的影响和高热过度通气的机制。

基本信息

批准号：
17300203
负责人：
HONDA Yasushi
金额：
$ 10.24万
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 (B)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

项目摘要

We aimed to investigate the effects of environmental factors on heat tolerance and to elucidate the mechanisms underlining the hyperthermic hyperventilation in humans.1. We tested the hypothesis that, in humans, hyperthermic hyperpnea elicited in resting subjects differs from that elicited during submaximal, moderate intensity exercise. It was suggested that hyperthermic hyperpnea does indeed differ depending upon whether one is at rest or exercising at submaximal, moderate intensity.2. We tested the hypothesis that, in humans, exercise-heat acclimation (6-days) changes the hyperthermic hyperpnea during exercise in the heat. It was suggested that heat acclimation does not affect the hyperthermic hyperpnea, although it markedly enhances the cutaneous vasodilatory response during exercise.3. We tested the hypothesis that hyperthermic hyperventilation in part reflects enhanced chemoreceptor ventilatory 0_2 drive, and that the resultant hypocapnia attenuates ventilatory responses and/or mi … More ddle cerebral artery mean blood velocity in resting humans. It was suggested that, in resting humans, although hyperthermia increases chemoreceptor ventilatory 0_2 drive, the relative contribution of the chemoreceptor ventilatory 0_2 drive to hyperthemic hyperventilation is small (〜20%) and unchanged with increasing core temperature, and hypocapnia induced by hyperthermic hyperventilation reduces cerebral blood flow but not ventilatory responses.4. We investigated whether the environmental factors affect the heat tolerance during exercise. Fourteen 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, increase rate of skin blood flow in the forearm, the increase rate of minute ventilation and the climate data were not significant, suggesting that the recent life style including air conditioning and exercise experience could override the effects of climate of the home town on the heat tolerance in the students. Less

我们的目的是研究环境因素对耐热性的影响，并阐明强调人类过度换气过度换气的机制1。我们检验了以下假设：在人类中，在与次最大的，中等强度运动中引起的静息受试者中引起的过度热肥大。有人提出，过度热的肥大确实确实有所不同，具体取决于一个人处于休息还是在次最大，中等强度下运动。2。我们检验了这样的假设，即在人类中，运动热的适应（6天）改变了热量运动过程中的过度热肥大。据建议，热适应不会影响过度热的过度，尽管它显着增强了运动过程中皮肤血管舒张反应的作用。3。我们检验了这样的假设，即热疗过度换气部分反映了增强的化学感受器通气0_2驱动器，并且所得的低碳酸盐可减轻通气反应和/或MI…更多的脑动脉平均血液速度。 It was suggested that, in resting humans, although hyperthermia increases chemoreceptor ventilation 0_2 drive, the relative contribution of the chemoreceptor ventilation 0_2 drive to hyperthemic hyperventilation is small (~20%) and unchanged with increasing core temperature, and hypocapnia induced by hyperthermic hyperventilation reduces cerebral blood flow but not ventilatory responses.4.我们研究了环境因素是否影响运动过程中的耐热性。 14名学生在热量中运动以及这些物理参数之间的关系，其家乡的气候条件以及空调的使用。其耐热指数（例如汗液率，增加前臂的皮肤血流速率）之间的关系，微小通风率的增加和气候数据不显着，这表明包括空调和运动经验在内的最近的生活方式可能会超越学生家庭城镇气候对学生的耐热性的影响。较少的