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首页> 美国卫生研究院文献>Springer Open Choice >Does Cold Water or Ice Slurry Ingestion During Exercise Elicit a Net Body Cooling Effect in the Heat?
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Does Cold Water or Ice Slurry Ingestion During Exercise Elicit a Net Body Cooling Effect in the Heat?

机译：运动过程中摄入冷水或冰浆是否会在热中引起净身体冷却作用？

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摘要

Cold water or ice slurry ingestion during exercise seems to be an effective and practical means to improve endurance exercise performance in the heat. However, transient reductions in sweating appear to decrease the potential for evaporative heat loss from the skin by a magnitude that at least negates the additional internal heat loss as a cold ingested fluid warms up to equilibrate with body temperature; thus explaining equivalent core temperatures during exercise at a fixed heat production irrespective of the ingested fluid temperature. Internal heat transfer with cold fluid/ice is always 100% efficient; therefore, when a decrement occurs in the efficiency that sweat evaporates from the skin surface (i.e. sweating efficiency), a net cooling effect should begin to develop. Using established relationships between activity, climate and sweating efficiency, the boundary conditions beyond which cold ingested fluids are beneficial in terms of increasing net heat loss can be calculated. These conditions are warmer and more humid for cycling relative to running by virtue of the greater skin surface airflow, which promotes evaporation, for a given metabolic heat production and thus sweat rate. Within these boundary conditions, athletes should ingest fluids at the temperature they find most palatable, which likely varies from athlete to athlete, and therefore best maintain hydration status. The cooling benefits of cold fluid/ice ingestion during exercise are likely disproportionately greater for athletes with physiological disruptions to sweating, such as those with a spinal cord injury or burn injuries, as their capacity for skin surface evaporative heat loss is much lower; however, more research examining these groups is needed.
机译：运动期间摄入冷水或冰浆似乎是提高耐高温运动耐力的有效方法。但是，出汗的短暂减少似乎会减少皮肤蒸发性热散失的可能性，其程度至少可以抵消额外的内部热散失，因为冷食的液体会变暖以达到与体温平衡的水平。因此，解释了在固定热量产生的运动过程中等效的核心温度，与摄入的液体温度无关。使用冷流体/冰进行内部传热总是100％有效；因此，当汗水从皮肤表面蒸发的效率（即出汗效率）降低时，应该开始产生净的冷却效果。利用活动，气候和出汗效率之间的已建立关系，可以计算出边界条件，冷摄入液体在边界条件上有利于增加净热损失。相对于跑步而言，这些条件相对于跑步而言更温暖和更潮湿，这是因为对于给定的代谢热量产生和因此出汗率而言，皮肤表面更大的气流促进了蒸发。在这些边界条件下，运动员应以他们认为最可口的温度摄入液体，这可能因运动员而异，因此最好保持水分状态。对于生理上会出汗的运动员（例如脊髓损伤或烧伤的运动员），运动过程中冷饮水/冰的冷却益处可能会成比例地增加，因为他们的皮肤表面蒸发热损失能力低得多；但是，需要更多研究这些群体的研究。

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