Hosseinlou Abdollah, Khamnei Saeed, Zamanlu Masumeh
Faculty of Medicine, Urmia University of Medical Sciences Urmia, Iran.
Int J Clin Exp Med. 2013 Sep 1;6(8):683-7. eCollection 2013.
During heat stress and dehydration, thermoregulation is partly suppressed to save body fluid and circulation. Drinking induces the recovery of thermoregulatory responses including sweating. Our objective is to investigate the effect of water temperature and voluntary drinking on the extent of the drinking-induced sweating. Six healthy subjects 23.7 ± 0.6 yr old and 80.7 ± 5.7 kg wt were dehydrated by performing mild exercise (ergometer cycling) in a hot and humid chamber (38-40°C, 20-28% relative humidity). After dehydration, subjects were allowed to drink water with temperatures of 5, 16, 26, 58°C on four separate days. The sweating rate was measured on the forehead area before and after drinking. Also, blood samples were collected during the experiments and plasma osmolality was measured. Sweating increased markedly just a few minutes after the onset of drinking. The rate of this response was lower in ingested water temperature of 5°C (0.43 ± 0.03 g, p = 0.000). Different intake occurred with different water temperatures (respectively 4.2, 6.4, 3.1, 1.8 ml/kg). Water at 16°C induced higher intake (6.4 ml/kg) together with lower sweating (0.54 ± 0.03 g), which can result in optimum level of hydration. Conclusion- When dehydrated subjects drink water with different temperatures, there are different sweating responses together with different voluntary intakes. According to our results, consuming 16°C water, cool tap water, could be suggested in dehydration.
在热应激和脱水期间，体温调节会部分受到抑制以节省体液和维持循环。饮水可促使包括出汗在内的体温调节反应恢复。我们的目的是研究水温及自主饮水对饮水诱发出汗程度的影响。六名健康受试者，年龄23.7±0.6岁，体重80.7±5.7千克，在炎热潮湿的房间（38 - 40°C，相对湿度20 - 28%）中通过轻度运动（测力计骑行）使其脱水。脱水后，让受试者在四个不同日期分别饮用温度为5、16、26、58°C的水。在饮水前后测量前额部位的出汗率。此外，在实验过程中采集血样并测量血浆渗透压。饮水开始后几分钟出汗明显增加。摄入水温为5°C时这种反应的速率较低（0.43±0.03克，p = 0.000）。不同水温的饮水量不同（分别为4.2、6.4、3.1、1.8毫升/千克）。16°C的水摄入量较高（6.4毫升/千克）且出汗较少（0.54±0.03克），这可导致最佳的水合水平。结论——脱水受试者饮用不同温度的水时，出汗反应不同，自主饮水量也不同。根据我们的结果，脱水时建议饮用16°C的水，即凉自来水。
