三伏天气温高,人体以较多的出汗来散发热量,故体内易缺水。老年人生理机能减退,对外环境的变化适应性差,应激性和耐受力也低,而其体内水分比年轻人少1/3,对口渴的反应比较迟钝,如得不到水分的及时补充,缺水将更加严重,最易“脱水”。 Three-day high temperature, the body to more sweat to distribute heat, so the body easy to water. Poor physiological function of the elderly, poor adaptability to changes in the external environment, stress and tolerance are also low, and the body of water less than 1/3 than the young, relatively slow response to thirst, such as lack of timely replenishment of water , Water shortage will be more serious, most likely to “dehydration.”