Why does hot weather make you tired 为什么炎热天气使你疲倦？ Your body is using a lot of energy to maintain its internal temperature of 37 degrees Celsius. 你的身体正在使用大量的能量来维持其内部温度37摄氏度。 Blood vessels dilate so that more warm blood can flow closer to the surface of the skin to lose heat, which is why some people’s faces turn red temporarily. You also sweat more, which cools the skin as it evaporates, but in order to do this your heart pumps faster and your metabolic rate (and therefore the number of calories your body needs) also increases. All this extra work can leave you feeling tired, and dehydration can only make it worse as your body loses water through perspiration 血管扩张使更多的温暖的血液流到皮肤表面，从而失去热量，这就是为什么有些人的脸会暂时变红。出汗越多，皮肤就越凉快，但为了做到这一点，你的心脏泵速度更快，你的新陈代谢率（因此你的身体所需的卡路里数量）也会增加。所有这些额外的工作会让你感到疲倦，而脱水只会让你的身体因为出汗失去水分而变得更糟。”
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