随着气温不断升高,人们已经明显感觉到夏天的燥热。尤其是进入伏天,常常是一身大汗。贪图凉快,从头到脚冲个冷水澡,当时感觉很畅快,可事后很可能会感到浑身乏力,有的甚至会出现头痛。这是因为身体在大量出汗的时候,毛细血管是处于扩张状态的,如果冲冷水澡,血管急剧收缩,体内热 As temperatures have risen, people have clearly felt the heat of the summer. Especially into ambushes, often a sweat. In an attempt to cool, a cold shower from head to foot, then feel very carefree, but may feel tired afterwards, and some even have headaches. This is because the body is in a lot of sweating when the capillaries are in an expansion state, if the cold shower, the blood vessels contracted sharply, the body heat