暑假期间，很多同
                                                                                                                          学会参加体育运动。大
                                                                                                                          量活动后出了很多汗，又
                                                                                                                        热又渴的你会怎么做？喝冷
                                                                                                                      饮？吃冷食？冲凉水澡？
                                                                                                                    NO！这些对身体伤害都很大，
                                                                                                                  听悦悦姐姐来告诉你。
                                                                                                                  在高温环境下，活动会使身体大量
                                                                                                          出汗，汗液蒸发排泄不畅，容易造成人体热量
                                                                                                    不能及时散发，使身体维持热平衡的功能受到阻碍，
                                                                                          这时就会发生中暑。预防中暑，最重要的是避免过度劳累，并
                                                                                      及时补充水分和盐分。一旦出现头晕眼花、恶心等中暑先兆，要停
                                                                                      止活动，告诉在场的大人，如有需要立即到医院救治。
                                                                                          大量出汗后急需降温，很多同学选择喝冷饮，这对身体是极为不利
                                                                                      的。在高温环境中，皮肤、肌肉、心脏等处的血管更加舒张，但腹腔内脏的
                                                                                      血管处于收缩状态，此时胃肠道吸收能力很差。冷饮容易造成胃的幽门
                                                                                      关闭，致使大量的水分积存在胃内，让人感到胃部胀满不适或疼痛。
                                                                                          喝冷饮时，可先在口腔内含少许时间，让口腔适应一下寒冷，然
                                                                                      后慢慢进食，这样既有凉爽舒适之感，又可避免伤及脾胃。如果条
                                                                                      件许可，口渴时应喝些温开水，以免伤胃。
                                                                                          有的同学说，我不喝冷饮，冲个凉水澡可以吗？答案是否定的。
                                                                                      人体在活动状态下，体内产生的热量较多，这些热量本应向外发散。
                                                                                      此时如果突然用凉水洗澡，皮肤毛孔就会闭塞，多余的热量不易散发
                                                                                      出去，反而会感到身体更热。所以，用温水冲澡，才是健康的选择。