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游泳前过度深呼吸 有可能造成溺水
2017-09-05 07:42:01 中国青年网
游泳时,憋气、换气是大家使用频率最高的两个动作,特别是为了潜泳时间更长,或者进行憋气比赛,深吸几口气在所难免。然而却有网友指出,这样的深呼吸不宜过度,否则容易产生溺水现象。
红灯:过度换气或过度深呼吸时,其实并没有吸入太多氧气,但二氧化碳排出很多,造成低二氧化碳的表现,医学上称为低碳酸血症。游泳时,虽然缺氧已达到影响脑意识的程度,但吸气中枢还没有被启动,人就会出现意识丧失,浅水晕厥。浅水晕厥是指在小于5米水深的浅水,潜水者大脑缺氧引起的意识丧失。它的特点是,悄无声息突然发生,由于溺水者前先发生了意识丧失,所以不会有任何挣扎迹象,溺水后仍然会漂浮在水中,因此难以及时发现。
绿灯:专家强调,无论水深浅,都不鼓励水下长时间屏气或低氧训练。下水前要注意呼吸节律,不要进行过度深呼吸,以免造成浅水晕厥的发生。
本报记者 方月宁
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