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舒教练说,从图片中看出,女子身形还算胖,相对来说,胖子比瘦子更容易在水上漂。
“体型较胖的人,身体脂肪也多,在水里容易浮。从我的经验看,这个女的应该懂一点理论知识,至少她懂得尽量在水里不能挣扎,否则长江浪多,很容易呛水从而发生危险。”
舒教练说,“水上漂”就是“漂洋”或者说“静漂”,也就是“仰泳”时不需要任何动作。但是人这样长时间漂在水里,为了保持身体平衡,避免抽筋,手和脚还是要尽量动一动。
“简单地说,就是手脚都要往后划,但幅度尽量小一点,特别是呼吸,吐气要慢些,吸气要快些。”他说,对于不会游泳的人来说,入水后还得全身放松。
“静漂”动作
水质量约占人体总质量的2/3,因此人体的密度与纯净水的密度十分接近,在1.0克/立方厘米到1.1克/立方厘米之间。在吸气以及憋气的时候,上半身体积增大,密度小于水,可以平躺在水面上。但不会游泳的人进入水中,如果紧张,肌肉收缩,人就可能往下沉。
不同的人,人体密度也不同。胖子通常比瘦子密度小,骨骼细弱的人通常比骨骼粗壮的人密度小,孩子的密度通常比成年人小,女人的密度通常比男人小。
责任编辑:曲格林 CN064
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