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【娱乐】比谁的肺活量大。按0

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健康状况愈好的人肺活量愈大,肺组织损害如肺结核、肺纤维化、肺不张或肺叶切除达一定程度时都可能使肺活量减小;脊柱后凸,胸膜增厚,渗出性胸膜炎或气胸等,也可使肺扩张受限,肺活量减小。因此,肺活量明显减小是限制性通气障碍的表现。由于肺活量的测定方法简单,重复性较好,故是健康检查常用的指标。测定肺活量因不限呼气的速度,而测不出呼吸道通气不畅的疾病,因此采用时间肺活量测定法,作为肺功能的动态指标较为理想。时间肺活量就是最大吸气后用力作最快速度呼气,直至呼完为止。同时分别记录第1、2、3秒末呼出的气量。正常人应分别呼出其肺活量的83%、96%和99%。患肺阻塞性肺部疾病者往往需要5~6秒或更多时间才能呼出全部肺活量;呼吸运动受限的许多病理状态下,第1秒时间肺活量增加,并可提前呼完全部肺活量。所以,时间肺活量可作为鉴别阻塞性或限制性通气障碍的参考。
医学界已将肺活量作为检测人体衰老的首选项目。肺活量是一个人做最大吸气后再做最大呼气即呼出气流的量。成年男子的肺活量约3500~4000毫升;成年女子约2500~3000毫升。肺活量主要取决于胸腔壁的扩张与收缩的宽舒程度。


1楼2013-01-13 10:29回复
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    2楼2013-01-13 10:30
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      来自Android客户端3楼2013-01-13 10:32
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                        IP属地:河北来自Android客户端13楼2020-04-28 14:27
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