To compare the effect of helium-oxygen mixtures containing 80%helium or 60%helium on vital capacity(VC) and related index.

比较含80%氦和含60%氦的氦氧混合气体对肺活量及其相关指标的影响。

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An investigation is made on 1653 college students aged 18 to 24 in good health about their Vital Capacity (VC) and the Breath-Holding Time (BHT).

对年龄在18 ~ 24岁间的1653名健康大学生的肺活量和屏气时间进行了调查。

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AIM: To compare the effect of helium-oxygen mixtures containing 80% helium or 60% helium on vital capacity (VC) and related index.

目的：比较含80%氦和含60%氦的氦氧混合气体对肺活量及其相关指标的影响。

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