屏气时间

大学生肺活量与屏气时间的关系

Relations Between the Vital Capacity and the Breath-Holding Time in College Students

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。

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 ) .

结论B组屏气时间比A组明显增加，两组屏气的时间男性大于女性，两组屏气时间增加率男性小于女性。

The time of breath holding is longer in male than female , and the rate of time increasing is reverse .

式中Y为肺活量（ml），X为屏气时间（s）。

Y represents the VC ( ml ) and X represents the BHT ( s ) .

方法选胸腹部CT检查的病人（志愿者），进行呼吸训练，用秒表测量A组与B组的屏气时间；

Methods The patients that were selected by volunteer with performed chest and abdomen CT were trained breath and measured the breath holding time in A and B group .

结果随着屏气时间的延长，Vm呈线性升高（P<0.001），而PI值则呈线性下降（P<0.05）。

Results With the extension of breath holding time , Vm increased in linear ( P < 0.001 ), while the PI decreased linearly ( P < 0.05 ) .

屏气扫描时间16～22秒。

Acquisition time took 16-22 sec with breath-hold .

结论本研究结果表明MRI屏气电影法成像时间短，无运动伪影，是一种临床评价左心功能有价值的方法。

Conclusion Breath hold cine MR imaging is useful method for evaluation the left ventricular function because of non ghosting artifacts and short imaging time .

杰克，你不可能屏气屏这么长时间。

Jack , you can 't hold your breath that long .

屏气测试深吸一口气，然后屏气，时间越久越好，再慢慢呼出，呼出时间3秒钟为最理想。

Breathless test is sucked greatly at a heat , next breathless , time Yue Jiuyue is good , again slowly expiration , expiration time is3 seconds the idealest .

目的通过平静呼吸吸气末屏气（组）A与过度换气呼气末屏气（组）B的比较，找出既能增加屏气时间，又能减少层面差异的方法。

Objective To find a method that allow increase breath holding time and decrease slice difference by compared with breath holding after excessive breath and after nomal breath .