飞行员在高+Gz暴露后的肺功能变化

目的 研究不同水平高＋Gz暴露后对人体肺功能的后效应.方法 95名现役男性歼击机飞行员,分别接受＋7 Gz和＋9 Gz离心机检查,于＋Gz暴露前1 d和暴露后12～65 min内测定肺容量、肺通气功能和弥散功能指标.结果 ＋7 Gz暴露后,飞行员肺弥散功能减退和轻度小气道功能异常,＋9 Gz暴露后程度加重,并出现肺活量降低.但＋7 Gz和＋9 Gz之间,各项指标无明显差异.结论 高G暴露可导致小气道功能和弥散功能减低的后效应,其持续时间和对飞行员肺功能有无长期影响有待进一步研究.

Changes of lung function after high +Gz exposure in pilots

Objective To explore the after effects of high +Gz exposure on lung function in humans. Methods Ninety-five fighter pilots served as subjects. Twenty-nine of them underwent + 7Gz centrifuge testing with anti-G suit and L-1 maneuver,40 of them underwent +9 Gz centrifuge testing with PBG in addition and 26 of them both +7Gz and + 9 Gz testing. The lung volume, the index of ventilation and diffusion function were measured one day before centrifuge testing and 12-65 minutes after testing. Results As compared with the results obtained before centrifuge testing, FEV1.0, V50 ,V25 and DLCO were significantly lowered after +7 Gz testing, showing that the diffusion function was reduced and small airways had low-graded obstruction. After +9 Gz testing these changes aggravated with lowering of vital capacity in addition, while the differences between lung function indexes after +7 Gz and +9 Gz exposures were non-significant. Conclusion High +Gz exposure may lead after-effect on lung function. The duration of the after-effect and its long-term influence on pulmonary function of pilots need further investigation.