Effects of high + Gz exposure on saliva α-amylase of fighter pilots
10.3760/cma.j.issn.1007-6239.2014.02.002
- VernacularTitle:高+Gz暴露对飞行员唾液α淀粉酶浓度的影响
- Author:
Hong XUE
1
;
Xia XUE
;
Weidong LI
;
Chengxuan XU
;
Yiran LIU
;
Xufang WANG
Author Information
1. 空军航空医学研究所载人离心机医学训练基地检验科,北京,100089
- Publication Type:Journal Article
- Keywords:
Acceleration;
Stress;
Saliva;
Alpha-amylase
- From:
Chinese Journal of Aerospace Medicine
2014;25(2):87-90
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the influence of +Gz acceleration on saliva a-amylase (SAA) of pilots,so as to assess the feasibility of taking SAA as an indicator of +Gz stress on pilots.Methods Saliva was collected from 47 pilots before and after + 6.5 Gz,+ 7.0 Gz and + 8.0 Gz centrifuge exposures.The SAA was measured by a-amylase kit (dynamic monitoring method) and chemiluminescnet immunoassay.Results ①The SAA and cortisol levels significantly changed by different +Gz exposures (F＝ 17.712,3.427,P＜0.01 or P＜0.05).Compared with that before exposures,the SAA levels measured after +6.5 Gz,+ 7.0 Gz and +8.0 Gz exposures were significantly higher (P＜0.01).The cortisol levels after +7.0 Gz and +8.0 Gz exposures were significantly higher than the baseline (P＜0.05 or 0.01).The cortisol level obtained after +8.0 Gz exposure was significantly higher than that before + 6.5 Gz,+ 7.0 Gz and + 8.0 Gz centrifuge exposures (P＜0.05).②Multivariate analysis showed that the aircraft type,pilot's age and flying hours had no influence on SAA and cortisol levels obtained after +Gz exposures.③ Pilots' cortisol levels were negatively correlated to the age and aircraft type of (r＝-0.328,-0.694,P＜0.05) but positively correlated to flying hours and +Gz level (r＝0.466,0.141,P＜0.05).SAA was positively correlated to +Gz level (r＝0.354,P＜0.01).④The levels of cortisol and SAA had less correlation either before or after +Gz exposure.Conclusions SAA elevates sensitivity with +Gz stress increase and quickly returns to baseline.So we can conclude that SAA could be a valid indicator of +Gz stress.
