Objective:To provide references for aeromedical support by investigating the effect of training at high altitude on acute hypoxia tolerance of pilots.Methods:Eighteen high performance fighter pilots who had returned to plain for 1 week as they finished 3-month residence in plateau were chosen as training group and 36 pilots who flied same aircraft type but without plateau stay and training were assigned as control group. Both groups received anti-G and anti-hypoxia training. The acceptance line of hypoxia experience training was defined to 2 min and the arterial oxygen saturation (SaO 2) and the heart rate of pilots were tested every 20 s. The anti-G and anti-hypoxia ability detector of pilots and BeneView T6 ECG monitor were used for training, assessment and monitoring. Results:SaO 2 level in the training group was significantly higher than that in the control group at the corresponding time point from the 60 s of the training, and the differences was statistically significant ( t=2.63, 3.32, 4.79, 4.32, P=0.011, 0.002,<0.001,<0.001). The average of SaO 2 in the control group decreased rapidly with the extension of hypoxia time, while the average of SaO 2 in the training group decreased slowly with the extension of hypoxia time. The average of effective consciousness time of the training group [(441.11±67.03) s] was significantly longer than that of the control group [(195.00±31.49) s], and was 2.26 times of the control group, the difference was statistically significant ( t=17.74, P<0.001). Conclusions:After stationed and trained in plateau, the SaO 2 and the effective consciousness time of high performance fighter pilots under acute hypoxia have been significantly improved. Short term chronic hypoxia process can significantly improve the acute hypoxia tolerance of pilots, which is conducive to the effective response to high aerial hypoxia.

Objective:To provide references for aeromedical support by investigating the effect of training at high altitude on acute hypoxia tolerance of pilots.Methods:Eighteen high performance fighter pilots who had returned to plain for 1 week as they finished 3-month residence in plateau were chosen as training group and 36 pilots who flied same aircraft type but without plateau stay and training were assigned as control group. Both groups received anti-G and anti-hypoxia training. The acceptance line of hypoxia experience training was defined to 2 min and the arterial oxygen saturation (SaO 2) and the heart rate of pilots were tested every 20 s. The anti-G and anti-hypoxia ability detector of pilots and BeneView T6 ECG monitor were used for training, assessment and monitoring. Results:SaO 2 level in the training group was significantly higher than that in the control group at the corresponding time point from the 60 s of the training, and the differences was statistically significant ( t=2.63, 3.32, 4.79, 4.32, P=0.011, 0.002,<0.001,<0.001). The average of SaO 2 in the control group decreased rapidly with the extension of hypoxia time, while the average of SaO 2 in the training group decreased slowly with the extension of hypoxia time. The average of effective consciousness time of the training group [(441.11±67.03) s] was significantly longer than that of the control group [(195.00±31.49) s], and was 2.26 times of the control group, the difference was statistically significant ( t=17.74, P<0.001). Conclusions:After stationed and trained in plateau, the SaO 2 and the effective consciousness time of high performance fighter pilots under acute hypoxia have been significantly improved. Short term chronic hypoxia process can significantly improve the acute hypoxia tolerance of pilots, which is conducive to the effective response to high aerial hypoxia.