Deacclimatization observation for the pilots off the station in plateau

Objective To study the influences of plateau environment on pilots' physical and mental health and the major medical problems generated in deacclimatization.Methods Nineteen pilots were selected to answer the questionnaires on the subject of deacclimatization on the 4th day after their 3-month plateau stationing.Eleven pilots were detected by radiology in 2 phases:one-month plateau stationing and one week after plateau stationing.On the 2nd day after 3-month plateau stationing,6 pilots' biochemical indicators were tested.Results Nineteen pilots showed various degrees of symptoms in deacclimatization and 84.2 ％ of them complained that the symptoms in deacclimatization affected their life and normal work as they were off plateau.As compared with the values in 1-month stationing,11 pilots' upper and lower diameter of the left hepatic lobe reduced when they returned plain for a week 0＝3.211,P＜0.05).As compared with that in 1-month stationing,their algebraic sum of V5 lead R wave amplitude and V1 lead S wave amplitude significantly reduced after 1 week off the stationing (t＝ 2.422,P＜0.05).Compared with that in plateau station,the pilots' systolic acceleration time was significantly increased when they return to plain for 1 week (t＝3.854,P＜0.05).Six pilots' red blood cell,hemoglobin,uric acid,total bilirubin,triglyceride,cystatin C,complement C4 and interleukin-10 significantly increased (t ＝ 2.601-7.537,P＜0.05).Pilots' immunoglobulin A and transforming growth factor β were significantly lower than the normal values (t＝2.731,16.824,P＜0.05) when they stationed on Plateau for 3 months.Conclusions Imaging,electrocardiography and biochemical tests verified that plateau environment would influence the pilots' physical status.It is suggested to take protective measures for pilots before entering plateau and to carry out the effective medical rehabilitation after returning plain. Key words: Altitude;  Acclimatization;  Questionnaires;  Ultrasonography;  Elctrocardiography; Blood cell