부산대학교 도서관

The results of the analysis of materials on the expert assessment of 66 healthy pilots subjected to a passive orthostatic stress test (POT) by the generally accepted technique of a 20-min head-down tilt bed rest at an angle of 80° to the horizontal are presented. The obtained hemodynamic responses to the test were typified using the generally accepted concepts of functional classes (FC). A good POT tolerance was recorded in 86.4% of the observations, with 36.4% assigned to the first functional class (FC-I) and 50%, to the second functional class (FC-II). A satisfactory orthostatic test tolerance (FC-III) was recorded in 10.6% of the observations, whereas a reduced and poor tolerance (FC-IV and FC-V) was found in 3% of the observations. According to ECGs and computer-assisted tachooscillography, subjects of the FC-I group reached the optimum indicators in their adaptive hemodynamic responses, compared to the pilots of the FC-II group and, particularly, the FC-III group. The latter two groups were found to exhibit some previously unknown objective symptoms, such as marked blood pressure (BP) lability and reversible hypo- and hypertensive responses, which allowed us to differentiate the FC-I pilots from the latter two groups. Based on the obtained results, additional clinical functional tolerance assessment criteria have been developed for a passive orthostatic test as part of the medical expert assessment of flight personnel with different levels of functional stability. [ABSTRACT FROM AUTHOR]