[Possibility to predict cosmonauts' orthostatic tolerance following short-and long-term space flights].
According to the analysis of the data of active and passive orthostatic tolerance (OST) testing before and after 67 short- (SSF) and 53 long-term (LSF) space flights OST declined in all the cosmonauts regardless of flight length. Active testing on R+1 after SSF (7 to 25 d) and LSF (49 to 438 d) attested OST loss by 33% and 48%, respectively. Full OST recovery following SSF and LSF was observed in a week and 1.5-2 months, respectively. A correlation was established (r = 0.81) between the post-flight OST loss and pre-flight baseline value. Depending on whether the pre-flight OST value was very good, good or satisfactory, its loss on R+1 after LSF can make up 20-30%, 30-50% and 55-65%, respectively. Consequently, data of preflight OST testing can be used for prediction of its decline post normal space flight.
Fomina
G A
GA
Kotovskaia
A R
AR
Zhernavkov
A F
AF
Pochuev
V I
VI
D018480:Astronauts; D006439:Hemodynamics / Q000502:physiology; D006801:Humans; D007024:Hypotension, Orthostatic / Q000175:diagnosis*; D011237:Predictive Value of Tests; D013026:Space Flight; D013997:Time Factors