[Genesis of vestibulo-autonomic disorders in space flight]

Some considerations on the mechanisms of vestibulo-vegetative disturbance in space flight are given on the basis of clinical observations, experience of otoneurological clinic, simulation experiments and examinations of cosmonauts. The starting point in these disturbances was a significant fact of blood redistribution in weightlessness and subsequent changes in hemodynamics, metabolism, etc. The body reactions to weightlessness seem to prepare pronounced vestibulo-vegetative reflexes to threshold and subthreshold vestibular stimuli induced by head and body movements in flight. Some aspects of the vestibular selection and training of cosmonauts are discussed from this point of view.