In the limited human experience of space exploration the women and men who ventured into the universe adapted very well to the microgravity and other habitation pressures of the space environment. Yet, in spite of astronauts' adaptation to increasingly complex demands of extended stay and varied tasks, human space activities continue to be a highly controlled and limited undertaking (Rich 1985). In order to achieve these ambitious goals space life science researchers still need to understand and control problems associated with human adaptation to space environment and particularly to changed force environments. Although significant advances have been made in understanding the mechanisms of vestibular adaptation to changeable gravity environments, the underlying mechanisms causing postflight postural ataxia are still not fully understood (Black & Paloski 1998, Paloski 1998).
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