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Altered Susceptibility to Motion Sickness as a Function of Subgravity Level,
NAVAL AEROSPACE MEDICAL RESEARCH LAB PENSACOLA FL
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Large interindividual differences among 74 normal subjects in the change in susceptibility to motion sickness with effective lifting of the normal g-load by parabolic flight maneuvers were recorded with high test-retest reliability. Most subjects, who were required to make standardized head movements while seated in a chair rotating at a constant speed, demonstrated either a substantial increase or a decrease in susceptibility, in confirmation of a previous study, while a few appeared to be more or less unaffected by the 1 g to 0 g gravitational change. A similar test procedure conducted with eighteen of the subjects at lunar- and Martian-gravity levels revealed further interindividual differences in susceptibility revealed 1 a progressive change in susceptibility as a function of g-load in either the positive or negative direction that was characteristic of the individual, 2 a susceptibility level that appeared to be maintained at the fractional g-load, and 3 immunity to motion sickness at all g-levels tested below the Earth standard. The case history as well as groundbased functional and provocative tests of normal subjects proved to be inadequate in predicting susceptibilty to motion sickness under subgravity conditions. Author
APPROVED FOR PUBLIC RELEASE