MOTION SICKNESS SUSCEPTIBILITY UNDER WEIGHTLESS AND HYPERGRAVITY CONDITIONS GENERATED BY PARABOLIC FLIGHT.
NAVAL AEROSPACE MEDICAL INST PENSACOLA FLA
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Motion sickness susceptibility of five labyrinthine-defective L-D and 25 normal subjects was tested under the force environments encountered in parabolic flight 0 g and hyper-g. The L-D subjects were uniformly symptomless, while the normal subjects revealed great inter- and intra-individual differences in susceptibility to motion sickness provoked by standardized head movements during 1 the hypergravic and 2 the weightless phases of the parabolic maneuver while restrained and 3 the weightless phase while being rotated in a chair. Four of six subjects tested under condition 1 were completely unaffected by the condition while two reacted with symptoms. Condition 2 provoked severe symptoms in five of the twelve subjects tested and moderate symptoms in one. Fifteen subjects tested under condition 3 revealed either a marked increase or decrease in susceptibility to Coriolis acceleration in weightlessness compared to terrestrial baseline measurements. Author
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