For the 9 subjects, absolute data, as well as data normalized using the preflight average, showed a significant decrease in CVP from early in the mission (day 1) to late in the mission (day 6). After inspection of the data, subjects were grouped according to whether or not the last in-flight data point was greater than their preflight average. The 2 groups (n=4 and n=5) were compared with respect to the relationship between CVP response and the subjects' sex, age, severity of motion sickness, body weight, and changes in body weight. The results for these factors were equivocal because of the small number of cases. The decrease in CVP agrees with earlier studies, but this study showed a different time course for the changes.
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