(j) Psychological effects. Working in space has its associated psychological health oroblems that should not be ignored. They may be caused by factors such as personnel isolation as a group, limited recreational activities, and the constant awareness of hazards connected with the unique working environment. (k) Contamination. The working environment in a space vehicle is a closed one, and hence the problem of contamination is much more severe than on Earth. (1) Pressure excursions. Sudden changes of pressure may be experienced when transferring from one space vehicle to another if either cabin is not suitably pressurized. (m) Motion sickness. There may be sickness associated with weightlessness and bodily imbalance.
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