Space motion sickness.

Space Motion Sickness (SMS) is the malady which frequently occurs shortly after attainment of sustained exposure to hypogravity. It is characterised by a variety of symptoms, which may proceed to nausea and eventually vomiting. Natural adaptation usually occurs if exposure to hypogravity is maintained. The condition appears to be the manifestation of motion sickness that is specific to hypogravity. It is associated with otolith-canal and otolith-eye conflict. SMS may have operational significance in impairing the performance of spacecraft crews. The condition is likely to be amenable to treatment with anti-motion sickness drugs. It may be possible to reduce any operational effects of SMS by suitable crew selection and training procedures.