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Physiological changes, sleep, and morning mood in an isolated environmentBACKGROUND: Previous isolation studies have shown increased 24-h urine volumes and body weight gains in subjects. This project examined those and other physiological variables in relationship to sleep motor activity, subjective sleep quality, mood, and complaints during confinement. METHODS: Six male and two female subjects lived for 7 d in the National Space Development Agency of Japan's isolation chamber, which simulates the interior of the Japanese Experiment Module. Each 24-h period included 6 h of sleep, 3 meals, and 20 min of exercise. Each morning, subjects completed Sleep Sensation and Complaint Index questionnaires. Catecholamine and creatinine excretion, urine volume, and body weight were measured on the 2 d before and 2 d after confinement, and sleep motor activity was measured during confinement. RESULTS: Confinement produced no significant change in body weight, urine volume, or questionnaire results. In contrast, epinephrine, norepinephrine, and sleep motor activity exhibited significant differences during confinement (p < 0.05). Higher nocturnal norepinephrine excretion correlated with higher sleep motor activity. CONCLUSION: The 24-h epinephrine values were slightly higher than normal throughout the experiment, but lower than for subjects working under time-stress. High sympathetic activity (as indicated by norepinephrine) may have interfered with sleep.
Document ID
20040087995
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Kraft, Norbert O.
(NASA Ames Research Center Moffett Field CA United States)
Inoue, Natsuhiko
Mizuno, Koh
Ohshima, Hiroshi
Murai, Tadashi
Sekiguchi, Chiharu
Orasanu, J. M.
Date Acquired
August 21, 2013
Publication Date
November 1, 2002
Publication Information
Publication: Aviation, space, and environmental medicine
Volume: 73
Issue: 11
ISSN: 0095-6562
Subject Category
Behavioral Sciences
Distribution Limits
Public
Copyright
Other
Keywords
NASA Discipline Space Human Factors
NASA Center ARC
NASA Program Biomedical Research and Countermeasures

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