Sleep and circadian rhythms in four orbiting astronauts
| Autor: | Timothy H. Monk, Daniel J. Buysse, Kathy S. Kennedy, Linda M. Willrich, Bart D. Billy |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
0301 basic medicine
Test battery Adult Male medicine.medical_specialty Meteorology Hydrocortisone Light Physiology Movement Space Shuttle Sleep REM Audiology Body Temperature 03 medical and health sciences 0302 clinical medicine Physiology (medical) Surveys and Questionnaires Work Schedule Tolerance medicine Humans Circadian rhythm Melatonin business.industry Weightlessness Middle Aged Space Flight Circadian Rhythm Alertness Affect 030104 developmental biology Astronauts Sleep diary Sleep (system call) Sleep Stages business Sleep 030217 neurology & neurosurgery Biomarkers |
| Zdroj: | Journal of biological rhythms. 13(3) |
| ISSN: | 0748-7304 |
| Popis: | This experiment measured the sleep and circadian rhythms of four male astronauts aboard a space shuttle (STS-78) orbiting the Earth for 17 days. The space mission was specially scheduled to minimize disruptions in circadian rhythms and sleep so that the effects of space flight and microgravity per se could be studied. Data were collected in 72-h measurement blocks: one block 7 days before launch, one early within the mission (3 days after launch), one late in the mission (12 days after launch), and one 18 days after landing. Within each measurement block, all sleep was recorded both polysomnographically and by sleep diary. Core body temperature was sampled every 6 mins. Actillumes© were worn continuously. All urine samples were collected separately. Performance was assessed by a computerized test battery (3/day) and by end-of-shift questionnaires (1/day); mood and alertness were measured by visual analogue scales (5/day). Circadian rhythms in orbit appeared to be very similar in phase and amplitude to those on the ground, and were appropriately aligned for the required work/rest schedule. There was no change from early flight to late flight. This was also reflected in mood, alertness, and performance scores, which were satisfactory at both in-flight time points. However, in-flight sleep showed a decreased amount of sleep obtained (mean = 6.1 h), and all four astronauts showed a decrease in delta sleep. No further degradation in sleep was seen when early flight was compared to late flight, and no other sleep parameters showed reliable trends. |
| Databáze: | OpenAIRE |
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