United States Department of Transportation
i
Physiological, biochemical, and multiple-task-performance responses to different alterations of the wake-sleep cycle.
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1976-11-01
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[PDF-1.04 MB]
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Edition:OAM report.
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Abstract:Three groups, each comprising five healthy, male, paid volunteers (ages 21 to 30), were studied for 11 days. Baseline data were collected for 3 days, during which subjects adhered to a day/night routine. On the fourth day each group took a 'flight' in the altitude chamber.
Following the flight day, subjects in the first group (Group I) slept from only 0230 to 06000; subjects in the next group (Group II) had their day extended by 6 hours and began a new routine of sleeping from 0430 to 1200 for the remainder of the study; subjects in the third group (Group III) had their day compressed by 6 hours and slept from 2030 to 2400 only that fourth night and then began a new routine of sleeping from 1630 to 2400 for the final 7 days of the study.
According to the physiological and biochemical measurements, there was little difference between the two 6-hour-change groups (Groups II and III), both of which required longer rephasal times than did the group that experienced sleep loss but no time change (Group I) The psychomoter performance test indicated the greatest change in the group whose day was shortened by 6 hours (Group III). The Multiple Task Performance Battery (MTPB) indicated the greatest deficit in performance for Group III and the best postshift performance for Group II.
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