Circadian "profile" of short and long sleepers.
Foret-J; Benoit-O; Merle-B
The twenty-four hour workday: proceedings of a symposium on variations in work-sleep schedules. Johnson LC, Texas DI, Colquhoun WP, Colligan MJ, eds. Cincinnati, OH: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control, National Institute for Occupational Safety and Health, DHHS (NIOSH) Publication No. 81-127, 1981 Jul; :625-639
The response of various biological rhythms to an abrupt change of the basic wake sleep alternation was studied. Ten long (LS) and ten short sleepers (SS) were selected from a population of 310 students. In each group there were two female and three male students. Standard measures of sleep and circadian rhythms were used. The experimental protocol in the first session included: two baseline nights, one sleep deprived night, one recovery night. The schedule in the second session was: one baseline night, one sleep deprived night, one morning recovery sleep, one recovery night. The average duration of paradoxical sleep (PS) was 18.8 +/- 10.7 minutes in LS and 17.3 +/- 11.7 minutes in SS. Characteristic for day sleep was the reduction of total sleep time in both LS and SS, and the trend toward a similarity of the groups in terms of sleep duration. The sleep deficit due to schedule inversion was larger in LS than in SS. The temperature rhythm of SS appeared to reach a plateau for a longer time than that of LS. The amplitude of the rhythm was significantly smaller in SS than in LS. If the beginning of the plateau was defined as peak, the temperature curve of SS leveled off earlier than that of LS. The acrophase for self estimated mood appeared significantly later in SS than in LS. On the whole, SS were less affected by sleep deprivation than LS. The degree of coupling between the rhythm of activity and temperature was likely to be greater in LS than in SS. LS tended to show larger temperature amplitudes than SS. There was no obvious relationship between thermic level and wake sleep transition in a normal night of sleep. The authors conclude that the sensitivity of an individual to a phase displacement appears to depend on various factors.
Sleep-deprivation; Circadian-rhythms; Men; Women; Physiological-testing; Neurophysiology; Shift-work; Biological-rhythms
Johnson-LC; Texas-DI; Colquhoun-WP; Colligan-MJ
DHHS (NIOSH) Publication No. 81-127
The twenty-four hour workday: proceedings of a symposium on variations in work-sleep schedules