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Träfflista för sökning "L773:0161 8105 OR L773:1550 9109 ;pers:(Akerstedt Torbjörn)"

Sökning: L773:0161 8105 OR L773:1550 9109 > Akerstedt Torbjörn

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1.
  • Akerstedt, Torbjörn, et al. (författare)
  • Sleep homeostasis during repeated sleep restriction and recovery : support from EEG dynamics.
  • 2009
  • Ingår i: Sleep. - : Oxford University Press (OUP). - 0161-8105 .- 1550-9109. ; 32:2, s. 217-22
  • Tidskriftsartikel (refereegranskat)abstract
    • STUDY OBJECTIVES: Sleep reduction normally causes a homeostatic response during subsequent recovery sleep, but this does not seem to be true for repeated partial sleep loss. The aim of the present study was to test the response to repeated partial sleep loss through detailed focus on spectral data and parts of sleep. DESIGN: The experiment involved 4 h of sleep across 5 days in the laboratory (partial sleep deprivation [PSD]), followed by 3 days of recovery sleep. PSD was achieved through a delayed bedtime. Nine individuals participated. To avoid "laboratory monotony," subjects were permitted to leave the lab for a few hours each day. MEASUREMENTS AND RESULTS: All sleep stages and the latencies to sleep and slow wave sleep (SWS) showed a significant reduction during PSD. However, SWS and TST (total sleep time) during the first half of sleep increased gradually across days with PSD. During the first recovery sleep, SWS was significantly increased, while stage 1 and latency to stage 3 were reduced. All were back to baseline on the second night of recovery sleep. Summed spectral power during the first 3.8 h of sleep showed a gradual and robust increase (50% above baseline) in the range 1.25-7.25 Hz across days with PSD up to first recovery sleep and then returned to baseline. CONCLUSIONS: SWS and summed power density in a broad low-frequency band respond to repeated partial sleep deprivation in a dose-response fashion during the first 4 h sleep, apparently reflecting a robust and stable homeostatic response to sleep loss.
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2.
  • Waage, Siri, et al. (författare)
  • Shift work disorder among oil rig workers in the North Sea.
  • 2009
  • Ingår i: Sleep. - : Oxford University Press (OUP). - 0161-8105 .- 1550-9109. ; 32:4, s. 558-65
  • Tidskriftsartikel (refereegranskat)abstract
    • STUDY OBJECTIVES: Shift work disorder (SWD) is a circadian rhythm sleep disorder caused by work hours during the usual sleep period. The main symptoms are excessive sleepiness and insomnia temporally associated with the working schedule. The aim of the present study was to examine SWD among shift workers in the North Sea. DESIGN AND PARTICIPANTS: A total of 103 shift workers (2 weeks on 7 nights/7days, 12-h shifts, 4 weeks off), mean age 39.8 years, working at an oil rig in the North Sea responded to a questionnaire about SWD. They also completed the Pittsburgh Sleep Quality Index, Bergen Insomnia Scale, Epworth Sleepiness Scale, Composite Morningness Questionnaire, Subjective Health Complaint Inventory, Demand/Control, and Instrumental Mastery Oriented Coping (based on the Utrecht Coping list). Most of these instruments were administered during the first day of the 2-week working period, thus reflecting symptoms and complaints during the 4-week non-work period. The shift workers were also compared to day workers at the oil rig. RESULTS: Twenty-four individuals were classified as suffering from SWD, yielding a prevalence for SWD of 23.3%. During the 4-week non-work period, individuals with SWD reported significantly poorer sleep quality, as measured by the Pittsburgh Sleep Quality Index, and more subjective health complaints than individuals not having SWD. There were no differences between the 2 groups in sleepiness, insomnia, circadian preference, psychological demands, or control. Individuals with SWD reported significantly lower scores on coping. The reports of shift workers without SWD were similar to those of day workers regarding sleep, sleepiness, subjective health complaints, and coping. CONCLUSIONS: The prevalence of SWD was relatively high among these shift workers. Individuals with SWD reported poorer sleep quality and more subjective health complaints in the non-work period than shift workers not having SWD.
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3.
  • Westerlund, Hugo, et al. (författare)
  • Work-related sleep disturbances and sickness absence in the Swedish working population, 1993-1999.
  • 2008
  • Ingår i: Sleep. - 0161-8105. ; 31:8, s. 1169-77
  • Tidskriftsartikel (refereegranskat)abstract
    • Work-related sleep disturbances and sickness absence in the Swedish working population, 1993-1999.Westerlund H, Alexanderson K, Akerstedt T, Hanson LM, Theorell T, Kivimäki M.Stress Research Institute, Stockholm University, Stockholm, Sweden. hugo.westerlund@stressforskning.su.seSTUDY OBJECTIVES: To examine secular trends in work-related sleep disturbances and their association with sickness absence in the Swedish working population. DESIGN: Nationally representative cross-sectional samples of the Swedish working population aged 16-64 (the biennial Swedish Work Environment Survey) in 1993, 1995, and 1999 respectively. Questionnaire data on work-related sleep disturbances were linked to records of medically-certified sick-leave spells exceeding 14 days obtained from national registers. SETTING: All Sweden. PARTICIPANTS: A total of 28,424 individuals aged 16-65 with complete data (5162/5173 women/men in 1993; 4635/4764 in 1995; and 4422/4268 in 1999). INTERVENTIONS: N/A. MEASUREMENTS AND RESULTS: The age-adjusted proportion of women with work-related sleep disturbances at least once a week increased from 12.3% in 1993 to 21.7% in 1999 (P < 0.001). The corresponding figures for men were 12.5% to 18.6% (P < 0.001). There was a strong cross-sectional association between work-related sleep disturbances and sickness absence in both genders and in each studied year. Using binary logistic regressions and adjusting for age, supervisory position, and geographical region, the odds ratios for sickness absence for those who reported work-related sleep disturbances every day, compared with those who answered "not at all/seldom last 3 months" varied between 3.22 (1.88-5.50) and 4.26 (2.56-7.19), with the strongest associations seen in 1999. Adjustment for health indicators, especially depressive symptoms, attenuated the relationship substantially. CONCLUSIONS: Self-reported sleep disturbances attributed to work-related causes were on the rise in Sweden and were associated with medically-certified sickness absence. Most of this association seems to be accounted for by depressive symptoms.
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