| Autor: |
Sunde E; Department of Psychosocial Science, Faculty of Psychology, University of Bergen, 5020 Bergen, Norway., Pedersen T; Department of Biological and Medical Psychology, Faculty of Psychology, University of Bergen, 5020 Bergen, Norway., Mrdalj J; Department of Biological and Medical Psychology, Faculty of Psychology, University of Bergen, 5020 Bergen, Norway., Thun E; Department of Clinical Psychology, Faculty of Psychology, University of Bergen, 5020 Bergen, Norway., Grønli J; Department of Biological and Medical Psychology, Faculty of Psychology, University of Bergen, 5020 Bergen, Norway., Harris A; Department of Psychosocial Science, Faculty of Psychology, University of Bergen, 5020 Bergen, Norway., Bjorvatn B; Department of Global Public Health and Primary Care, Faculty of Medicine, University of Bergen, 5020 Bergen, Norway.; Norwegian Competence Center for Sleep Disorders, Haukeland University Hospital, 5021 Bergen, Norway., Waage S; Department of Global Public Health and Primary Care, Faculty of Medicine, University of Bergen, 5020 Bergen, Norway.; Norwegian Competence Center for Sleep Disorders, Haukeland University Hospital, 5021 Bergen, Norway., Skene DJ; Chronobiology, Faculty of Health and Medical Sciences, University of Surrey, Guildford GU2 7XH, UK., Pallesen S; Department of Psychosocial Science, Faculty of Psychology, University of Bergen, 5020 Bergen, Norway.; Norwegian Competence Center for Sleep Disorders, Haukeland University Hospital, 5021 Bergen, Norway.; Optentia Research Focus Area, North-West University, Vanderbijlpark 1900, South Africa. |
| Abstrakt: |
Light can be used to facilitate alertness, task performance and circadian adaptation during night work. Novel strategies for illumination of workplaces, using ceiling mounted LED-luminaires, allow the use of a range of different light conditions, altering intensity and spectral composition. This study (ClinicalTrials.gov Identifier NCT03203538) investigated the effects of short-wavelength narrow-bandwidth light (λ max = 455 nm) compared to long-wavelength narrow-bandwidth light (λ max = 625 nm), with similar photon density (~2.8 × 10 14 photons/cm 2 /s) across light conditions, during a simulated night shift (23:00-06:45 h) when conducting cognitive performance tasks. Light conditions were administered by ceiling mounted LED-luminaires. Using a within-subjects repeated measurements study design, a total of 34 healthy young adults (27 females and 7 males; mean age = 21.6 years, SD = 2.0 years) participated. The results revealed significantly reduced sleepiness and improved task performance during the night shift with short-wavelength light compared to long-wavelength light. There was also a larger shift of the melatonin rhythm (phase delay) after working a night shift in short-wavelength light compared to long-wavelength light. Participants' visual comfort was rated as better in the short-wavelength light than the long-wavelength light. Ceiling mounted LED-luminaires may be feasible to use in real workplaces, as these have the potential to provide light conditions that are favorable for alertness and performance among night workers. |
