Journal
CLOCKS & SLEEP
Volume 2, Issue 4, Pages 502-522Publisher
MDPI
DOI: 10.3390/clockssleep2040037
Keywords
short-wavelength light; night work; sleepiness; alertness; performance; circadian rhythm
Categories
Funding
- Faculty of Psychology, University of Bergen, Norway
Ask authors/readers for more resources
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 (lambda(max) = 455 nm) compared to long-wavelength narrow-bandwidth light (lambda(max) = 625 nm), with similar photon density (similar to 2.8 x 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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available