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Griepentrog, J.E.; Labiner, H.E.; Gunn, S.R.; Rosengart, M.R. |
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Title  |
Bright environmental light improves the sleepiness of nightshift ICU nurses |
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Journal Article |
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Year |
2018 |
Publication |
Critical Care (London, England) |
Abbreviated Journal |
Crit Care |
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Volume |
22 |
Issue |
1 |
Pages |
295 |
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Keywords |
Circadian; Light; Night shift; Nurse; Shift work sleep disorder |
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Abstract |
BACKGROUND: Shift work can disturb circadian homeostasis and result in fatigue, excessive sleepiness, and reduced quality of life. Light therapy has been shown to impart positive effects in night shift workers. We sought to determine whether or not prolonged exposure to bright light during a night shift reduces sleepiness and enhances psychomotor performance among ICU nurses.
METHODS: This is a single-center randomized, crossover clinical trial at a surgical trauma ICU. ICU nurses working a night shift were exposed to a 10-h period of high illuminance (1500-2000 lx) white light compared to standard ambient fluorescent lighting of the hospital. They then completed the Stanford Sleepiness Scale and the Psychomotor Vigilance Test. The primary and secondary endpoints were analyzed using the paired t test. A p value <0.05 was considered significant.
RESULTS: A total of 43 matched pairs completed both lighting exposures and were analyzed. When exposed to high illuminance lighting subjects experienced reduced sleepiness scores on the Stanford Sleepiness Scale than when exposed to standard hospital lighting: mean (sem) 2.6 (0.2) vs. 3.0 (0.2), p = 0.03. However, they committed more psychomotor errors: 2.3 (0.2) vs. 1.7 (0.2), p = 0.03.
CONCLUSIONS: A bright lighting environment for ICU nurses working the night shift reduces sleepiness but increases the number of psychomotor errors.
TRIAL REGISTRATION: ClinicalTrials.gov, NCT03331822 . Retrospectively registered on 6 November 2017. |
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Department of Critical Care Medicine, University of Pittsburgh, Pittsburgh, PA, USA. rosengartmr@upmc.edu |
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1364-8535 |
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PMID:30424793 |
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GFZ @ kyba @ |
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2070 |
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Kumar, J.; Malik, S.; Bhardwaj, S.K.; Rani, S. |
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Title |
Bright light at night alters the perception of daylength in Indian weaver bird (Ploceus philippinus) |
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Journal Article |
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Year |
2018 |
Publication |
Journal of Experimental Zoology. Part A, Ecological and Integrative Physiology |
Abbreviated Journal |
J Exp Zool A Ecol Integr Physiol |
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Volume |
329 |
Issue |
8-9 |
Pages |
488-496 |
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Keywords |
Animals |
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Abstract |
The brighter nights have posed new challenges to the wild species by affecting their temporal physiology. The present study on Indian weaver bird (Ploceus philippinus) investigated if exposure to bright light at different phases of night affects their clock-mediated daily functions. Birds were placed individually in specially designed activity cages under short days and long nights (8L:16D; L = 100 lux, D < 0.1 lux) for approximately 3 weeks (19 days). Thereafter, they were divided into four groups (n = 6-9), and given approximately 2 lux light either for the entire night (ZT 08-24; zeitgeber time 0 = time of light on; pattern A) or for 4 hr (pattern B), placed in 16 hr night such that its onset coincides with the onset of night (early night group, ZT 08-12), its end with the end of night (late night group, ZT 20-24), or the night was interrupted in the middle (midnight group, ZT 14-18). The results showed that bright light in entire night induced early onset of day activity and fragmented rest at night, however, if given at different phases of night, it made the days longer by delaying end (early night group) or advancing onset of daily activity (late night group). It also suppressed the melatonin levels and increased body temperature. These results suggest that bright light at night alters the perception of daylength and affects the underlying physiology. The findings may be useful in adopting a strategy for use of night light without disturbing species fitness in their environment. |
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Department of Zoology, University of Lucknow, Lucknow, India |
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2471-5638 |
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PMID:30043408 |
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GFZ @ kyba @ |
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1971 |
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Horton, K.G.; Nilsson, C.; Van Doren, B.M.; La Sorte, F.A.; Dokter, A.M.; Farnsworth, A. |
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Title |
Bright lights in the big cities: migratory birds’ exposure to artificial light |
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Journal Article |
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2019 |
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Frontiers in Ecology and the Environment |
Abbreviated Journal |
Front Ecol Environ |
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17 |
Issue |
4 |
Pages |
209-214 |
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Keywords |
Animals; Birds; migratory birds |
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Many species of migratory birds have evolved the ability to migrate at night, and the recent and rapid expansion of artificial light at night has markedly altered the nighttime sky through which they travel. Migrating birds regularly pass through heavily illuminated landscapes, and bright lights affect avian orientation. But risks to migrating birds from artificial light are not spatially or temporally uniform, representing a challenge for mitigating potential hazards and developing action plans to catalog risks at continental scales. We leveraged over two decades of remote‐sensing data collected by weather surveillance radar and satellite‐based sensors to identify locations and times of year when the highest numbers of migrating birds are exposed to light pollution in the contiguous US. Our continental‐scale quantification of light exposure provides a novel opportunity for dynamic and targeted conservation strategies to address the hazards posed by light pollution to nocturnally migrating birds. |
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1540-9295 |
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GFZ @ kyba @ |
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2285 |
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Thancharoen, A.; Branham, M.A.; Lloyd, J.E. |
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Title |
Building Twilight “Light Sensors”: To Study the Effects of Light Pollution on Fireflies |
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Journal Article |
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2008 |
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The American Biology Teacher |
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The American Biology Teacher |
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70 |
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2 |
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e6-e12 |
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Keywords |
Animals; Education |
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0002-7685 |
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GFZ @ kyba @ |
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2182 |
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Author |
Croft, T.A. |
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Title |
Burning Waste Gas in Oil Fields |
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Journal Article |
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Year |
1973 |
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Nature |
Abbreviated Journal |
Nature |
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Volume |
245 |
Issue |
5425 |
Pages |
375-376 |
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Keywords |
Remote Sensing |
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I WAS recently amazed by some night-time spacecraft photographs, exemplified by Fig. 1, that present graphic evidence of waste and pollution. These were obtained by the United States Air Force DAPP system which has sensors in the visible 0.4 to 1.1 µm band and an infrared imaging system in the 8 to 13 µm band (ref. 1 and J. L. McLucas, personal communication). The visible band sensor is Capable of responding to very dim light with a controllable threshold (T. O. Haig, personal communication) and it provided these pictures. The lights of cities are clearly visible, as are the aurora, surface features illuminated by moonlight, and fires such as those caused by burning gas from oil fields and refineries. Much power is evidently being generated to light the cities of the world since at the inhabited areas are clearly outlined. It is also apparent that, in the process of extracting liquid petroleum from beneath the surface of the Earth, abundant gas supply has been discovered but is not used. Being unable to contain the gas or to transport it to a user, it is simply burnt. |
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0028-0836 |
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GFZ @ kyba @ |
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2365 |
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