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Diurnal Spectral Sensitivity of the Acute Alerting Effects of Light

Rahman, S.A. and Flynn-Evans, E.E. and Aeschbach, D. and Brainard, G.C. and Czeisler, C.A. and Lockley, S.W. (2014) Diurnal Spectral Sensitivity of the Acute Alerting Effects of Light. Sleep, 37 (2), pp. 271-281. The American Academy of Sleep Medicine. DOI: 10.5665/sleep.3396 ISSN 0161-8105

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Abstract

Study Objectives: Previous studies have demonstrated short-wavelength sensitivity for the acute alerting response to nocturnal light exposure. We assessed daytime spectral sensitivity in alertness, performance, and waking electroencephalogram (EEG). Design: Between-subjects (n = 8 per group). Setting: Inpatient intensive physiologic monitoring unit. Participants: Sixteen healthy young adults (mean age ± standard deviation = 23.8 ± 2.7 y). Interventions: Equal photon density exposure (2.8 × 1013 photons/cm2/s) to monochromatic 460 nm (blue) or 555 nm (green) light for 6.5 h centered in the middle of the 16-h episode of wakefulness during the biological day. Results were compared retrospectively to 16 individuals who were administered the same light exposure during the night. Measurements and Results: Daytime and nighttime 460-nm light exposure significantly improved auditory reaction time (P < 0.01 and P < 0.05, respectively) and reduced attentional lapses (P < 0.05), and improved EEG correlates of alertness compared to 555-nm exposure. Whereas subjective sleepiness ratings did not differ between the two spectral conditions during the daytime (P > 0.05), 460-nm light exposure at night significantly reduced subjective sleepiness compared to 555-nm light exposure at night (P < 0.05). Moreover, nighttime 460-nm exposure improved alertness to near-daytime levels. Conclusions: The alerting effects of short-wavelength 460-nm light are mediated by counteracting both the circadian drive for sleepiness and homeostatic sleep pressure at night, but only via reducing the effects of homeostatic sleep pressure during the day.

Item URL in elib:https://elib.dlr.de/89173/
Document Type:Article
Title:Diurnal Spectral Sensitivity of the Acute Alerting Effects of Light
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Rahman, S.A.UNSPECIFIEDUNSPECIFIED
Flynn-Evans, E.E.UNSPECIFIEDUNSPECIFIED
Aeschbach, D.daniel.aeschbach (at) dlr.deUNSPECIFIED
Brainard, G.C.UNSPECIFIEDUNSPECIFIED
Czeisler, C.A.UNSPECIFIEDUNSPECIFIED
Lockley, S.W.UNSPECIFIEDUNSPECIFIED
Date:2014
Journal or Publication Title:Sleep
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:37
DOI :10.5665/sleep.3396
Page Range:pp. 271-281
Publisher:The American Academy of Sleep Medicine
ISSN:0161-8105
Status:Published
Keywords:Alertness, circaidian, homeostatic, light, short-wavelength light, sleep
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:ATM and Operation (old)
DLR - Research area:Aeronautics
DLR - Program:L AO - Air Traffic Management and Operation
DLR - Research theme (Project):L - Human Factors and Safety in Aeronautics (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Aerospace Medicine > Flight Physiology
Deposited By: Sender, Alina
Deposited On:21 May 2014 11:43
Last Modified:21 Sep 2019 05:06

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