Effect of Bright Light on EEG Activities and Subjective Sleepiness to Mental Task during Nocturnal Sleep Deprivation

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概要

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• The purpose of this study was to investigate the effect of the exposure to bright light on EEG activity and subjective sleepiness at rest and at the mental task during nocturnal sleep deprivation. Eight male subjects lay awake in semi-supine in a reclining seat from 21:00 to 04:30 under the bright (BL ; >2500lux) or the dim (DL ; < 150 lux) light conditions. During the sleep deprivation, the mental task (Stroop color-word conflict test : CWT) was performed each 15min in one hour. EEG, subjective sleepiness, rectal and mean skin temperatures and urinary melatonin concentrations were measured. The subjective sleepiness increased with time of sleep deprivation during both rest and CWT under the DL condition. The exposure to bright light delayed for 2 hours the increase in subjective sleepiness at rest and suppressed the increase in that during CWT. The bright light exposure also delayed the increase in the theta and alpha wave activities in EEG at rest. In contrast, the effect of the bright light exposure on the theta and alpha wave activities disappeared by CWT. Additionally, under the BL condition, the entire theta activity during CWT throughout nocturnal sleep deprivation increased significantly from that in a rest condition. Our results suggest that the exposure to bright light throughout nocturnal sleep deprivation influences the subjective sleepiness during the mental task and the EEG activity, as well as the subjective sleepiness at rest. However, the effect of the bright light exposure on the EEG activity at the mental task diminishes throughout nocturnal sleep deprivation.

• 日本生理人類学会の論文

著者

• Katsuura Tetsuo

  Graduate School of Engineering, Chiba University

• Yokoi Mari

  Division Of Design Science Graduate School Of Science And Technology Chiba University

• Katsuura Tetsuo

  Graduate School Of Engineering Chiba University

• Katsuura Tetsuo

  Ergonomics Laboratory Faculty Of Engineering Chiba University

• Aoki Ken

  Department of Hygiene and Space Medicine, Nihon University School of Medicine

• Iwanaga Koichi

  Division of Design Science, Graduate School of Science and Technology, Chiba University

• Shiomura Yoshihiro

  Ergonomics Section, Faculty of Engineering, Chiba University

• Aoki Ken

  Department Of Hygiene And Space Medicine Nihon University School Of Medicine

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