Cited by 166Circadian rhythm and melatoninSleep and Work-Related FatigueErgonomics and Musculoskeletal Disorders

Effects of VDT tasks with a bright display at night on melatonin, core temperature, heart rate, and sleepiness

Higuchi, Shigekazu, Motohashi, Yutaka, Liu, Yang, Ahara, Mio, Kaneko, Yoshihiro·2003·Journal of Applied Physiology

Abstract

The effects of performing video display terminal (VDT) tasks with a bright display (BD) at night on nocturnal salivary melatonin concentration, rectal temperature, heart rate, and sleepiness were examined. Seven healthy male adults performed exciting VDT tasks with a BD and a dark display (DD) and boring VDT tasks with a BD and a DD from 2300 to 0200. The light intensities of the BD and DD were 45 and 15 lx at each subject's eye level, respectively. The exciting VDT task with both BD and DD significantly suppressed the nocturnal decrease in rectal temperature and heart rate and the nocturnal increase in sleepiness. The BD significantly suppressed the nocturnal decrease in rectal temperature during both exciting and boring VDT tasks. The nocturnal salivary melatonin concentration was significantly suppressed by the combination of the exciting task and BD. The results suggest that performing an exciting VDT task with a BD suppresses the nocturnal changes in melatonin concentration and other physiological indicators of human biological clocks.

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Crossref · 10.1152/japplphysiol.00616.2002

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31 of 31 references verified0 citation errors · 0 not checkable

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  • In the evening and early night, bright light, and in particular short wavelength (blue) light, induces phase-delays of the circadian rhythm and diminishes the decline in core body temperature and the increase in distal skin temperature.

    “In the evening and early night, bright light, and in particular short wavelength (blue) light, induces phase-delays of the circadian rhythm [56] and diminishes the decline in core body temperature and the increase in distal skin temperature [60].”

    From Human thermal perception and time of day: A review (2021) · cites this paper as [60]

  • The effect of light on circadian rhythms appears to occur even after small changes in ordinary light exposure.

    “Thus, the effect of light on circadian rhythms appears to occur even after small changes in ordinary light exposure which has considerable practical significance [56,60].”

    From Human thermal perception and time of day: A review (2021) · cites this paper as [60]

  • In the transition periods (morning and evening), the effect of light on circadian resetting appears to occur even after brief exposures and small changes in light exposure.

    “In particular, in the transition periods, i.e. morning and evening, the effect of light on circadian resetting appears to occur even after brief exposures and small changes in light exposure [56,57,60].”

    From Human thermal perception and time of day: A review (2021) · cites this paper as [60]

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Authors
Higuchi, S., Motohashi, Y., Liu, Y., Ahara, M., & Kaneko, Y.
Affiliations
Akita University (JP)
Venue
Journal of Applied Physiology
Published
2003-05-01
Volume
94
Issue
5
Pages
1773-1776
ISSN
  • 0161-7567 (ISSN-L)
  • 8750-7587
  • 1522-1601
OpenAlex
W2156571577
Cited by
165
References
32
Citations by year
2026: 3 · 2025: 11 · 2024: 4 · 2023: 9 · 2022: 5 · 2021: 9 · 2020: 12 · 2019: 8 · 2018: 6 · 2017: 11 · 2016: 7 · 2015: 14 · 2014: 11 · 2013: 6 · 2012: 9
FWCI
0.97
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Applied Physiology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
  • Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and Work-Related Fatigue
  • Social Sciences › Psychology › Social Psychology › Ergonomics and Musculoskeletal Disorders
Keywords
rectal temperature, heart rate, sleepiness, circadian rhythm, biological clock, night shift work
MeSH terms
Adult, Attention, Autonomic Nervous System, Body Temperature, Boredom, Central Nervous System, Circadian Rhythm, Electroencephalography, Heart Rate, Humans, Light, Male, Melatonin, Photic Stimulation, Saliva, Sleep Stages, Computer Terminals

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