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J Appl Physiol (January 17, 2003). doi:10.1152/japplphysiol.00616.2002
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Submitted on July 9, 2002
Accepted on December 19, 2002

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

Shigekazu Higuchi1*, Yutaka Motohashi1, Yang Liu1, Mio Ahara1, and Yoshihiro Kaneko1

1 Department of Public Health, Akita University School of Medicine, Akita City, Akita, Japan

* To whom correspondence should be addressed. E-mail: higuchi{at}med.akita-u.ac.jp.

The effects of performing video display terminal (VDT) tasks with a bright display 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 bright display (BD) and a dark display (DD) and boring VDT tasks with a BD and a DD from 23:00 to 2:00. The light intensities of the BD and DD were 45 lx 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 bright display suppress the nocturnal changes in melatonin concentration and other physiological indicators of human biological clocks.




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