Journal of PHYSIOLOGICAL ANTHROPOLOGY
Online ISSN : 1880-6805
Print ISSN : 1880-6791
ORIGINALS
Influences of Diurnal Bright or Dim Light Exposure on Urine Volume in Humans
Ki-Ja HyunShinya NishimuraHiromi Tokura
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2006 Volume 25 Issue 2 Pages 189-192

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Abstract

We investigated with eight healthy females if 8 hr diurnal (0700 to 1500 h) bright rather than dim light (5,000 vs. 80 lx) influenced urine volume. Environmental illuminance was made identical at all other times besides 07:00 to 15:00 h. The participants spent time at strictly regulated schedules in a bioclimatic chamber (26°C, relative humidity 60%) for 57 h. Blood was drawn (2 ml) just before lunch in order to calculate Creatinine clearance (Ccr). Urine volume was significantly higher during wakefulness and the 8-h sleep period with bright rather than dim light. Ccr was significantly higher after bright light. The results were discussed in terms of suppression of the sympathetic nerve system under the influence of diurnal bright light exposure. We also discussed these in terms of physiological polymorphisms.

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© 2006 Japan Society of Physiological Anthropology
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