Influences of Diurnal Bright or Dim Light Exposure on Urine Volume in Humans

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...

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Bibliographic Details
Published in:Journal of PHYSIOLOGICAL ANTHROPOLOGY 2006, Vol.25(2), pp.189-192
Main Authors: Hyun, Ki-Ja, Nishimura, Shinya, Tokura, Hiromi
Format: Article
Language:English
Subjects:
Adult
bright light
Circadian Rhythm - physiology
Creatinine - urine
creatinine clearance
dim light
Female
Humans
Light
physiological polymorphisms
renal circulation
Renal Circulation - physiology
Urine - physiology
urine volume
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Summary: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.
ISSN:1880-6791
1880-6805
DOI:10.2114/jpa2.25.189