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Author Wada, K.; Nagata, C.; Nakamura, K.; Iwasa, S.; Shiraki, M.; Shimizu, H. url  doi
openurl 
  Title Light exposure at night, sleep duration and sex hormone levels in pregnant Japanese women Type Journal Article
  Year 2012 Publication Endocrine Journal Abbreviated Journal Endocr J  
  Volume 59 Issue 5 Pages 393-398  
  Keywords Human Health  
  Abstract The association between light exposure at night and sex hormone levels in utero has scarcely reported. We assessed the associations between sleep duration or being awake in the late evening hours, which can be as indicator of light exposure at night, and the maternal and umbilical blood hormone levels during pregnancy and at delivery among Japanese women. The data for 236 women and their newborns who visited a maternal clinic in Gifu, Japan, between May 2000 and October 2001 were analyzed. Maternal blood samples were obtained at approximately the 10th weeks, 29th weeks of gestation, and at delivery. Umbilical cord artery blood was immediately drawn after birth. Information for sleep during pregnancy was obtained by a self-administered questionnaire. The levels of estradiol and testosterone were measured using radioimmunoassay. Maternal serum testosterone level in the 10th week was higher among those who were awake at or after 1:00 a.m. than among those who were asleep at that time (P = 0.032). Maternal estradiol level in the 29th week was inversely associated with sleep duration on weekends (P = 0.043). Umbilical testosterone level at delivery inversely correlated with sleep duration on weekdays (P = 0.030). These associations were somewhat stronger among mothers with female offspring than those with male offspring. These results suggested that exposure to light at night might increase sex hormone levels during pregnancy.  
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  ISSN 0918-8959 ISBN Medium  
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  Notes Approved no  
  Call Number LoNNe @ christopher.kyba @ Serial 518  
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Author Goldman, B.D. url  doi
openurl 
  Title Mammalian Photoperiodic System: Formal Properties and Neuroendocrine Mechanisms of Photoperiodic Time Measurement Type Journal Article
  Year 2001 Publication Journal of Biological Rhythms Abbreviated Journal Journal of Biological Rhythms  
  Volume 16 Issue 4 Pages 283-301  
  Keywords Human Health  
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  Series Volume Series Issue Edition  
  ISSN 0748-7304 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number LoNNe @ kagoburian @ Serial 756  
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Author Daan, S.; Merrow, M. url  doi
openurl 
  Title External Time-Internal Time Type Journal Article
  Year 2002 Publication Journal of Biological Rhythms Abbreviated Journal Journal of Biological Rhythms  
  Volume 17 Issue 2 Pages 107-109  
  Keywords Human Health  
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  ISSN 0748-7304 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number LoNNe @ kagoburian @ Serial 734  
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Author Van Gelder, R.N.; Mawad, K. url  doi
openurl 
  Title Illuminating the Mysteries of Melanopsin and Circadian Photoreception Type Journal Article
  Year 2008 Publication Journal of Biological Rhythms Abbreviated Journal Journal of Biological Rhythms  
  Volume 23 Issue 5 Pages 394-395  
  Keywords Human Health  
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  ISSN 0748-7304 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number LoNNe @ kagoburian @ Serial 828  
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Author Brainard, G.C.; Rollag, M.D.; Hanifin, J.P. url  doi
openurl 
  Title Photic Regulation of Melatonin in Humans: Ocular and Neural Signal Transduction Type Journal Article
  Year 1997 Publication Journal of Biological Rhythms Abbreviated Journal Journal of Biological Rhythms  
  Volume 12 Issue 6 Pages 537-546  
  Keywords Human Health; eye; lens; light; melatonin suppression; photoreceptor; pineal gland; pupil  
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  ISSN 0748-7304 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number LoNNe @ schroer @ Serial 583  
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