toggle visibility Search & Display Options

Select All    Deselect All
 |   | 
Details
   print
  Record Links
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 (down) 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.  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0918-8959 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number LoNNe @ christopher.kyba @ Serial 518  
Permanent link to this record
Select All    Deselect All
 |   | 
Details
   print

Save Citations:
Export Records: