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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 Warthen, D.M.; Provencio, I. url  openurl
  Title The role of intrinsically photosensitive retinal ganglion cells in nonimage-forming responses to light Type Journal Article
  Year 2012 Publication Eye and Brain Abbreviated Journal  
  Volume 4 Issue Pages 43—48  
  Keywords Human Health; amygdala; bed nucleus of the stria terminalis; melanopsin; opsin; optic nerve; retina  
  Abstract Light exerts many effects on behavior and physiology. These effects can be characterized as either image-forming or nonimage-forming (NIF) visual processes. Image-forming vision refers to the process of detecting objects and organisms in the environment and distinguishing their physical characteristics, such as size, shape, and direction of motion. NIF vision, in contrast, refers to effects of light that are independent of fine spatiotemporal vision. NIF effects are many and varied, ranging from modulation of basal physiology, such as heart rate and body temperature, to changes in higher functions, such as mood and cognitive performance. In mammals, many NIF effects of light are dependent upon the inner retinal photopigment melanopsin and the cells in which melanopsin is expressed, the intrinsically photosensitive retinal ganglion cells (ipRGCs). The ipRGCs project broadly throughout the brain. Many of these projections terminate in areas known to mediate NIF effects, while others terminate in regions whose link to photoreception remains to be established. Additionally, the presence of ipRGC projections to areas of the brain with no known link to photoreception suggests the existence of additional ipRGC-mediated NIF effects. This review summarizes the known NIF effects of light and the role of melanopsin and ipRGCs in driving these effects, with an eye toward stimulating further investigation of the many and varied effects of light on physiology and behavior.  
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  Call Number LoNNe @ christopher.kyba @ Serial 519  
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Author Benke, K.E.; Benke, K.K.; Dimitriadis, C. url  openurl
  Title Spectral content of artificial lighting and effects on health. Type Journal Article
  Year 2011 Publication Journal of the Australasian College of Nutritional and Environmental Medicine Abbreviated Journal  
  Volume 30 Issue 3 Pages 13-15  
  Keywords Human Health  
  Abstract There is an increasing body of evidence indicating possible health effects from prolonged exposure to artificial lighting after dark. Both compact fluorescent lights and light emitting diode lamps have a greater proportion of blue light in the emission spectrum than the older incandescent light sources. Exposure to the blue light component at night has been the subject of ongoing research, with a number of published studies linking blue light content to the disruption of the internal body clock, suppression of melatonin production and various ocular effects. Aside from short-term discomfort, possible health effects include long-term chronic illnesses, including cancer, cardiovascular disease and diabetes. A brief review of recent research is provided, salient health issues are noted and discussed, and some examples of exposure minimisation strategies are suggested.  
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  Notes Approved no  
  Call Number LoNNe @ christopher.kyba @ Serial 520  
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Author Higuchi, S.; Fukuda, T.; Kozaki, T.; Takahashi, M.; Miura, N. url  doi
openurl 
  Title Effectiveness of a Red-visor Cap for Preventing Light-induced Melatonin Suppression during Simulated Night Work Type Journal Article
  Year 2011 Publication Journal of PHYSIOLOGICAL ANTHROPOLOGY Abbreviated Journal J Physiol Anthropol  
  Volume 30 Issue 6 Pages 251-258  
  Keywords Human Health  
  Abstract Bright light at night improves the alertness of night workers. Melatonin suppression induced by light at night is, however, reported to be a possible risk factor for breast cancer. Short-wavelength light has a strong impact on melatonin suppression. A red-visor cap can cut the short-wavelength light from the upper visual field selectively with no adverse effects on visibility. The purpose of this study was to investigate the effects of a red-visor cap on light-induced melatonin suppression, performance, and sleepiness at night. Eleven healthy young male adults (mean age: 21.2±0.9 yr) volunteered to participate in this study. On the first day, the subjects spent time in dim light (<15 lx) from 20:00 to 03:00 to measure baseline data of nocturnal salivary melatonin concentration. On the second day, the subjects were exposed to light for four hours from 23:00 to 03:00 with a nonvisor cap (500 lx), red-visor cap (approx. 160 lx) and blue-visor cap (approx. 160 lx). Subjective sleepiness and performance of a psychomotor vigilance task (PVT) were also measured on the second day. Compared to salivary melatonin concentration under dim light, the decrease in melatonin concentration was significant in a nonvisor cap condition but was not significant in a red-visor cap condition. The percentages of melatonin suppression in the nonvisor cap and red-visor cap conditions at 4 hours after exposure to light were 52.6±22.4% and 7.7±3.3%, respectively. The red-visor cap had no adverse effect on performance of the PVT, brightness and visual comfort, though it tended to increase subjective sleepiness. These results suggest that a red-visor cap is effective in preventing melatonin suppression with no adverse effects on vigilance performance, brightness and visibility.  
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  ISSN 1880-6791 ISBN Medium  
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  Notes Approved no  
  Call Number LoNNe @ christopher.kyba @ Serial 521  
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Author Reiter, R.J.; Rosales-Corral, S.; Coto-Montes, A.; Antonio Boga, J.; Tan, D.X.; Davis, J.M.; Konturek, P.C.; Konturek, S.J.; Brzozowski, T. url  openurl
  Title The photoperiod, circadian regulation and chronodisruption: the requisite interplay between the suprachiasmatic nuclei and the pineal and gut melatonin. Type Journal Article
  Year 2011 Publication Journal of Physiology and Pharmacology Abbreviated Journal  
  Volume 62 Issue Pages 269-274  
  Keywords Human Health; biological clock; chronodisruption; circadian rhythm; gastrointestinal melatonin; peptic ulcer; pineal gland; suprachiasmatic nucleus  
  Abstract Biological rhythms are essential for optimal health (1, 2). Throughout the course of human evolution, hominids were exposed to regularly alternating periods of light and dark during every 24-hour period. This evolutionary period, which for humans may have lasted for three million or more years, allowed species to take advantage of the light:dark cycle to adjust their physiology and to synchronize it with the prevailing light:dark environment. To take advantage of this information, vertebrates, including hominids, evolved a group of neurons to monitor the photoperiodic environment and to adjust organismal, organ and cellular function accordingly.

This paired group of light-responsive neurons is located in the mediobasal preoptic area at the diencephalic-telencephalic junction just anterior to the hypothalamus. Since these neurons lie immediately above the decussating axons of the optic nerve, i.e., the optic chiasma, they are named the suprachiasmatic nuclei (SCN) (3, 4). The SCN orchestrate all known circadian rhythms in vertebrates and are referred to as the master biological clock or the central rhythm generator.
 
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  Area (up) Expedition Conference  
  Notes Approved no  
  Call Number LoNNe @ christopher.kyba @ Serial 522  
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