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Author (up) Lee, S., Matsumori, K., Nishimura, K., Nishimura, Y., Ikeda, Y., Eto, T., & Higuchi, S. url  doi
  Title Melatonin suppression and sleepiness in children exposed to blue-enriched white LED lighting at night Type Journal Article
  Year 2018 Publication Physiological Reports Abbreviated Journal  
  Volume 6 Issue 24 Pages  
  Keywords Human Health  
  Abstract Light-induced melatonin suppression in children is reported to be more sensitive to white light at night than that in adults; however, it is unclear whether it depends on spectral distribution of lighting. In this study, we investigated the effects of different color temperatures of LED lighting on children’s melatonin secretion during the night. Twenty-two healthy children (8.9  2.2 years old) and 20 adults (41.7  4.4 years old) participated in this

study. A between-subjects design with four combinations, including two age

groups (adults and children) and the two color temperature conditions

(3000 K and 6200 K), was used. The experiment was conducted for two consecutive nights. On the first night, saliva samples were collected every hour

under a dim light condition (<30 lx). On the second night, the participants

were exposed to either color temperature condition. Melatonin suppression in

children was greater than that in adults at both 3000 K and 6200 K condition.

The 6200 K condition resulted in greater melatonin suppression than did the

3000 K condition in children (P < 0.05) but not in adults. Subjective sleepiness in children exposed to 6200 K light was significantly lower than that in

children exposed to 3000 K light. In children, blue-enriched LED lighting has

a greater impact on melatonin suppression and it inhibits the increase in

sleepiness during night. Light with a low color temperature is recommended

at night, particularly for children’s sleep and circadian rhythm.
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  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number IDA @ intern @ Serial 2312  
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