Document Detail

Effects of color temperature of illumination on physiological functions.
MedLine Citation:
PMID:  16079574     Owner:  NLM     Status:  MEDLINE    
This article presents our recent studies on the effects of color temperature on the taste sense and the influence of color temperature on bright light exposure during night rest period. Ten male Japanese and ten male Chinese were exposed to four illumination conditions (200, 1500 lx x 3000, 7500 K). Their taste threshold of four common tastes and amount of saliva were measured. It was found in both Japanese and Chinese subjects that sensitivities to sweet and bitter taste were decreased under the lower illuminance condition. Under the lower color temperature condition, sensitivity to bitter taste in Japanese and sweet taste in Chinese were decreased. Secretion of saliva increased under the lower illuminance condition in both Japanese and Chinese. Only in Chinese subjects, secretion of saliva increased under the lower color temperature condition. In a separate experiment, six male Japanese students were subjected to bright light exposure during a night rest period. They performed a mental task from 23:00 h till 02:00 h, and took a rest from 00:00 h to 01:00 h. During the rest period they were exposed to bright light (3000 lx) of three different color temperatures: 3000 K, 5000 K, and 7000 K. After exposure to bright light of 3000 K but not at other color temperatures, the EEG alpha1 band ratio and the beta band ratio at 02:00 h were higher and lower, respectively, than that at 01:00 h. These findings indicated that lower color temperature bright light exposure during a night rest break led to a reduction of subjects' arousal level during the subsequent work. Herein, we discuss these results from the viewpoint of physiological anthropology.
Tetsuo Katsuura; Xinqin Jin; Yasushi Baba; Yoshihiro Shimomura; Koichi Iwanaga
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of physiological anthropology and applied human science     Volume:  24     ISSN:  1345-3475     ISO Abbreviation:  J Physiol Anthropol Appl Human Sci     Publication Date:  2005 Jul 
Date Detail:
Created Date:  2005-08-04     Completed Date:  2005-10-20     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  100930389     Medline TA:  J Physiol Anthropol Appl Human Sci     Country:  Japan    
Other Details:
Languages:  eng     Pagination:  321-5     Citation Subset:  IM    
Ergonomics Section, Faculty of Engineering, Chiba University, Chiba, Japan.
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MeSH Terms
Analysis of Variance
Arousal / radiation effects*
Salivation / radiation effects
Taste / radiation effects*
Time Factors

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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