Document Detail

The influence of taste stimuli and illumination on electrogastrogram measurements.
MedLine Citation:
PMID:  17435364     Owner:  NLM     Status:  MEDLINE    
An electrogastrogram (EGG) is considered to be an index to the autonomic nervous system of the digestive organs. In the present study, we attempted to clarify whether or not an EGG can be used to evaluate the influence of illumination, and what kinds of effect taste stimuli and illumination have on the autonomic nervous system. In this study, we used the ratio of the normal wave component of the EGG (EGG-NR: 2-4.5 cpm power/1-10 cpm power) and the amplitude of a normal wave (EGG-NI: integrated EGG of 2-4.5 cpm). Thirteen healthy males participated in 16 experimental conditions (4 lighting conditionsx4 taste stimuli). The four lighting conditions were set by combinations of illuminance levels of 200 and 1500 lx and color temperatures of 3000 and 7500 K. The four taste stimuli were sweet (glucose), salty (salt), sour (acetic acid), and bitter (quinine). The changes in EGG-NR and EGG-NI were compared for different taste conditions. The results showed that EGG-NI was not significantly affected by the different taste conditions. However, the main effect of taste on EGG-NR was significant: sweet and salty tastes were significantly higher than the bitter taste. EGG-NR and EGG-NI in different lighting conditions were also compared. The main effect of different color temperatures was also significant, but the illuminance level did not affect EGG-NR. EGG-NR increased significantly at the lower color temperature. On the other hand, EGG-NI significantly increased at the lower illuminance. These results suggest that parasympathetic nervous activity has a predominant effect on gastric activity in different lighting environments. Therefore, EGG measurements may be useful indicators for illumination environment studies.
Xinqin Jin; Tetsuo Katsuura; Koichi Iwanaga; Yoshihiro Shimomura; Manabu Inoie
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Publication Detail:
Type:  Evaluation Studies; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of physiological anthropology     Volume:  26     ISSN:  1880-6791     ISO Abbreviation:  -     Publication Date:  2007 Mar 
Date Detail:
Created Date:  2007-04-16     Completed Date:  2007-05-18     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101269653     Medline TA:  J Physiol Anthropol     Country:  Japan    
Other Details:
Languages:  eng     Pagination:  191-5     Citation Subset:  IM    
Faculty of Engineering, Graduate School of Science and Technology, Chiba University, Japan.
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MeSH Terms
Autonomic Nervous System / physiology*
Electrophysiology / instrumentation*
Taste / physiology*

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