The Influence of Taste Stimuli and Illumination on Electrogastrogram Measurements

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概要

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• 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 conditions×4 taste stimuli). The four lighting conditions were set by combinations of illuminance levels of 200 and 1500lx and color temperatures of 3000 and 7500K. 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.

• 日本生理人類学会の論文

著者

• SHIMOMURA Yoshihiro

  Faculty of Engineering, Chiba University

• IWANAGA Koichi

  Graduate School of Science and Technology, Chiba University

• KATSUURA Tetsuo

  Faculty of Engineering, Chiba University

• Katsuura Tetsuo

  Faculty Of Engineering Chiba University

• Shimomura Yoshihiro

  Graduate School Of Engineering Chiba University

• Shiomura Yoshihiro

  Faculty Of Engineering Chiba University

• Jin Xingin

  Faculty Of Engineering Chiba University

• Inoue Manabu

  Research & Development Center Lighting Company Matsushita Electric Works Ltd.

• Iwanaga Koichi

  Graduate School Of Engineering Chiba University

• JIN Xinqin

  Faculty of Engineering, Chiba University

• Inoie Manabu

  Research & Development Center, Lighting Company, Matsushita Electric Works, Ltd.

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