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Integration of different types of biological signals –bowel sound and salivary amylase–

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  2010 Pittsburgh, Pennsylvania, June 20 - June 23, 2010  1009687.(doi:10.13031/2013.29981)
Authors:   Osamu Sakata, Takaaki Satake
Keywords:   bowel sound, salivary amylase, psychological stress, digestive activity, food design

The human bowel produces bowel sounds characteristic of digestive activity. The changes in digestive activity of the bowel are reflected in the frequency and intensity of peristaltic action, and indirectly in variation in bowel sound. Approaching this process in reverse, we detected changes in bowel sound to capture variation in digestive activity of the bowel, aiming to develop a quantitative monitoring technique to trace the cause of the bowel sound variation back to a difference in consumed foods or to compatibility between the food and the individual. In order to collect the basic data for developing such a technique, we carried out two experiments. Experiment 1 was an examination of stress caused by bowel sound recording. Experiment 2 was an investigation of the relation between occurrence frequency of bowel sounds and quantity of salivary amylase. The results of the two experiments suggested as follows. The quantity of salivary amylase increased after the beginning of bowel sound recording, that is, bowel sound recording just causes psychological stress. The obvious synchronization between the trend of occurrence frequency of bowel sounds and the decrease or increase of salivary amylase was not observed.

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