Abstract
ObjectiveConstipation negatively affects the quality of life by causing abdominal pain and distention. It is common among women and older individuals and frequently encountered in Japan. Coffee and soda ingestion promote gastrointestinal motility; therefore, both liquids are considered effective for alleviating constipation. While invasive approaches or large-scale equipment, such as magnetic resonance imaging and radiography, are needed to confirm their effect on gastrointestinal motility, bowel sound (BS) assessment can be easily and non-invasively performed using low-cost equipment. Differently to coffee, soda contains carbon dioxide and its ingestion may therefore increase gastrointestinal gas and in turn affect the BS generation process. However, the relationship between gastrointestinal gas and acoustic BS features has not yet been investigated. This study aimed to investigate the effect of increased gastrointestinal gas resulting from soda ingestion on the acoustic BS features extracted using a newly improved BS detection technique. MethodsWe used BS-based acoustic features, including number of BSs detected/min, BS length, and BS power, extracted via an artificial neural network-based BS detection approach, which was developed in a previous study and here improved. ResultsBSs detected/min and BS length significantly increased after, compared with before, coffee and soda intake. Furthermore, we found that longer BSs (>128 ms) were more significantly associated with soda (200 mL) intake than with coffee (200 mL) intake. ConclusionsBS length and BSs detected/min can sensitively evaluate gastrointestinal motility, and BS length may reflect information on gastrointestinal gas in addition to gastrointestinal motility. Recording of BS-based acoustic features is a non-invasive and convenient means to evaluate the effects of liquid intake on gastrointestinal motility in patients with functional gastrointestinal disorders.
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