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Gastric Phase of Digestion

Gastric Phase of Digestion

The gastric phase of digestion begins as soon as food enters the stomach. The incoming food bolus triggers neural and hormonal mechanisms, which last approximately 3 to 4 hours. During this phase, the stomach undergoes significant changes to prepare the food for further digestion and absorption.
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Intestinal Phase of Digestion

The intestinal phase of digestion is the third and final stage of the digestive process, occurring after the cephalic and gastric phases. It begins when chyme, a partially digested mixture of food and digestive enzymes, enters the small intestine from the stomach. This phase is crucial for nutrient absorption and involves complex hormonal and enzymatic interactions.
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Imaging Studies III: Gastrointestinal Motility Studies and Virtual Colonoscopy

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Gastric Motility

Gastric Motility

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Cephalic Phase of Digestion

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The process of digestion is composed of three stages – cephalic, gastric, and intestinal – each with a distinct control center. The cephalic phase is the first stage, and it starts even before the food enters the stomach. It is controlled by the central nervous system and is initiated by any food-related sensory stimuli, such as the sight and smell of food, which send signals to the brain. While eating, the taste receptors intensify these signals, which travel to the cerebral cortex and then to...

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Related Experiment Video

Updated: Jul 3, 2026

Gastric Point of Care Ultrasound in Adults: Image Acquisition and Interpretation

Gastric Point of Care Ultrasound in Adults: Image Acquisition and Interpretation

Published on: September 22, 2023

Study on gastric interdigestive pressure activity based on phase space reconstruction and FastICA algorithm.

Biao Huang¹, Guozheng Yan, Peng Zan

¹No. 820 Lab., Department of Instrument, Shanghai Jiaotong University, No. 800 Dongchuan Road, 200240 Shanghai, China. huangb@sjtu.edu.cn

Medical Engineering & Physics

|August 2, 2008

Summary

This study introduces a new method to analyze gastric motility using a wireless capsule and advanced signal processing. The technique effectively identifies distinct gastric contractions for better understanding digestive health.

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Area of Science:

Gastroenterology
Physiology
Biomedical Engineering

Background:

Gastric motility is crucial for digestion.
Existing methods for measuring gastric pressure activity have limitations.
Single-dimensional data may obscure complex physiological processes.

Purpose of the Study:

To develop and validate a novel method for analyzing gastric interdigestive pressure activity.
To improve the characterization of gastric contractions.
To investigate advanced signal processing techniques for physiological data.

Main Methods:

Development of a wireless radiotelemetry capsule for pressure data acquisition.
Application of automated embedding phase space reconstruction.
Utilizing FastICA (Fast Independent Component Analysis) for component separation.
Employing the Hilbert-Huang transform for detailed analysis.

Main Results:

The wireless capsule successfully recorded gastric pressure activity.
Phase space reconstruction and FastICA effectively separated interdependent components.
The Hilbert-Huang transform provided insights into gastric motility characteristics.
The proposed integrated method demonstrated effectiveness in analyzing gastric pressure series.

Conclusions:

The developed wireless telemetry system combined with advanced signal processing offers a powerful tool for studying gastric motility.
This approach enhances the understanding of normal physiological conditions of the stomach.
The findings support the utility of this method for future gastrointestinal research.