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Peripheral atropinization does not change meal size controlled by prepyloric mechanisms
E A Rauhofer1, D Greenberg, G P Smith
1Department of Psychiatry, New York Hospital-Cornell Medical Center, White Plains, NY 10605, USA.
Physiology & Behavior
|February 1, 1996
Summary
Gastric contractility does not control meal size. Studies show atropine methyl nitrate did not affect food intake, suggesting prepyloric mechanisms regulate meal size independently of stomach contractions.
Area of Science:
- Physiology
- Neuroscience
- Gastroenterology
Background:
- Meal size is regulated by complex physiological mechanisms.
- Prepyloric mechanisms are involved in controlling food intake.
- The role of gastric contractility in this regulation is not fully understood.
Purpose of the Study:
- To investigate the role of gastric contractility in the prepyloric control of meal size.
- To determine if atropine methyl nitrate affects meal intake patterns.
Main Methods:
- Rats were administered atropine methyl nitrate or saline.
- Sucrose ingestion tests were conducted with a closed pylorus to isolate gastric effects.
- Food intake was measured over 30-minute intervals.
Main Results:
- Atropine methyl nitrate did not significantly alter 30-minute sucrose intake.
- Neither acute nor repetitive administration of atropine methyl nitrate changed intake patterns.
- Ingested sucrose accumulated in the stomach due to the closed pylorus.
Conclusions:
- Gastric contractile responses are not essential for prepyloric control of meal size.
- Prepyloric mechanisms regulate meal size independently of gastric motility.
- These findings contribute to understanding the neurophysiological control of appetite.