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Effects of physical exercise on colonic motor activity
1Department of Surgery, Medical College of Wisconsin, Milwaukee.
The American Journal of Physiology
|April 1, 1991
Summary
Physical exercise impacts canine colonic motor activity. Exercise reduced migrating motor complexes in fasted states but disrupted them in fed states, often triggering defecation via giant migrating contractions.
Area of Science:
- Gastroenterology
- Physiology
- Exercise Science
Background:
- Colonic motor activity is crucial for gastrointestinal function.
- The influence of physical exercise on colonic motility, particularly in different physiological states (fasted vs. fed), requires further elucidation.
Purpose of the Study:
- To investigate the effects of physical exercise on colonic motor activity in dogs.
- To differentiate the impact of exercise in fasted versus fed states on colonic motility patterns.
Main Methods:
- Six conscious dogs were instrumented with strain gauge transducers to monitor colonic motor activity.
- Exercise was performed on a treadmill (1 hour at 5 km/h) during fasted and fed states (1st, 3rd, and 5th postprandial hours).
Main Results:
- Exercise decreased the frequency of colonic migrating motor complexes (MMCs) in the fasted state.
- In the fed state, exercise disrupted MMCs, induced non-migrating motor complexes, and increased contractile activity.
- Exercise triggered giant migrating contractions (GMCs) leading to defecation in both fasted and fed states.
Conclusions:
- Physical exercise significantly alters colonic motor patterns, with distinct effects in fasted and fed conditions.
- Exercise-induced GMCs play a role in defecation and colonic mass movements.