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Gastrointestinal transit during mild exercise.

W F Keeling1, B J Martin

  • 1Physiology Section, Indiana University, Bloomington 47405.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|September 1, 1987
PubMed
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Mild exercise significantly speeds up the movement of liquid meals through the gastrointestinal tract. This study found that walking accelerated mouth-to-cecum transit time in healthy subjects.

Area of Science:

  • Gastroenterology
  • Exercise Physiology

Background:

  • Constipation management often includes exercise, but its effect on gastrointestinal transit is poorly understood.
  • Investigating the impact of physical activity on the rate of material movement within the digestive system is crucial.

Purpose of the Study:

  • To determine how mild exercise influences the transit time of a liquid meal from the mouth to the large intestine.
  • To quantify the effect of exercise on gastrointestinal motility.

Main Methods:

  • 12 healthy subjects ingested a liquid meal containing lactulose.
  • Orocecal transit time was measured using hydrogen (H2) breath analysis during seated rest and treadmill exercise (5.6 km/h, 2% grade).
  • Physiological parameters including heart rate, oxygen uptake (VO2), and rectal temperature were monitored.

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Main Results:

  • Mild exercise significantly reduced mouth-to-cecum transit time (44 min) compared to rest (66 min).
  • Exercise increased heart rate, VO2, and rectal temperature, indicating moderate physical exertion.
  • The acceleration of transit was more pronounced in subjects with slower resting transit rates.

Conclusions:

  • Mild exercise accelerates the transit of liquid meals through the upper gastrointestinal tract.
  • The findings support the role of physical activity in enhancing gastrointestinal motility.
  • Further research can explore exercise's impact on different meal compositions and populations.