Orocecal transit during mild exercise in women

Area of Science:

• Exercise physiology
• Gastroenterology
• Human physiology

Background:

• The impact of exercise on gastrointestinal transit and hormone levels is not well understood.
• Investigating the relationship between exercise, gastrointestinal hormones, and food movement is crucial for understanding digestive health during physical activity.

Purpose of the Study:

• To examine the effect of mild exercise on orocecal transit time in women.
• To investigate the association between gastrointestinal hormones (motilin, gastrin, cortisol) and transit rate during exercise.

Main Methods:

• 21 women ingested lactulose in a liquid meal, and orocecal transit was measured using expired hydrogen (H2) levels.
• Measurements were taken during seated rest and treadmill exercise (5.6 km/h, 2% grade).
• Peripheral venous blood samples were analyzed for motilin, gastrin, and cortisol levels.

Main Results:

• Mild exercise significantly reduced orocecal transit time from 98 minutes at rest to 75 minutes during exercise (P < 0.001).
• Exercise increased heart rate, oxygen uptake, and rectal temperature.
• Faster transit during exercise correlated with elevated cortisol levels, while gastrin and motilin remained unchanged.

Conclusions:

• Mild, concurrent exercise accelerates the orocecal transit of non-absorbable carbohydrates in liquid meals in women.
• The mechanism behind exercise-induced acceleration of gastrointestinal transit is unclear but may involve the stress response.
• Further research is needed to elucidate the precise physiological mechanisms linking physical activity and digestive transit.