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Fecal bile acid concentration in distance runners
W H Sutherland1, E R Nye, D J Macfarlane
1Department of Medicine, University of Otago, Dunedin, New Zealand.
International Journal of Sports Medicine
|December 1, 1991
Summary
Male distance runners have lower fecal bile acid concentrations, likely due to higher fiber intake. This may explain the reduced colon cancer risk observed in physically active individuals.
Area of Science:
- Gastroenterology
- Exercise Physiology
- Nutritional Science
Background:
- Physically active individuals, such as distance runners, often exhibit different physiological markers compared to sedentary populations.
- Dietary habits, particularly fiber intake, significantly influence gut function and fecal composition.
- Fecal bile acids are implicated in various gastrointestinal processes and diseases, including colon cancer.
Purpose of the Study:
- To investigate differences in fecal bile acid concentration and other fecal characteristics between male distance runners and sedentary men.
- To explore the relationship between habitual food intake, particularly dietary fiber, and fecal bile acid levels in these groups.
- To assess the impact of exercise on bowel habits and its potential implications for colon health.
Main Methods:
- Cross-sectional study comparing 14 male distance runners and 14 sedentary men.
- Measurement of fecal bile acid concentration, stool weight, and frequency of defecation.
- Assessment of habitual food intake, including fiber, carbohydrate, and protein consumption.
Main Results:
- Distance runners exhibited significantly lower fecal bile acid concentrations (p < 0.05) and higher stool weight, defecation frequency, and intake of fiber, carbohydrate, and protein (p < 0.01).
- After adjusting for dietary fiber intake, the difference in fecal bile acid concentration between groups was no longer significant.
- Frequency of defecation remained significantly higher in runners even after adjusting for fiber intake.
Conclusions:
- Lower fecal bile acid concentration in distance runners is primarily attributed to dilution effects from higher dietary fiber consumption.
- Increased frequency of defecation in runners persists independently of dietary fiber intake.
- These findings suggest a potential link between physical activity, dietary fiber, and reduced colon cancer risk through modulation of fecal composition and bowel habits.