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Gastrointestinal disturbances in marathon runners
F A Halvorsen1, J Lyng, T Glomsaker
1Department of Medicine, Buskerud Central Hospital, Drammen, Norway.
British Journal of Sports Medicine
|December 1, 1990
Summary
Long-distance running often causes dietary changes and altered bowel habits in marathon runners. Gastrointestinal issues are common, with some runners experiencing performance impairment.
Area of Science:
- Sports Medicine
- Gastroenterology
- Exercise Physiology
Background:
- Gastrointestinal (GI) disturbances are frequently reported by athletes participating in endurance events.
- Understanding the prevalence and impact of these issues is crucial for athlete health and performance.
Purpose of the Study:
- To investigate the prevalence of GI disturbances in leisure-time marathon runners.
- To assess the effects of running on weight, diet, and pre-existing digestive problems.
- To determine the impact of GI issues on running performance.
Main Methods:
- A questionnaire was administered to 279 leisure-time marathon runners.
- The survey collected data on dietary changes, weight reduction, bowel habits, and GI symptoms during/after running.
- Participants also reported on pre-existing GI conditions and their response to training.
Main Results:
- 37% reported dietary changes, 38% experienced weight reduction, and 48% noted altered bowel habits (looser stools/more frequent defecation).
- A quarter of runners had prior long-lasting GI problems, with 41% improving after training.
- 34% experienced GI disturbances during or after running, with 20% reporting performance impairment.
Conclusions:
- Marathon running is associated with significant prevalence of GI disturbances, including altered bowel habits and dietary changes.
- Regular training may improve pre-existing GI conditions in some runners.
- GI disturbances can negatively impact marathon running performance for a notable percentage of athletes.