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Circulating gastrointestinal hormone changes in marathon running

A M O'Connor1, C F Johnston, K D Buchanan

  • 1Department of Medicine, Queen's University of Belfast, N. Ireland.

International Journal of Sports Medicine
|July 1, 1995
PubMed
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Marathon running significantly alters gastrointestinal hormone levels, with most hormones increasing post-race. However, these hormonal changes were not directly linked to gastrointestinal distress experienced by runners.

Area of Science:

  • Exercise Physiology
  • Gastroenterology
  • Endocrinology

Background:

  • Marathon running is known to cause gastrointestinal disturbances.
  • The role of gastrointestinal hormones in exercise-induced GI symptoms is not fully understood.

Purpose of the Study:

  • To investigate the impact of marathon running on gastrointestinal hormone release.
  • To determine if changes in gastrointestinal hormones correlate with gastrointestinal disturbances during a marathon.

Main Methods:

  • Blood samples were collected from 26 marathon runners before, immediately after, and 30 minutes post-race.
  • Concentrations of vasoactive intestinal polypeptide, gastrin, secretin, pancreatic polypeptide, neurokinin A, pancreastatin, insulin, and glucagon-like peptide 1 were measured.
  • Gastrointestinal symptoms reported by runners were recorded.

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Main Results:

  • Circulating concentrations of most measured gastrointestinal hormones (excluding insulin) significantly increased after the marathon.
  • No significant changes in blood glucose levels were observed immediately after the race.
  • Statistical analysis showed no direct correlation between elevated hormone levels and the incidence of gastrointestinal symptoms.

Conclusions:

  • Marathon running demonstrably affects gastrointestinal hormone concentrations.
  • The study did not find a direct link between exercise-induced hormonal shifts and gastrointestinal distress in marathon runners.
  • Further research is needed to elucidate the mechanisms of release and functional roles of these hormones during endurance events.