Serum Biochemistry and Morbidity Among Runners Presenting for Medical Care After an Australian Mountain Ultramarathon

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Objective:To determine if exercise-associated hyponatremia (EAH) was a cause of morbidity among runners requiring medical care at an Australian mountain ultramarathon.Design:Case series.Setting:Six Foot Track mountain ultramarathon, New South Wales, Australia, March 2006.Patients:Runners presenting to the medical facility.Assessment:Serum biochemistry.Results:No cases of exercise-associated hyponatremia were identified among 9 athletes (from 775 starters) who were treated with intravenous fluid therapy. Unwell runners had a mean serum (Na) of 143 mmol/L (range 138-147mmol/L). All runners tested had elevated serum urea and creatinine concentrations.Conclusion:In this setting, EAH was not a significant cause of morbidity.

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