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 138-147 mmol/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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http://dx.doi.org/10.1097/JSM.0b013e31804c77daDOI Listing

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