Serum biochemistry and morbidity among runners presenting for medical care after an Australian mountain ultramarathon

Clin J Sport Med. 2007 Jul;17(4):307-10. doi: 10.1097/JSM.0b013e31804c77da.


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.

MeSH terms

  • Adult
  • Biochemical Phenomena
  • Biochemistry
  • Emergency Medical Services*
  • Female
  • Humans
  • Hyponatremia / diagnosis
  • Hyponatremia / epidemiology
  • Hyponatremia / etiology
  • Hyponatremia / therapy
  • Male
  • Middle Aged
  • New South Wales / epidemiology
  • Physical Exertion / physiology*
  • Running / physiology*
  • Serum / chemistry*