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Exercise-associated hyponatremia in an ultra-endurance mountain biker: a case report
Morteza Khodaee1, Dylan Luyten2, Tamara Hew-Butler3
1University of Colorado School of Medicine, Aurora, Colorado.
Abstract:
Symptomatic exercise-associated hyponatremia (EAH), which is relatively common among marathon runners, is an uncommon event among ultra-endurance athletes. A 44-year-old man presented to the emergency department with increased thirst after successfully completing a 100-mile mountain bike race in Leadville, Colorado. Initial laboratory tests revealed a blood sodium level of 116 mEq/L. The primary etiologic factor in EAH is fluid consumption in excess of fluid losses in prolonged exertion. Early diagnosis and management is crucial to prevent cerebral and pulmonary edema.
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