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Hyponatremia In A Cold Weather Ultraendurance Race, Kristin J. Stuempfle, Donald R. Lehmann, H. Samuel Case, Stephen Bailey, Sherri Lind Hughes, Jennifer Mckenzie, Deborah Evans
Hyponatremia In A Cold Weather Ultraendurance Race, Kristin J. Stuempfle, Donald R. Lehmann, H. Samuel Case, Stephen Bailey, Sherri Lind Hughes, Jennifer Mckenzie, Deborah Evans
Health Sciences Faculty Publications
We assessed the incidence and etiology of hyponatremia in the 100-mile (161 km) Iditasport ultramarathon. Subjects (8 cyclists, 8 runners) were weighed and serum sodium was measured pre- and post-race. Race diets were analyzed to determine fluid and sodium consumption. Subjects were split by post-race serum sodium concentration into hyponatremic and normonatremic groups for statistical analyses. Seven of 16 subjects (44%) were hyponatremic. The hyponatremic group exhibited a significant decrease in serum sodium concentration (137.0 to 132.9 mmol/L, and the normonatremic group experienced a significant decrease in weight (82.1 to 80.2 kg) pre- to post-race. The hypornatremic group drank more …