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Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-64374

Rüst, Christoph Alexander; Knechtle, Beat; Joleska, Irena; Knechtle, Patrizia; Wirth, Andrea; Imoberdorf, Reinhard; Senn, Oliver; Rosemann, Thomas (2012). Is the prevalence of exercise-associated hyponatremia higher in female than in male 100-KM ultra-marathoners? Human Movement, 13(2):94-101.

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Purpose. The prevalence of exercise-associated hyponatremia (EAH) has mainly been investigated in male endurance athletes. The aim of the present study was to investigate the prevalence of EAH in female 100-km ultra-marathoners and to compare them to male ultra-runners since females are considered more at risk of EAH. Methods. Changes in body mass, hematocrit, [Na+] and [K+] levels in both plasma and urine, plasma volume, urine specific gravity, and the intake of energy, fluids and electrolytes was determined in 24 male and 19 female 100-km ultra-marathoners. Results. Three male (11%) and one female (5%) ultra-marathoners developed asymptomatic EAH. Body mass decreased, while plasma [Na+], plasma [K+] and hematocrit remained stable in either gender. Plasma volume, urine specific gravity and the potassium-to-sodium ratio in urine increased in either gender. In males, fluid intake was related to running speed (r = 0.50, p = 0.0081), but not to the change in body mass, in post-race plasma [Na+], in the change in hematocrit and in the change in plasma volume. Also in males, the change in hematocrit was related to both the change in plasma [Na+] (r = 0.45, p = 0.0187) and the change in the potassium-to-sodium ratio in urine (r = 0.39, p = 0.044). Sodium intake was neither related to post-race plasma [Na+] nor to the change in plasma volume. Conclusions. The prevalence of EAH was not higher in female compared to male 100-km ultra-marathoners. Plasma volume and plasma [Na+] were maintained and not related to fluid intake, most probably due to an activation of the reninangiotensin-aldosterone-system.




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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > University Hospital Zurich > Institute of General Practice
Dewey Decimal Classification:610 Medicine & health
Deposited On:30 Aug 2012 14:38
Last Modified:05 Apr 2016 15:56
Publisher DOI:10.2478/v10038-012-0009-2

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