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Higher prevalence of exercise-associated hyponatremia in female than in male open-water ultra-endurance swimmers: the ‘Marathon-Swim' in Lake Zurich

Wagner, Sandra ; Knechtle, Beat ; Knechtle, Patrizia ; Rüst, Christoph ; Rosemann, Thomas

In: European Journal of Applied Physiology, 2012, vol. 112, no. 3, p. 1095-1106

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    Titel
    • Higher prevalence of exercise-associated hyponatremia in female than in male open-water ultra-endurance swimmers: the ‘Marathon-Swim' in Lake Zurich
    Autor
    • Wagner, Sandra. Institute of General Practice and Health Services Research, University of Zurich, Zurich, Switzerland
    • Knechtle, Beat. Institute of General Practice and Health Services Research, University of Zurich, Zurich, Switzerland
    • Knechtle, Patrizia. Gesundheitszentrum St. Gallen, Vadianstrasse 26, 9001, St. Gallen, Switzerland
    • Rüst, Christoph. Institute of General Practice and Health Services Research, University of Zurich, Zurich, Switzerland
    • Rosemann, Thomas. Institute of General Practice and Health Services Research, University of Zurich, Zurich, Switzerland
    Dokumententyp
    • Postprint
    Sprache
    • Englisch
    Veröffentlicht in
    • European Journal of Applied Physiology, 2012, vol. 112, no. 3, p. 1095-1106. Springer-Verlag
    Andere elektronische Ausgabe
    OAI-PMH-ID
    • oai:doc.rero.ch:313594
    Summary
    We investigated the prevalence of exercise-associated hyponatremia (EAH) in 25 male and 11 female open-water ultra-endurance swimmers participating in the ‘Marathon-Swim' in Lake Zurich, Switzerland, covering a distance of 26.4km. Changes in body mass, fat mass, skeletal muscle mass, total body water, urine specific gravity, plasma sodium concentration [Na+] and haematocrit were determined. Two males (8%) and four females (36%) developed EAH where one female was symptomatic with plasma sodium [Na+] of 127mmol/L. Body mass and plasma [Na+] decreased (p<0.05). The changes in body mass correlated in both male and female swimmers to post-race plasma [Na+] (r=−0.67, p=0.0002 and r=−0.80, p=0.0034, respectively) and changes in plasma [Na+] (r=−0.68, p=0.0002 and r=−0.79, p=0.0039, respectively). Fluid intake was neither associated with changes in body mass, post-race plasma [Na+] or the change in plasma [Na+]. Sodium intake showed no association with either the changes in plasma [Na+] or post-race plasma [Na+]. We concluded that the prevalence of EAH was greater in female than in male open-water ultra-endurance swimmers