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Low prevalence of exercise-associated hyponatremia in male 100km ultra-marathon runners in Switzerland

Knechtle, Beat ; Knechtle, Patrizia ; Rosemann, Thomas

In: European Journal of Applied Physiology, 2011, vol. 111, no. 6, p. 1007-1016

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    Titre
    • Low prevalence of exercise-associated hyponatremia in male 100km ultra-marathon runners in Switzerland
    Auteur
    • Knechtle, Beat. Facharzt FMH für Allgemeinmedizin, Gesundheitszentrum St. Gallen, Vadianstrasse 26, 9001, St. Gallen, Switzerland
    • Knechtle, Patrizia. Facharzt FMH für Allgemeinmedizin, Gesundheitszentrum St. Gallen, Vadianstrasse 26, 9001, St. Gallen, Switzerland
    • Rosemann, Thomas. Institute of General Practice and Health Services Research, University of Zurich, Zurich, Switzerland
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • European Journal of Applied Physiology, 2011, vol. 111, no. 6, p. 1007-1016. Springer-Verlag
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:314573
    Summary
    We investigated the prevalence of exercise-associated hyponatremia (EAH) in 145 male ultra-marathoners at the ‘100-km ultra-run' in Biel, Switzerland. Changes in body mass, urinary specific gravity, haemoglobin, haematocrit, plasma [Na+], and plasma volume were determined. Seven runners (4.8%) developed asymptomatic EAH. Body mass, haematocrit and haemoglobin decreased, plasma [Na+] remained unchanged and plasma volume increased. Δ body mass correlated with both post race plasma [Na+] and Δ plasma [Na+]. Δ plasma volume was associated with post race plasma [Na+]. The athletes consumed 0.65 (0.30) L/h; fluid intake correlated significantly and negatively (r=−0.50, p<0.0001) to race time. Fluid intake was neither associated with post race plasma [Na+] nor with Δ plasma [Na+], but was related to Δ body mass. To conclude, the prevalence of EAH was low at ~5% in these male 100km ultra-marathoners. EAH was asymptomatic and would not have been detected without the measurement of plasma [Na+]