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Do ultra-runners in a 24-h run really dehydrate?

Knechtle, B. ; Wirth, A. ; Knechtle, P. ; Rosemann, T. ; Senn, O.

In: Irish Journal of Medical Science, 2011, vol. 180, no. 1, p. 129-134

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    Titre
    • Do ultra-runners in a 24-h run really dehydrate?
    Auteur
    • Knechtle, B.. Gesundheitszentrum St. Gallen, Vadianstrasse 26, 9001, St. Gallen, Switzerland
    • Wirth, A.. Gesundheitszentrum St. Gallen, Vadianstrasse 26, 9001, St. Gallen, Switzerland
    • Knechtle, P.. Gesundheitszentrum St. Gallen, Vadianstrasse 26, 9001, St. Gallen, Switzerland
    • Rosemann, T.. Institute of General Practice and for Health Services Research, University of Zurich, Zurich, Switzerland
    • Senn, O.. Institute of General Practice and for Health Services Research, University of Zurich, Zurich, Switzerland
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Irish Journal of Medical Science, 2011, vol. 180, no. 1, p. 129-134. Springer-Verlag
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:309786
    Summary
    Background: Loss of body mass during a 24-h run was considered to be a result of dehydration. Aims: We intended to quantify the decrease in body mass as a loss in fat mass or skeletal muscle mass and to quantify the change in hydration status. Methods: Body mass, fat mass, skeletal muscle mass, haematocrit, plasma sodium and urinary specific gravity were measured in 15 ultra-marathoners in a 24-h run. Results: Body mass decreased by 2.2kg (p=0.0009) and fat mass decreased by 0.5kg (p=0.0084). The decrease in body mass correlated to the decrease in fat mass (r=0.72, p=0.0024). Urinary specific gravity increased from 1.012 to 1.022g/mL (p=0.0005). Conclusions: The decrease in body mass and the increase in urinary specific gravity indicate dehydration. The decrease in body mass was correlated to the decrease in fat mass and therefore not only due to dehydration