Biological variation and diagnostic accuracy of dehydration assessment markers

The American Journal of Clinical Nutrition
Samuel N CheuvrontMichael N Sawka

Abstract

Well-recognized markers for static (one time) or dynamic (monitoring over time) dehydration assessment have not been rigorously tested for their usefulness in clinical, military, and sports medicine communities. This study evaluated the components of biological variation and the accuracy of potential markers in plasma, urine, saliva, and body mass (B(m)) for static and dynamic dehydration assessment. We studied 18 healthy volunteers (13 men and 5 women) while carefully controlling hydration and numerous preanalytic factors. Biological variation was determined over 3 consecutive days by using published methods. Atypical values based on statistical deviations from a homeostatic set point were examined. Measured deviations in body fluid were produced by using a separate, prospective dehydration experiment and evaluated by receiver operating characteristic (ROC) analysis to quantify diagnostic accuracy. All dehydration markers displayed substantial individuality and one-half of the dehydration markers displayed marked heterogeneity of intraindividual variation. Decision levels for all dehydration markers were within one SD of the ROC criterion values, and most levels were nearly identical to the prospective group means after volunt...Continue Reading

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Citations

Jan 21, 2011·European Journal of Applied Physiology·Kurt J SollanekRobert S Axtell
Apr 7, 2012·European Journal of Applied Physiology·Samuel N CheuvrontMichael N Sawka
Jun 22, 2012·The British Journal of Nutrition·Nathalie ProssLaurent Le Bellego
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