Dehydration is how you define it: comparison of 318 blood and urine athlete spot checks

BMJ Open Sport & Exercise Medicine
Tamara D Hew-ButlerMelissa VanderMeulen

Abstract

Clinical medicine defines dehydration using blood markers that confirm hypertonicity (serum sodium concentration ([Na+])>145 mmol/L) and intracellular dehydration. Sports medicine equates dehydration with a concentrated urine as defined by any urine osmolality (UOsm) ≥700 mOsmol/kgH2O or urine specific gravity (USG) ≥1.020. To compare blood versus urine indices of dehydration in a cohort of athletes undergoing routine screenings. 318 collegiate athletes (193 female) provided blood and urine samples and asked to rate how thirsty they were on a 10-point visual analogue scale. Serum was analysed for [Na+], while serum and UOsm were measured using an osmometer. USG was measured using a Chemstrip. Data were categorised into dehydrated versus hydrated groupings based on these UOsm and USG thresholds. Using UOsm ≥700 mOsmol/kgH2O to define dehydration, 55% of athletes were classified as dehydrated. Using any USG ≥1.020 to define dehydration, 27% of these same athletes were classified as dehydrated. No athlete met the clinical definition for dehydration (hypertonicity; serum [Na+]>145 mmol/L). Normonatremia (serum [Na+] between 135 mmol/L and 145 mmol/L) was maintained in 99.7% of athletes despite wide variation in UOsm (110-1298 mOsmo...Continue Reading

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Nov 7, 2019·Multidisciplinary Respiratory Medicine·Ronald Eccles, Pascal Mallefet
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Dec 30, 2020·Journal of Paediatrics and Child Health·Nur FaidahBurhanuddin Bahar

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Methods Mentioned

BETA
blood draw

Software Mentioned

Statistica

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