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- Hahn, RobertKarolinska Institutet,Östergötlands Läns Landsting,Linköpings universitet,Avdelningen för läkemedelsforskning,Hälsouniversitetet,Anestesi- och operationkliniken US (author)
An Aggregate Urine Analysis Tool to Detect Acute Dehydration
- Article/chapterEnglish2013
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- Human Kinetics,2013
- printrdacarrier
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- LIBRIS-ID:oai:DiVA.org:liu-97670
- https://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-97670URI
- http://kipublications.ki.se/Default.aspx?queryparsed=id:223239678URI
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- Language:English
- Summary in:English
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- PURPOSE:Urine sampling has previously been evaluated for detecting dehydration in young male athletes. The present study investigated whether urine analysis can serve as a measure of dehydration in men and women of a wide age span.METHODS:Urine sampling and body weight measurement were undertaken before and after recreational physical exercise (median time: 90 minutes) in 57 volunteers aged between 17 and 69 years (mean age: 42). Urine analysis included urine color, osmolality, specific gravity, and creatinine.RESULTS:The volunteers' body weight decreased 1.1% (mean) while they exercised. There were strong correlations between all four urinary markers of dehydration (r = 0.73 to 0.84, P < 0.001). Researchers constructed a composite dehydration index graded from 1 to 6 based on these markers. This index changed from 2.70 before exercising to 3.55 after exercising, which corresponded to dehydration of 1.0% as given by a preliminary reference curve based on seven previous studies in athletes. Men were slightly dehydrated at baseline (mean: 1.9%) compared to women (mean: 0.7%; P < 0.001), while age had no influence on the results. A final reference curve that considered both the present results and the seven previous studies was constructed in which exercise-induced weight loss (x) was predicted by the exponential equation x= 0.20 dehydration index.CONCLUSION:Urine sampling can be used to estimate weight loss due to dehydration in adults up to the age of 70 years. A robust dehydration index based on four indicators reduces the influence of confounders.
Subject headings and genre
- urine color
- osmolality
- creatinine
- specific gravity
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- Waldréus, NanaSödertälje Hospital, Sweden (author)
- Linköpings universitetAvdelningen för läkemedelsforskning (creator_code:org_t)
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- In:International Journal of Sport Nutrition & Exercise Metabolism: Human Kinetics23:4, s. 303-3111526-484X1543-2742
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