An aggregate urine analysis tool to detect acute dehydration

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Hahn, RGKarolinska Institutet (författare)

An aggregate urine analysis tool to detect acute dehydration

Artikel/kapitelEngelska2013

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Human Kinetics,2013

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LIBRIS-ID:oai:prod.swepub.kib.ki.se:127281816
http://kipublications.ki.se/Default.aspx?queryparsed=id:127281816URI
https://doi.org/10.1123/ijsnem.23.4.303DOI

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Språk:engelska
Sammanfattning på:engelska

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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 min) in 57 volunteers age 17–69 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 4 urinary markers of dehydration (r = .73–.84, p < .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 7 previous studies in athletes. Men were slightly dehydrated at baseline (mean: 1.9%) compared with women (mean: 0.7%; p < .001), though age had no influence on the results. A final reference curve that considered both the present results and the 7 previous studies was constructed in which exercise-induced weight loss (x) was predicted by the exponential equation x = 0.20 dehydration index1.86.Conclusion:Urine sampling can be used to estimate weight loss due to dehydration in adults up to age 70. A robust dehydration index based on four indicators reduces the influence of confounders.

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Waldreus, N (författare)
Karolinska Institutet (creator_code:org_t)

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Ingår i:International journal of sport nutrition and exercise metabolism: Human Kinetics23:4, s. 303-3111543-27421526-484X

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International journal of sport nutrition and exercise metabolism (Sök värdpublikationen i LIBRIS)

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Av författaren/redakt...: Hahn, RG; Waldreus, N

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Av lärosätet: Karolinska Institutet

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