Comparison of 3 methods to assess urine specific gravity in collegiate wrestlers

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Deutscher übersetzter Titel:Vergleich dreier Methoden zur Messung der Urindichte bei College-Ringern
Autor:Stuempfle, Kristin J.; Drury, Daniel G.
Erschienen in:Journal of athletic training
Veröffentlicht:38 (2003), 4, S. 315-319, Lit.
Format: Literatur (SPOLIT)
Publikationstyp: Zeitschriftenartikel
Medienart: Elektronische Ressource (online) Gedruckte Ressource
Sprache:Englisch
ISSN:1062-6050, 0160-8320, 1938-162X
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Erfassungsnummer:PU201012009345
Quelle:BISp

Abstract

Objective: To investigate the reliability and validity of refractometry, hydrometry, and reagent strips in assessing urine specific gravity in collegiate wrestlers.
Design and Setting: We assessed the reliability of refractometry, hydrometry, and reagent strips between 2 trials and among 4 testers. The validity of hydrometry and reagent strips was assessed by comparison with refractometry, the criterion measure for urine specific gravity. Subjects: Twenty-one National Collegiate Athletic Association Division III collegiate wrestlers provided fresh urine samples.
Measurements: Four testers measured the specific gravity of each urine sample 6 times: twice by refractometry, twice by hydrometry, and twice by reagent strips.
Results: Refractometer measurements were consistent between trials (R = .998) and among testers; hydrometer measurements were consistent between trials (R = .987) but not among testers; and reagent-strip measurements were not consistent between trials or among testers. Hydrometer (1.018 ± 0.006) and reagent-strip (1.017 ± 0.007) measurements were significantly higher than refractometer (1.015 ± 0.006) measurements. Intraclass correlation coefficients were moderate between refractometry and hydrometry (R = .869) and low between refractometry and reagent strips (R = .573). The hydrometer produced 28% false positives and 2% false negatives, and reagent strips produced 15% false positives and 9% false negatives.
Conclusions: Only the refractometer should be used to determine urine specific gravity in collegiate wrestlers during the weight-certification process. Verf.-Referat