Hydration assessment among marathoners using urine specific gravity and bioelectrical impedance analysis

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Bibliographic Details
Title translated into German:Die Beurteilung der Hydratation von Marathonläufern anhand urinspezifischer Schwerkraft und bioelektrischer Impedanzanalyse
Author:Cutrufello, Paul T.; Dixon, Curt B.; Zavorsky, Gerald S.
Published in:Research in sports medicine
Published:24 (2016), 3, S. 219-227, Lit.
Format: Publications (Database SPOLIT)
Publication Type: Journal article
Media type: Electronic resource (online) Print resource
ISSN:1543-8627, 1543-8635
Online Access:
Identification number:PU201803001783

Author's abstract

The present study examined the relationship between urine specific gravity (Usg), body mass (BM) and bioelectrical impedance determined variables [total body water (TBW), per cent TBW and impedance values] before and after a marathon (n = 25 men; 10 women). A significant reduction in BM (pre: 71.2 ± 12.4 kg; post: 69.6 ± 12.0 kg; p < 0.001) and an increase in Usg (pre: 1.009 ± 0.007; post: 1.018 ± 0.009; p < 0.001) was observed post-race. TBW was not significantly decreased (pre: 42.7 ± 8.0 kg; post: 42.4 ± 7.7 kg) while per cent TBW significantly increased post-race (pre: 60.0 ± 3.9%; post: 60.8 ± 3.8%; p < 0.001). Impedance values were significantly greater post-race (pre: 3288 ± 482; post: 3416 ± 492 Ω; p < 0.001). There was no correlation between the change in Usg and the change in BM or any of the bioelectrical impedance determined variables. On average, BM, Usg and impedance values appear to express changes in hydration; however, the observed changes among these variables for a given individual appear to be inconsistent with one another.