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Cited by 11

The DOI matches its Crossref record; 3 of the 3 references it cites were found in a registry or an index.

Reliability of Urinary Dehydration Markers in Elite Youth Boxers

Zubac, Damir, Cular, Drazen, Marusic, Uros·2018·International Journal of Sports Physiology and Performance
DOI 10.1123/ijspp.2016-0621
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Abstract

Purpose: To determine the reliability and diagnostic accuracy of noninvasive urinary dehydration markers in field-based settings on a day-to-day basis in elite adolescent amateur boxers. Methods: Sixty-nine urine samples were collected daily from 23 athletes (17.3 ± 1.9 y) during their weight-stable phase and analyzed by field and laboratory measures of hydration status. Urine osmolality (U OSM), urine specific gravity (U SG), total protein content (T PC), and body-mass stability were evaluated to determine fluid balance and hydration status. Overall macronutrient and water intake were determined using dietary records. According to their anthropometric characteristics, athletes were assigned into 2 groups: lightweight (L WB) and heavyweight (H WB) boxers. Results: Data presented on U OSM demonstrated a uniform increment by 11.2% ± 12.8% (L WB) and 19.9% ± 22.7% (H WB) (P < .001) over the course of the study, even during the weight-stable phase (body mass, ICC = .99) and ad libitum fluid intake (42 ± 4 mL · kg−1 · d−1). The intraclass correlation coefficients (ICCs) ranged from .52 to .55 for U SG and .38 to .52 for U OSM, further indicating inconsistency of the urinary dehydration markers. Poor correlations were found between U SG and T PC metabolites (r = .27, P = .211). Conclusions: Urinary dehydration markers (both U SG and U OSM) exhibit high variability and seem to be unreliable diagnostic tools to track actual body-weight loss in real-life settings. The ad libitum fluid intake was apparently inadequate to match acute fluid loss during and after intense preparation. The applicability of a single-time-point hydration-status assessment concept may preclude accurate assessment of actual body-weight deficits in youth boxers.

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Research works printed but not linked: 69

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Cited by

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Metadata

Authors
Zubac, D., Cular, D., & Marusic, U.
Venue
International Journal of Sports Physiology and Performance
Publisher
Human Kinetics
Published
2018-03-01
Volume
13
Issue
3
Pages
374-381
ISSN
  • 1555-0265
  • 1555-0273
DOI
10.1123/ijspp.2016-0621
Cited by
11
References
3

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Zubac, D., Cular, D., & Marusic, U. (2018). Reliability of Urinary Dehydration Markers in Elite Youth Boxers. International Journal of Sports Physiology and Performance. https://doi.org/10.1123/ijspp.2016-0621

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