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Hydration testing in collegiate wrestlers undergoing hypertonic dehydration.

Cynthia Bartok1, Dale A Schoeller, Jude C Sullivan

  • 1Department of Nutritional Sciences, University of Wisconsin, Madison, WI, USA. cynthia_bartok@yahoo.com

Medicine and Science in Sports and Exercise
|April 13, 2004
PubMed
Summary

Accurate hydration testing is crucial for assessing body composition in athletes. This study establishes specific gravity cutoff values to detect dehydration, aiding in minimal weight assessments.

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Area of Science:

  • Sports Science
  • Physiology
  • Body Composition Analysis

Background:

  • Dehydration (DEH) impacts body composition assessments.
  • Hydration testing is integral to minimal weight (MW) evaluations.

Purpose of the Study:

  • To determine the accuracy of hydration tests for detecting and quantifying hypertonic dehydration.
  • Establish reliable cutoff values for various hydration markers.

Main Methods:

  • Assessed hydration in 25 male collegiate wrestlers under euhydration (EUH) and dehydration (DEH) conditions.
  • DEH induced by 2-6% body weight loss via fluid restriction, food restriction, and exercise in heat.
  • Measured urine and plasma osmolality, potassium, sodium, chloride, arginine vasopressin, urine specific gravity, and bioelectrical impedance spectroscopy.

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Main Results:

  • Most hydration tests significantly increased from EUH to DEH, with established cutoff values.
  • Urine specific gravity cutoff of 1.020 g.mL(-1) showed high sensitivity and specificity.
  • Urine protein detection increased from 5% in EUH to 100% in DEH.

Conclusions:

  • A urine specific gravity cutoff of 1.020 g.mL(-1) effectively identifies hypertonic dehydration.
  • Further research needed to validate cutoff values and explore the DEH-urine protein relationship.