Urine Specific Gravity as a Practical Marker for Identifying Suboptimal Fluid Intake of Runners ∼12-hr Postexercise.

International Journal of Sport Nutrition and Exercise Metabolism
E K O'NealMary Caitlin Stevenson-Wilcoxson

Abstract

The legitimacy of urine specific gravity (USG) as a stand-alone measure to detect hydration status has recently been challenged. As an alternative to hydration status, the purpose of this study was to determine the diagnostic capability of using the traditional USG marker of >1.020 to detect insufficient recovery fluid consumption with consideration for moderate versus high sweat losses (2.00-2.99 or >3% body mass, respectively). Adequate recovery fluid intake was operationally defined as ≥100% beverage fluid intake plus food water from one or two meals and a snack. Runners (n = 59) provided 132 samples from five previous investigations in which USG was assessed 10-14 hr after 60-90 min runs in temperate-to-hot environments. Samples were collected after a meal (n = 58) and after waking (n = 74). When sweat losses exceeded 3% body mass (n = 60), the relationship between fluid replacement percentage and USG increased from r = -.55 to -.70. Correct diagnostic decision improved from 66.6 to 83.3%, and receiver operating characteristic area under the curve increased the diagnostic accuracy score from 0.76 to approaching excellent (0.86). Artifacts of significant prerun hyperhydration (eight of 15 samples has USG <1.005) may explain ...Continue Reading

References

Jan 1, 1996·Medicine and Science in Sports and Exercise·V A ConvertinoW M Sherman
Apr 27, 2001·Medicine and Science in Sports and Exercise·L A PopowskiC V Gisolf
Jul 2, 2003·Current Sports Medicine Reports·Samuel N CheuvrontMichael N Sawka
Feb 20, 2004·Journal of Sports Sciences·Susan M ShirreffsSamuel N Cheuvront
Jan 28, 2005·International Journal of Sport Nutrition and Exercise Metabolism·Samuel N CheuvrontMichael N Sawka
May 24, 2005·Current Sports Medicine Reports·Douglas J CasaWilliam O Roberts
Jul 9, 2005·Clinical Journal of Sport Medicine : Official Journal of the Canadian Academy of Sport Medicine·Tamara Hew-ButlerUNKNOWN Exercise-Associated Hyponatremia (EAH) Consensus Panel
Sep 1, 2005·International Journal of Sport Nutrition and Exercise Metabolism·Robert A OppligerCarl V Gisolfi
May 5, 2006·Medicine and Science in Sports and Exercise·Christopher ByrneElaine Yu Ming Tan
May 1, 2007·Sports Medicine·Samuel N CheuvrontMichael N Sawka
Aug 19, 2007·International Journal of Sport Nutrition and Exercise Metabolism·Dennis PasseRobert Murray
Oct 27, 2007·Journal of the American College of Nutrition·Lawrence E Armstrong
Apr 11, 2008·British Journal of Sports Medicine·F G BeltramiT D Noakes
May 8, 2008·Medicine and Science in Sports and Exercise·Barry W FudgeYannis P Pitsiladis
Nov 27, 2008·International Journal of Sport Nutrition and Exercise Metabolism·Ronald J Maughan, Susan M Shirreffs
Aug 14, 2009·Journal of Strength and Conditioning Research·Rebecca L StearnsCarl M Maresh
Mar 10, 2010·Journal of Athletic Training·Douglas J CasaCarl M Maresh
Mar 20, 2010·European Journal of Applied Physiology·Jason K W LeeChristopher Byrne
May 19, 2010·International Journal of Sport Nutrition and Exercise Metabolism·Lawrence E ArmstrongCarl M Maresh
Sep 30, 2010·British Journal of Sports Medicine·James M WingerLara R Dugas
Mar 18, 2011·Scandinavian Journal of Medicine & Science in Sports·S A KavourasL S Sidossis
May 21, 2011·Journal of the International Society of Sports Nutrition·Lukas Y BeisYannis P Pitsiladis
Mar 28, 2012·Clinical Journal of Sport Medicine : Official Journal of the Canadian Academy of Sport Medicine·Lukas Y BeisYannis P Pitsiladis
Jan 1, 2011·Journal of Athletic Training·Eric K O'NealPhil A Bishop
Sep 27, 2012·International Journal of Sport Nutrition and Exercise Metabolism·Eric K O'NealJoyce R McIntosh
Jan 25, 2013·The American Journal of Clinical Nutrition·Samuel N CheuvrontMichael N Sawka
Apr 3, 2014·Comprehensive Physiology·Samuel N Cheuvront, Robert W Kenefick
Apr 5, 2014·European Journal of Sport Science·Brett Alan DavisEric Kyle O'Neal
Nov 12, 2014·International Journal of Sport Nutrition and Exercise Metabolism·Samuel N CheuvrontEdward J Zambraski
Oct 7, 2016·International Journal of Sport Nutrition and Exercise Metabolism·Mary Caitlin Stevenson WilcoxsonEric Kyle O'Neal
Jan 28, 2017·Journal of Applied Physiology·Gethin H EvansRonald J Maughan
Oct 7, 2017·Journal of Athletic Training·Brendon P McDermottWilliam O Roberts
Feb 28, 2018·The Journal of Nutrition, Health & Aging·B A YatesL E Armstrong

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