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Blood and urinary measures of hydration status during progressive acute dehydration.
Med Sci Sports Exerc 2001; 33(5):747-53MS

Abstract

PURPOSE

To determine whether: a) plasma osmolarity (Posm) is sensitive to small incremental changes in hydration status, b) urine specific gravity (Usg) can accurately identify a state of euhydration, c) Usg is a sensitive indicator of a change in hydration status, and d) Usg correlates with Posm.

METHODS

Euhydrated (Posm = 288 +/- 4 mOsm.L-1) subjects (N = 12) were dehydrated by 5% of their body weight via exercise in the heat (40 degrees C, 20% RH). Posm, urine osmolarity (Uosm), and Usg were measured at 1%, 3%, and 5% dehydration, and 30 and 60 min of recovery (rec). Subjects consumed water in recovery equal to their loss of body weight.

RESULTS

Posm increased incrementally with each successive increase in percent body weight loss (%BWL). Usg was not significantly different from baseline until 3% BML. Uosm was not significantly different from baseline until 5% BWL. Usg correlated moderately (r = 0.46, P > 0.10) with Posm but reasonably well (r = 0.68, P < 0.02) with Uosm.

CONCLUSIONS

Posm accurately identifies a state of euhydration and is sensitive to changes in hydration status during acute dehydration and rehydration. Usg and Uosm are also sensitive to changes in hydration status but lag behind during periods of rapid body fluid turnover and therefore correlate only moderately with Posm during acute dehydration.

Authors+Show Affiliations

Department of Exercise Science, University of Iowa, Iowa City, IA 52242, USA.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Evaluation Studies
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

11323543

Citation

Popowski, L A., et al. "Blood and Urinary Measures of Hydration Status During Progressive Acute Dehydration." Medicine and Science in Sports and Exercise, vol. 33, no. 5, 2001, pp. 747-53.
Popowski LA, Oppliger RA, Patrick Lambert G, et al. Blood and urinary measures of hydration status during progressive acute dehydration. Med Sci Sports Exerc. 2001;33(5):747-53.
Popowski, L. A., Oppliger, R. A., Patrick Lambert, G., Johnson, R. F., Kim Johnson, A., & Gisolf, C. V. (2001). Blood and urinary measures of hydration status during progressive acute dehydration. Medicine and Science in Sports and Exercise, 33(5), pp. 747-53.
Popowski LA, et al. Blood and Urinary Measures of Hydration Status During Progressive Acute Dehydration. Med Sci Sports Exerc. 2001;33(5):747-53. PubMed PMID: 11323543.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Blood and urinary measures of hydration status during progressive acute dehydration. AU - Popowski,L A, AU - Oppliger,R A, AU - Patrick Lambert,G, AU - Johnson,R F, AU - Kim Johnson,A, AU - Gisolf,C V, PY - 2001/4/27/pubmed PY - 2001/6/22/medline PY - 2001/4/27/entrez KW - Non-programmatic SP - 747 EP - 53 JF - Medicine and science in sports and exercise JO - Med Sci Sports Exerc VL - 33 IS - 5 N2 - PURPOSE: To determine whether: a) plasma osmolarity (Posm) is sensitive to small incremental changes in hydration status, b) urine specific gravity (Usg) can accurately identify a state of euhydration, c) Usg is a sensitive indicator of a change in hydration status, and d) Usg correlates with Posm. METHODS: Euhydrated (Posm = 288 +/- 4 mOsm.L-1) subjects (N = 12) were dehydrated by 5% of their body weight via exercise in the heat (40 degrees C, 20% RH). Posm, urine osmolarity (Uosm), and Usg were measured at 1%, 3%, and 5% dehydration, and 30 and 60 min of recovery (rec). Subjects consumed water in recovery equal to their loss of body weight. RESULTS: Posm increased incrementally with each successive increase in percent body weight loss (%BWL). Usg was not significantly different from baseline until 3% BML. Uosm was not significantly different from baseline until 5% BWL. Usg correlated moderately (r = 0.46, P > 0.10) with Posm but reasonably well (r = 0.68, P < 0.02) with Uosm. CONCLUSIONS: Posm accurately identifies a state of euhydration and is sensitive to changes in hydration status during acute dehydration and rehydration. Usg and Uosm are also sensitive to changes in hydration status but lag behind during periods of rapid body fluid turnover and therefore correlate only moderately with Posm during acute dehydration. SN - 0195-9131 UR - https://www.unboundmedicine.com/medline/citation/11323543/Blood_and_urinary_measures_of_hydration_status_during_progressive_acute_dehydration_ L2 - http://Insights.ovid.com/pubmed?pmid=11323543 DB - PRIME DP - Unbound Medicine ER -