Tags

Type your tag names separated by a space and hit enter

Accuracy of urine specific gravity and osmolality as indicators of hydration status.

Abstract

To reduce the adverse consequences of exertion-related and acute intentional dehydration research has focused on monitoring hydration status. This investigation: 1) compared sensitivity of urine specific gravity (Usg), urine osmolality (U(osm)) and a criterion measurement of hydration, plasma osmolality (P(osm)), at progressive stages of acute hypertonic dehydration and 2) using a medical decision model, determined whether Usg or U(osm) accurately reflected hydration status compared to P(osm) among 51 subjects tested throughout the day. Incremental changes in P(osm) were observed as subjects dehydrated by 5% of body weight and rehydrated while Usg and U(osm) showed delayed dehydration-related changes. Using the medical decision model, sensitivity and specificity were not significant at selected cut-offs for Usg and U(osm). At the most accurate cut-off values, 1.015 and 1.020 for Usg and 700 m(osm)/kg and 800 m(osm)/kg for U(osm), only 65% of the athletes were correctly classified using Usg and 63% using U(osm). P(osm), Usg, and U(osm) appear sensitive to incremental changes in acute hypertonic dehydration, however, the misclassified outcomes for Usg and U(osm) raise concerns. Research focused on elucidating the factors affecting accurate assessment of hydration status appears warranted.

Links

Authors+Show Affiliations

,

Iowa Wrestling Research, Iowa City, IA 52240, USA.

, ,

Source

MeSH

Adult
Analysis of Variance
Biomarkers
Dehydration
Exercise
Humans
Male
Osmolar Concentration
Reference Values
Sensitivity and Specificity
Specific Gravity
Urine
Water-Electrolyte Balance

Pub Type(s)

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

Language

eng

PubMed ID

16131695

Citation

Oppliger, Robert A., et al. "Accuracy of Urine Specific Gravity and Osmolality as Indicators of Hydration Status." International Journal of Sport Nutrition and Exercise Metabolism, vol. 15, no. 3, 2005, pp. 236-51.
Oppliger RA, Magnes SA, Popowski LA, et al. Accuracy of urine specific gravity and osmolality as indicators of hydration status. Int J Sport Nutr Exerc Metab. 2005;15(3):236-51.
Oppliger, R. A., Magnes, S. A., Popowski, L. A., & Gisolfi, C. V. (2005). Accuracy of urine specific gravity and osmolality as indicators of hydration status. International Journal of Sport Nutrition and Exercise Metabolism, 15(3), pp. 236-51.
Oppliger RA, et al. Accuracy of Urine Specific Gravity and Osmolality as Indicators of Hydration Status. Int J Sport Nutr Exerc Metab. 2005;15(3):236-51. PubMed PMID: 16131695.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Accuracy of urine specific gravity and osmolality as indicators of hydration status. AU - Oppliger,Robert A, AU - Magnes,Scott A, AU - Popowski,LeRoy A, AU - Gisolfi,Carl V, PY - 2005/9/1/pubmed PY - 2005/10/4/medline PY - 2005/9/1/entrez SP - 236 EP - 51 JF - International journal of sport nutrition and exercise metabolism JO - Int J Sport Nutr Exerc Metab VL - 15 IS - 3 N2 - To reduce the adverse consequences of exertion-related and acute intentional dehydration research has focused on monitoring hydration status. This investigation: 1) compared sensitivity of urine specific gravity (Usg), urine osmolality (U(osm)) and a criterion measurement of hydration, plasma osmolality (P(osm)), at progressive stages of acute hypertonic dehydration and 2) using a medical decision model, determined whether Usg or U(osm) accurately reflected hydration status compared to P(osm) among 51 subjects tested throughout the day. Incremental changes in P(osm) were observed as subjects dehydrated by 5% of body weight and rehydrated while Usg and U(osm) showed delayed dehydration-related changes. Using the medical decision model, sensitivity and specificity were not significant at selected cut-offs for Usg and U(osm). At the most accurate cut-off values, 1.015 and 1.020 for Usg and 700 m(osm)/kg and 800 m(osm)/kg for U(osm), only 65% of the athletes were correctly classified using Usg and 63% using U(osm). P(osm), Usg, and U(osm) appear sensitive to incremental changes in acute hypertonic dehydration, however, the misclassified outcomes for Usg and U(osm) raise concerns. Research focused on elucidating the factors affecting accurate assessment of hydration status appears warranted. SN - 1526-484X UR - https://www.unboundmedicine.com/medline/citation/16131695/Accuracy_of_urine_specific_gravity_and_osmolality_as_indicators_of_hydration_status_ L2 - https://medlineplus.gov/dehydration.html DB - PRIME DP - Unbound Medicine ER -