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Urinary indices during dehydration, exercise, and rehydration.
Int J Sport Nutr 1998; 8(4):345-55IJ

Abstract

This investigation evaluated the validity and sensitivity of urine color (Ucol), specific gravity (Usg), and osmolality (Uosm) as indices of hydration status, by comparing them to changes in body water. Nine highly trained males underwent a 42-hr protocol involving dehydration to 3.7% of body mass (Day 1, -2.64 kg), cycling to exhaustion (Day 2, -5.2% of body mass, -3.68 kg), and oral rehydration for 21 hr. The ranges of mean (across time) blood and urine values were Ucol, 1-7; Usg, 1.004-1.029; Uosm, 117-1,081 mOsm x kg-1; and plasma osmolality (Posm), 280-298 mOsm x kg-1. Urine color tracked changes in body water as effectively as (or better than) Uosm, Usg, urine volume, Posm, plasma sodium, and plasma total protein. We concluded that (a) Ucol, Uosm, and Usg are valid indices of hydration status, and (b) marked dehydration, exercise, and rehydration had little effect on the validity and sensitivity of these indices.

Authors+Show Affiliations

Human Performance Laboratory and Department of Physiology & Neurobiology, University of Connecticut, Storrs, CT 06269-1110, USA.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Clinical Trial
Comparative Study
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

9841955

Citation

Armstrong, L E., et al. "Urinary Indices During Dehydration, Exercise, and Rehydration." International Journal of Sport Nutrition, vol. 8, no. 4, 1998, pp. 345-55.
Armstrong LE, Soto JA, Hacker FT, et al. Urinary indices during dehydration, exercise, and rehydration. Int J Sport Nutr. 1998;8(4):345-55.
Armstrong, L. E., Soto, J. A., Hacker, F. T., Casa, D. J., Kavouras, S. A., & Maresh, C. M. (1998). Urinary indices during dehydration, exercise, and rehydration. International Journal of Sport Nutrition, 8(4), pp. 345-55.
Armstrong LE, et al. Urinary Indices During Dehydration, Exercise, and Rehydration. Int J Sport Nutr. 1998;8(4):345-55. PubMed PMID: 9841955.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Urinary indices during dehydration, exercise, and rehydration. AU - Armstrong,L E, AU - Soto,J A, AU - Hacker,F T,Jr AU - Casa,D J, AU - Kavouras,S A, AU - Maresh,C M, PY - 1998/12/8/pubmed PY - 1998/12/8/medline PY - 1998/12/8/entrez SP - 345 EP - 55 JF - International journal of sport nutrition JO - Int J Sport Nutr VL - 8 IS - 4 N2 - This investigation evaluated the validity and sensitivity of urine color (Ucol), specific gravity (Usg), and osmolality (Uosm) as indices of hydration status, by comparing them to changes in body water. Nine highly trained males underwent a 42-hr protocol involving dehydration to 3.7% of body mass (Day 1, -2.64 kg), cycling to exhaustion (Day 2, -5.2% of body mass, -3.68 kg), and oral rehydration for 21 hr. The ranges of mean (across time) blood and urine values were Ucol, 1-7; Usg, 1.004-1.029; Uosm, 117-1,081 mOsm x kg-1; and plasma osmolality (Posm), 280-298 mOsm x kg-1. Urine color tracked changes in body water as effectively as (or better than) Uosm, Usg, urine volume, Posm, plasma sodium, and plasma total protein. We concluded that (a) Ucol, Uosm, and Usg are valid indices of hydration status, and (b) marked dehydration, exercise, and rehydration had little effect on the validity and sensitivity of these indices. SN - 1050-1606 UR - https://www.unboundmedicine.com/medline/citation/9841955/Urinary_indices_during_dehydration_exercise_and_rehydration_ L2 - https://medlineplus.gov/dehydration.html DB - PRIME DP - Unbound Medicine ER -