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Hydration Marker Diagnostic Accuracy to Identify Mild Intracellular and Extracellular Dehydration.
- Source :
- International Journal of Sport Nutrition & Exercise Metabolism; Nov2019, Vol. 29 Issue 6, p604-611, 8p, 1 Illustration, 4 Charts
- Publication Year :
- 2019
-
Abstract
- Identifying mild dehydration (≤2% of body mass) is important to prevent the negative effects of more severe dehydration on human health and performance. It is unknown whether a single hydration marker can identify both mild intracellular dehydration (ID) and extracellular dehydration (ED) with adequate diagnostic accuracy (≥0.7 receiver-operating characteristic--area under the curve [ROC-AUC]). Thus, in 15 young healthy men, the authors determined the diagnostic accuracy of 15 hydration markers after three randomized 48-hr trials; euhydration (water 36 ml·kg-1·day<superscript>-1</superscript>), ID caused by exercise and 48 hr of fluid restriction (water 2 ml·kg-1·day<superscript>-1</superscript>), and ED caused by a 4-hr diuretic-induced diuresis begun at 44 hr (Furosemide 0.65 mg/kg). Body mass was maintained on euhydration, and dehydration was mild on ID and ED (1.9% [0.5%] and 2.0% [0.3%] of body mass, respectively). Urine color, urine specific gravity, plasma osmolality, saliva flow rate, saliva osmolality, heart rate variability, and dry mouth identified ID (ROC-AUC; range 0.70--0.99), and postural heart rate change identified ED (ROC-AUC 0.82). Thirst 0--9 scale (ROC-AUC 0.97 and 0.78 for ID and ED) and urine osmolality (ROC-AUC 0.99 and 0.81 for ID and ED) identified both dehydration types. However, only the thirst 0--9 scale had a common dehydration threshold (≥4; sensitivity and specificity of 100%; 87% and 71%, 87% for ID and ED). In conclusion, using a common dehydration threshold ≥4, the thirst 0--9 scale identified mild intracellular and ED with adequate diagnostic accuracy. In young healthy adults', thirst 0--9 scale is a valid and practical dehydration screening tool. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 1526484X
- Volume :
- 29
- Issue :
- 6
- Database :
- Complementary Index
- Journal :
- International Journal of Sport Nutrition & Exercise Metabolism
- Publication Type :
- Academic Journal
- Accession number :
- 140052862
- Full Text :
- https://doi.org/10.1123/ijsnem.2019-0022