The weight, urine colour and thirst Venn diagram is an accurate tool compared with urinary and blood markers for hydration assessment at morning and afternoon timepoints in euhydrated and free-living individuals

The weight, urine colour and thirst Venn diagram is an accurate tool compared with urinary and blood markers for hydration assessment at morning and afternoon timepoints in euhydrated and free-living individuals

The weight, urine colour and thirst (WUT) Venn diagram is a practical hydration assessment tool; however, it has only been investigated during first-morning. This study investigated accuracy of the WUT Venn diagram at morning and afternoon timepoints compared with blood and urine markers. Twelve men...

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Bibliographic Details
Published in:British journal of nutrition Vol. 131; no. 7; pp. 1181 - 1188
Main Authors: Keefe, Marcos S., Luk, Hui-Ying, Rolloque, Jan-Joseph S., Jiwan, Nigel C., McCollum, Tyler B., Sekiguchi, Yasuki
Format: Journal Article
Language:English
Published: Cambridge, UK Cambridge University Press 14-04-2024
Subjects:
Accuracy
Blood
Body mass
Color
Dehydration
Dehydration - diagnosis
Density
Female
Food
Human and Clinical Nutrition
Humans
Hydration
Laboratories
Male
Military personnel
Osmolar Concentration
Research methodology
Sensitivity analysis
Specific gravity
Thirst
Urinalysis
Urine
Venn diagrams
Weight
United States > US
Dehydration
Field settings
Hydration assessment
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Summary:The weight, urine colour and thirst (WUT) Venn diagram is a practical hydration assessment tool; however, it has only been investigated during first-morning. This study investigated accuracy of the WUT Venn diagram at morning and afternoon timepoints compared with blood and urine markers. Twelve men (21 ± 2 years; 81·0 ± 15·9 kg) and twelve women (22 ± 3 years; 68·8 ± 15·2 kg) completed the study. Body mass, urine colour, urine specific gravity (USG), urine osmolality (UOSM), thirst and plasma osmolality (POSM) were collected at first-morning and afternoon for 3 consecutive days in free-living (FL) and euhydrated states. Number of markers indicating dehydration levels were categorised into either 3, 2, 1 or 0 WUT markers. Receiver operating characteristics analysis calculated the sensitivity and specificity of 1, 2 or 3 hydration markers in detecting dehydration or euhydration. Specificity values across morning and afternoon exhibited high diagnostic accuracy for USG (0·890–1·000), UOSM (0·869–1·000) and POSM (0·787–0·990) when 2 and 3 WUT markers were met. Sensitivity values across both timepoints exhibited high diagnostic accuracy for USG (0·826–0·941) and UOSM (0·826–0·941), but not POSM in the afternoon (0·324) when 0 and 1 WUT markers were met. The WUT Venn diagram is accurate in detecting dehydration for WUT2 and WUT3 based off USG, UOSM and POSM during first-morning and afternoon. Applied medical, sport and occupational practitioners can use this tool in field settings for hydration assessment not only at various timepoints throughout the day but also in FL individuals.
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ISSN:0007-1145
1475-2662
DOI:10.1017/S000711452300274X