No Change in 24-Hour Hydration Status Following a Moderate Increase in Fluid Consumption. (18th May 2016)

• Record Type: Journal Article
• Authors: Tucker, Matthew A.; Adams, J. D.; Brown, Lemuel A.; Ridings, Christian B.; Burchfield, Jenna M.; Robinson, Forrest B.; McDermott, Jamie L.; Schreiber, Brett A.; Moyen, Nicole E.; Washington, Tyrone A.; Bermudez, Andrea C.; Bennett, Meredith P.; Buyckx, Maxime E.; Ganio, Matthew S.
• Is Part Of: Journal of the American College of Nutrition. Volume 35:Number 4(2016)
• Page Start: 308
• Page End: 316
• Publication Date: 2016-05-18
• Subjects: body fluid balance -- increased fluid intake -- hydration status -- hydration assessment -- fluid intake guidelines; Nutrition -- Periodicals; Nutrition disorders -- Periodicals; 613.2
• DOI: 10.1080/07315724.2015.1046196
• Languages: English
• ISSNs: 0731-5724

Abstract

Abstract : Purpose: To investigate changes in 24-hour hydration status when increasing fluid intake. Methods: Thirty-five healthy males (age 23.8 ± 4.7 years; mass 74.0 ± 9.4 kg) were divided into 4 treatment groups for 2 weeks of testing. Volumes of 24-hour fluid ingestion (including water from food) for weeks 1 and 2 was 35 and 40 ml/kg body mass, respectively. Each treatment group was given the same proportion of beverages in each week of testing: water only ( n = 10), water + caloric cola ( n = 7), water + noncaloric cola ( n = 10), or water + caloric cola + noncaloric cola + orange juice ( n = 8). Serum osmolality ( S osm ), total body water (TBW) via bioelectrical impedance, 24-hour urine osmolality ( U osm ), and volume ( U vol ) were analyzed at the end of each 24-hour intervention. Results: Independent of treatment, total beverage consumption increased 22% from week 1 to 2 (1685 ± 320 to 2054 ± 363 ml; p < 0.001). Independent of beverage assignment, the increase in fluid consumption between weeks 1 and 2 did not change TBW (43.4 ± 5.2 vs 43.0 ± 4.8 kg), S osm (292 ± 5 vs 292 ± 5 mOsm/kg), 24-hour U osm (600 ± 224 vs 571 ± 212 mOsm/kg), or 24-hour U vol (1569 ± 607 vs 1580 ± 554 ml; all p > 0.05). Conclusions: Regardless of fluid volume or beverage type consumed, measures of 24-hour hydration status did not differ, suggesting that standard measures of hydration status are not sensitive enough to detect a 22% increase in beverage consumption.