title: No Change in 24-Hour Hydration Status Following a Moderate Increase in Fluid Consumption.
abstract: To investigate changes in 24-hour hydration status when increasing fluid intake.
  
  
  
  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 (Sosm), total body water (TBW) via bioelectrical impedance, 24-hour urine osmolality (Uosm), and volume (Uvol) were analyzed at the end of each 24-hour intervention.
  
  
  
  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), Sosm (292 ± 5 vs 292 ± 5 mOsm/kg), 24-hour Uosm (600 ± 224 vs 571 ± 212 mOsm/kg), or 24-hour Uvol (1569 ± 607 vs 1580 ± 554 ml; all p > 0.05).
  
  
  
  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.
authors.affiliation: a Department of Health , Human Performance, and Recreation, University of Arkansas , Fayetteville , Arkansas.
authors.forename: Matthew A
authors.initials: MA
authors.lastname: Tucker
authors.affiliation: a Department of Health , Human Performance, and Recreation, University of Arkansas , Fayetteville , Arkansas.
authors.forename: J D
authors.initials: JD
authors.lastname: Adams
authors.affiliation: a Department of Health , Human Performance, and Recreation, University of Arkansas , Fayetteville , Arkansas.
authors.forename: Lemuel A
authors.initials: LA
authors.lastname: Brown
authors.affiliation: a Department of Health , Human Performance, and Recreation, University of Arkansas , Fayetteville , Arkansas.
authors.forename: Christian B
authors.initials: CB
authors.lastname: Ridings
authors.affiliation: a Department of Health , Human Performance, and Recreation, University of Arkansas , Fayetteville , Arkansas.
authors.forename: Jenna M
authors.initials: JM
authors.lastname: Burchfield
authors.affiliation: a Department of Health , Human Performance, and Recreation, University of Arkansas , Fayetteville , Arkansas.
authors.forename: Forrest B
authors.initials: FB
authors.lastname: Robinson
authors.affiliation: b McDermott Nutrition , Fayetteville , Arkansas.
authors.forename: Jamie L
authors.initials: JL
authors.lastname: McDermott
authors.affiliation: a Department of Health , Human Performance, and Recreation, University of Arkansas , Fayetteville , Arkansas.
authors.forename: Brett A
authors.initials: BA
authors.lastname: Schreiber
authors.affiliation: a Department of Health , Human Performance, and Recreation, University of Arkansas , Fayetteville , Arkansas.
authors.forename: Nicole E
authors.initials: NE
authors.lastname: Moyen
authors.affiliation: a Department of Health , Human Performance, and Recreation, University of Arkansas , Fayetteville , Arkansas.
authors.forename: Tyrone A
authors.initials: TA
authors.lastname: Washington
authors.affiliation: a Department of Health , Human Performance, and Recreation, University of Arkansas , Fayetteville , Arkansas.
authors.forename: Andrea C
authors.initials: AC
authors.lastname: Bermudez
authors.affiliation: a Department of Health , Human Performance, and Recreation, University of Arkansas , Fayetteville , Arkansas.
authors.forename: Meredith P
authors.initials: MP
authors.lastname: Bennett
authors.affiliation: c The Coca-Cola Company , Atlanta , Georgia.
authors.forename: Maxime E
authors.initials: ME
authors.lastname: Buyckx
authors.affiliation: a Department of Health , Human Performance, and Recreation, University of Arkansas , Fayetteville , Arkansas.
authors.forename: Matthew S
authors.initials: MS
authors.lastname: Ganio
mesh_terms: D001628:Beverages; D015992:Body Mass Index; D001834:Body Water; D003681:Dehydration / Q000517:prevention & control*; D004032:Diet; D004326:Drinking; D017097:Electric Impedance; D006801:Humans; D008297:Male; D044967:Serum; D014556:Urine; D059349:Urine Specimen Collection; D014882:Water-Electrolyte Balance; D055815:Young Adult
keywords: body fluid balance; fluid intake guidelines; hydration assessment; hydration status; increased fluid intake