European Journal of Applied Physiology

, Volume 115, Issue 5, pp 1067–1074 | Cite as

Markers of the hydration process during fluid volume modification in women with habitual high or low daily fluid intakes

  • Evan C. Johnson
  • Colleen X. Muñoz
  • Laurent Le Bellego
  • Alexis Klein
  • Douglas J. Casa
  • Carl M. Maresh
  • Lawrence E. Armstrong
Original Article

Abstract

Purpose

Human daily total water intake (TWI) has a large inter-individual range. Recently, water supplementation has been suggested as a potential preventative and therapeutic modality. Thus, we aimed to measure hydration biomarkers in women with high (HIGH) versus low (LOW) daily TWI to determine baseline differences, and the efficacy of these markers during a systematic alteration in TWI.

Methods

This cohort study identified 14 HIGH [3.34 (0.56) L day−1] and 14 LOW [1.62 (0.48) L day−1] from 120 women. Next, fluid intake was decreased in HIGH [2.00 (0.21) L day−1] while LOW increased [3.50 (0.13) L day−1] across 4 days. Body mass, fluid intake, serum osmolality (Sosmo), total plasma protein (TPP), 24 h urine osmolality, and 24 h urine volume, were measured on each day of modified TWI. Estimated plasma volume (Epv) was calculated using measured body mass and hematocrit values.

Results

At baseline, urinary markers and TPP differentiated HIGH from LOW [7.0 (0.3) versus 7.3 (0.3) mg dL−1, respectively]. Upon TWI intervention, (1) body mass decreased in HIGH [−0.7 (1.1) kg, p = 0.010)] but did not increase in LOW [+0.0 (0.6) kg, p = 0.110], (2) Epv decreased 2.1 (2.4)  %, p = 0.004, (3) urine osmolality increased in HIGH [397 (144)–605 (230) mOsm kg−1, p < 0.001] and decreased in LOW [726 (248)–265 (97) mOsm kg−1p < 0.001], and (4) no changes of serum osmolality occurred in either HIGH or LOW (all p > 0.05).

Conclusions

Urinary markers and TPP are sensitive measures to habitual high and low TWI and to changes in TWI. Both groups through urinary and some hematological responses following TWI manipulation achieved regulation of hemoconcentration.

Keywords

Hydration indices Fluid intake Osmolality Hydration status Fluid regulation 

Abbreviations

Epv

Estimated plasma volume

Hct

Hematocrit (%)

HIGH

Participant group that habitually consumed 3.34 (0.56) L day−1

LOW

Participant group that habitually consumed 1.62 (0.48) L day−1

Serum Cl

Serum chloride (mmol L−1)

Serum K+

Serum potassium (mmol L−1)

Serum Na+

Serum sodium (mmol L−1)

Sosmo

Serum osmolality (mOsm kg−1)

TPP

Total plasma protein (mg dL−1)

TWI

Total water intake including water from food and beverages

Ucol

Urine color

Uosmo

Urine osmolality (mOsm kg-1)

Usg

Urine specific gravity

Uvol

Volume of urine produced in 24 h urine collection (L)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Evan C. Johnson
    • 1
    • 2
  • Colleen X. Muñoz
    • 1
  • Laurent Le Bellego
    • 3
  • Alexis Klein
    • 3
  • Douglas J. Casa
    • 2
  • Carl M. Maresh
    • 2
    • 4
  • Lawrence E. Armstrong
    • 2
  1. 1.Department of Health, Human Performance, and RecreationUniversity of ArkansasFayettevilleUSA
  2. 2.Department of KinesiologyUniversity of ConnecticutStorrsUSA
  3. 3.Hydration and Health DepartmentDANONE ResearchPalaiseauFrance
  4. 4.Department of Human SciencesOhio State UniversityColumbusUSA

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