Journal article
A randomized trial to assess beverage hydration index in healthy older adults
The American journal of clinical nutrition, Vol.109(6), pp.1640-1647
06/01/2019
DOI: 10.1093/ajcn/nqz009
PMCID: PMC6537935
PMID: 31051498
Abstract
Background: The beverage hydration index (BHI) is a composite measure of fluid balance after consuming a test beverage relative to water. BHI is a relatively new measure that has been explored in young, but not yet older, adults.
Objective: The aim of this study was to investigate potential differences in BHI between euhydrated younger and older adults after drinking 4 different commercial beverages. We hypothesized that 1) older subjects would remain in positive fluid balance longer than young subjects after ingestion of each test beverage due to decreased urinary excretion rates, 2) glucose (glu)- and amino acid (AA)-based hydration beverages with sodium would have a BHI greater than water in both groups, and 3) the traditional 2-h postingestion BHI may be inappropriate for older adults.
Methods: On 5 separate visits, 12 young (23 +/- 3 yr, 7M/5F) and 12 older (67 +/- 6 yr, 5 M/7F) subjects consumed 1 L of distilled water, G-20 (6% CHO, 20 mmol/L Na+), G-45 (2.5% CHO, 45 mmol/L Na+), AA-30 (5 AAs, 30 mmol/L Na+), or AA-60 (8 AAs, 60 mmol/L Na+) over 30 min. Blood and urine samples were collected before ingestion and at 0, 60, 120, 180, and 240 min postingestion with additional venous blood sampling at 5, 10, 15, and 30 min postingestion.
Results: In young subjects, BHI increased with increasing beverage Na+ concentration, and AA-60 had the highest BHI (AA-60 = 1.24 +/- 0.10 compared with water = 1.00, P = 0.01). For older subjects, BHI was highest in AA-30 (AA-30; 1.20 +/- 0.13 compared with water, P < 0.01) and was still in flux beyond 2 h in AA-60 (P < 0.05).
Conclusions: Beverage Na+ content progressively increased BHI in young adults independent of glucose or AA content. For older adults, the AA-30 beverage had the highest BHI. A 4-h BHI may be more appropriate for older adults due to attenuated urine excretion rates. This trial was registered at clinicaltrials.gov as NCT03559101.
Details
- Title: Subtitle
- A randomized trial to assess beverage hydration index in healthy older adults
- Creators
- Megan M. Clarke - Pennsylvania State UniversityAnna E. Stanhewicz - Pennsylvania State UniversityS. Tony Wolf - Pennsylvania State UniversitySamuel N. Cheuvront - United States Department of the ArmyRobert W. Kenefick - United States Department of the ArmyW. Larry Kenney - Pennsylvania State University
- Resource Type
- Journal article
- Publication Details
- The American journal of clinical nutrition, Vol.109(6), pp.1640-1647
- Publisher
- Oxford Univ Press
- DOI
- 10.1093/ajcn/nqz009
- PMID
- 31051498
- PMCID
- PMC6537935
- ISSN
- 0002-9165
- eISSN
- 1938-3207
- Number of pages
- 8
- Grant note
- 5T32AG049676-03 / NIH T-32 Grant; United States Department of Health & Human Services; National Institutes of Health (NIH) - USA T32AG049676 / NATIONAL INSTITUTE ON AGING; United States Department of Health & Human Services; National Institutes of Health (NIH) - USA; NIH National Institute on Aging (NIA)
- Language
- English
- Date published
- 06/01/2019
- Academic Unit
- Fraternal Order of Eagles Diabetes Research Center; Health and Human Physiology; Internal Medicine
- Record Identifier
- 9984259641002771
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