| Carbohydrate exerts a mild influence on fluid retention following exercise-induced dehydration. | |
| | |
MedLine Citation:
|
PMID: 19940093 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
Rapid and complete rehydration, or restoration of fluid spaces, is important when acute illness or excessive sweating has compromised hydration status. Many studies have investigated the effects of graded concentrations of sodium and other electrolytes in rehydration solutions; however, no study to date has determined the effect of carbohydrate on fluid retention when electrolyte concentrations are held constant. The purpose of this study was to determine the effect of graded levels of carbohydrate on fluid retention following exercise-induced dehydration. Fifteen heat-acclimatized men exercised in the heat for 90 min with no fluid to induce 2-3% dehydration. After a 30-min equilibration period, they received, over the course of 60 min, one of five test beverages equal to 100% of the acute change in body mass. The experimental beverages consisted of a flavored placebo with no electrolytes (P), placebo with electrolytes (P + E), 3%, 6%, and 12% carbohydrate solutions with electrolytes. All beverages contained the same type and concentration of electrolytes (18 meq/l Na(+), 3 meq/l K(+), 11 meq/l Cl(-)). Subjects voided their bladders at 60, 90, 120, 180, and 240 min, and urine specific gravity and urine volume were measured. Blood samples were taken before exercise and 30, 90, 180, and 240 min following exercise and were analyzed for glucose, sodium, hemoglobin, hematocrit, renin, aldosterone, and osmolality. Body mass was measured before and after exercise and a final body mass was taken at 240 min. There were no differences in percent dehydration, sweat loss, or fluid intake between trials. Fluid retention was significantly greater for all carbohydrate beverages compared with P (66.3 +/- 14.4%). P + E (71.8 +/- 9.9%) was not different from water, 3% (75.4 +/- 7.8%) or 6% (75.4 +/- 16.4%) but was significantly less than 12% (82.4 +/- 9.2%) retention of the ingested fluid. No difference was found between the carbohydrate beverages. Carbohydrate at the levels measured exerts a mild influence on fluid retention in postexercise recovery. |
| | |
Authors:
|
Kristin L Osterberg; Shannon E Pallardy; Richard J Johnson; Craig A Horswill |
Related Documents
:
|
11191783 - Impact of fluid replacement on heat storage while wearing protective clothing. 8375613 - Specialized brain cooling in humans? 18562773 - Carbohydrate supplementation and immune responses after acute exhaustive resistance exe... |
Publication Detail:
|
Type: Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't Date: 2009-11-25 |
Journal Detail:
|
Title: Journal of applied physiology (Bethesda, Md. : 1985) Volume: 108 ISSN: 1522-1601 ISO Abbreviation: J. Appl. Physiol. Publication Date: 2010 Feb |
Date Detail:
|
Created Date: 2010-02-01 Completed Date: 2010-04-23 Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 8502536 Medline TA: J Appl Physiol Country: United States |
Other Details:
|
Languages: eng Pagination: 245-50 Citation Subset: IM |
Affiliation:
|
Gatorade Sports Science Institute, Barrington, IL 60010, USA. kroster@vt.edu |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Acclimatization Adult Beverages Blood Glucose / metabolism Body Fluids / drug effects, metabolism* Dehydration / physiopathology, prevention & control*, urine Diet Dietary Carbohydrates / pharmacology* Double-Blind Method Electrolytes / chemistry Exercise / physiology* Hot Temperature Humans Insulin / blood Male Middle Aged Renin / blood Sucrose / pharmacology Urodynamics / drug effects Water / chemistry Young Adult |
| Chemical | |
Reg. No./Substance:
|
0/Blood Glucose; 0/Dietary Carbohydrates; 0/Electrolytes; 11061-68-0/Insulin; 57-50-1/Sucrose; 7732-18-5/Water; EC 3.4.23.15/Renin |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Age-Specific Factors Influencing Asthma Management by Older Adults.
Next Document: Diagrammatic analysis of the respiratory action of the diaphragm.