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Performance Benefits of Rehydration with Intravenous Fluid and Oral Glycerol.
MedLine Citation:
PMID:  22453248     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
PURPOSE: Intravenous (IV) saline has been used by athletes attempting to accelerate rehydration procedures. The diuresis from IV rehydration may be circumvented through the concomitant use of oral glycerol. We aimed to examine the effects of rehydrating with four different regimes of IV fluid and oral glycerol on subsequent 40 km cycling time trial performance. METHODS: Nine endurance-trained men were dehydrated by 4% bodyweight via exercise in the heat. They then rehydrated with 150% of the fluid lost via four protocols using a randomised, cross-over design; 1) oral = sports drink and water, 2) oral glycerol = sports drink, water and glycerol, 3) IV = half as normal saline, half of sports drink and water, and 4) IV with oral glycerol = half as normal saline, half as sports drink, water and glycerol. Following this they completed a 40 km cycling performance test in the heat. RESULTS: Compared to oral rehydration, there were significant performance benefits (P<0.05) when rehydrating with oral glycerol (improved time to complete 40 km by 3.7%), IV (3.5%) and IV with oral glycerol (4.1%). Plasma volume restoration was highest in IV with oral glycerol, then IV, then oral glycerol, then oral (P<0.01 for all of these comparisons). There were no differences in heart rate, tympanic/skin temperatures, sweat rate, blood lactate concentration, thermal stress or rating of perceived exertion between groups. CONCLUSION: Combining IV fluid with oral glycerol resulted in the greatest fluid retention, however it did not improve exercise performance compared to either modality alone.
Authors:
Simon P van Rosendal; Natalie A Strobel; Mark A Osborne; Robert G Fassett; Jeff S Coombes
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-3-26
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  -     ISSN:  1530-0315     ISO Abbreviation:  -     Publication Date:  2012 Mar 
Date Detail:
Created Date:  2012-3-28     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
1Human Performance Laboratory, School of Human Movement Studies, The University of Queensland, Brisbane, Brisbane, Queensland, Australia. 2Queensland Academy of Sport, Brisbane, Queensland, Australia. 3School of Medicine, The University of Queensland, Brisbane, Queensland, Australia.
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