Document Detail

Dehydration rates and rehydration efficacy of water and sports drink during one hour of moderate intensity exercise in well-trained flatwater kayakers.
MedLine Citation:
PMID:  18461208     Owner:  NLM     Status:  MEDLINE    
INTRODUCTION: The aim of this study is to investigate the amount of water loss and percentage dehydration experienced during 1 hour of paddling on the kayak ergometer so as to help coaches and athletes tailor a suitable and adequate rehydration regime. Also, rehydration efficacy between water and a well established, commercially available sports drink (Gatorade, Quaker Oats company, USA) was investigated in this cross-over study.
MATERIALS AND METHODS: Ten national flatwater kayakers were monitored in a controlled setting while paddling the kayak ergometer for 1 hour at an intensity sustainable for long distance marathon. They rehydrated themselves ad libitum with provided beverage. Post-void towel-dried body mass was measured before and after the exercise with percentage dehydration calculated. Body core temperature (tympanic temperatures), ratings of perceived exertion and thirst index were monitored every 15 minutes. The amount of fluid consumed, urine output and urine specific gravity were obtained after exercise.
RESULTS: The results [mean +/- standard deviation (SD)] showed that kayakers underwent 1.10 +/- 0.52% dehydration while rehydrating with water as compared to 0.72 +/- 0.38% while rehydrating with Gatorade. Also, athletes on water rehydration had higher rating of perceived exertion (RPE) at the 30th and 60th minute mark of the exercise. Overall, athletes undergoing water rehydration lost significantly more body mass (0.70 +/- 0.39 kg) as compared to rehydrating with Gatorade (0.46 +/- 0.27).
CONCLUSION: Although the hydration efficacy of Gatorade proved superior to that of water, the athletes' hydration habits with either fluids did not provide adequate hydration. It is recommended that specific strategies be developed to address dehydration and rehydration issues of kayakers in Singapore.
Jeremy M F Sun; Jason K K Chia; Abdul Rashid Aziz; Benedict Tan
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Publication Detail:
Type:  Clinical Trial; Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Annals of the Academy of Medicine, Singapore     Volume:  37     ISSN:  0304-4602     ISO Abbreviation:  Ann. Acad. Med. Singap.     Publication Date:  2008 Apr 
Date Detail:
Created Date:  2008-05-07     Completed Date:  2008-12-09     Revised Date:  2014-07-30    
Medline Journal Info:
Nlm Unique ID:  7503289     Medline TA:  Ann Acad Med Singapore     Country:  Singapore    
Other Details:
Languages:  eng     Pagination:  261-5     Citation Subset:  IM    
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MeSH Terms
Competitive Behavior
Cross-Over Studies
Dehydration / metabolism*,  physiopathology
Exercise / physiology*
Fluid Therapy / methods*
Monitoring, Physiologic
Physical Exertion / physiology*
Water-Electrolyte Balance / physiology*
Comment In:
Ann Acad Med Singapore. 2008 Nov;37(11):986-7   [PMID:  19082212 ]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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