Document Detail

Elite Kenyan endurance runners are hydrated day-to-day with ad libitum fluid intake.
MedLine Citation:
PMID:  18460986     Owner:  NLM     Status:  MEDLINE    
Previous studies of elite Kenyan endurance runners reported that athletes did not consume liquids before or during training and infrequently consumed modest amounts of liquids after training that contributed to low daily fluid intake. PURPOSE: To assess hydration status of elite Kenyan endurance runners during an important training period. METHODS: Hydration status was monitored in fourteen elite Kenyan endurance runners over a 5-d training period 1 wk prior to the Kenyan national trials for the 2005 IAAF Athletics World Championships by measuring body mass, urine osmolality, total body water, and daily fluid intake. Dietary sodium (Na) intake was estimated using a 5-d nutritional diary and biochemical analysis, whilst [Na] was determined in urine and sweat. Intestinal temperature was monitored continuously during training sessions. RESULTS: Daily fluid intake was consistent with previous observations. There was a significant body mass loss during the morning, interval, and afternoon training sessions (P < 0.05). Nevertheless, mean total body water and pretraining body mass were well maintained day-to-day throughout the 5-d recording period (P = 0.194 and P = 0.302, respectively). Furthermore, there was no significant difference between the osmolality of the morning urine sample and the evening sample (P = 0.685). Mean Na intake was not significantly different to Na loss in sweat and urine (P = 0.975). No athlete showed signs or symptoms of heat strain at any time. CONCLUSIONS: These results demonstrate that elite Kenyan endurance runners remain well hydrated day-to-day with an ad libitum fluid intake; a pattern and volume of fluid intake that is consistent with previous observations of elite Kenyan endurance runners.
Barry W Fudge; Chris Easton; David Kingsmore; Festus K Kiplamai; Vincent O Onywera; Klaas R Westerterp; Bengt Kayser; Timothy D Noakes; Yannis P Pitsiladis
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  40     ISSN:  0195-9131     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  2008 Jun 
Date Detail:
Created Date:  2008-05-22     Completed Date:  2008-10-21     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1171-9     Citation Subset:  IM; S    
International Centre for East African Running Science (ICEARS, University of Glasgow, Glasgow, UK.
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MeSH Terms
Athletic Performance
Drinking / physiology*
Physical Endurance
Running / physiology*
Water-Electrolyte Balance / physiology*

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