Document Detail

Weight changes, medical complications, and performance during an Ironman triathlon.
MedLine Citation:
PMID:  15562165     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Subjects exercising without fluid ingestion in desert heat terminated exercise when the total loss in body weight exceeded 7%. It is not known if athletes competing in cooler conditions with free access to fluid terminate exercise at similar levels of weight loss. OBJECTIVES: To determine any associations between percentage weight losses during a 224 km Ironman triathlon, serum sodium concentrations and rectal temperatures after the race, and prevalence of medical diagnoses. METHODS: Athletes competing in the 2000 and 2001 South African Ironman triathlon were weighed on the day of registration and again immediately before and immediately after the race. Blood pressure and serum sodium concentrations were measured at registration and immediately after the race. Rectal temperatures were also measured after the race, at which time all athletes were medically examined. Athletes were assigned to one of three groups according to percentage weight loss during the race. RESULTS: Body weight was significantly (p<0.0001) reduced after the race in all three groups. Serum sodium concentrations were significantly (p<0.001) higher in athletes with the greatest percentage weight loss. Rectal temperatures were the same in all groups, with only a weak inverse association between temperature and percentage weight loss. There were no significant differences in diagnostic indices of high weight loss or incidence of medical diagnoses between groups. CONCLUSIONS: Large changes in body weight during a triathlon were not associated with a greater prevalence of medical complications or higher rectal temperatures but were associated with higher serum sodium concentrations.
K A Sharwood; M Collins; J H Goedecke; G Wilson; T D Noakes
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  British journal of sports medicine     Volume:  38     ISSN:  1473-0480     ISO Abbreviation:  Br J Sports Med     Publication Date:  2004 Dec 
Date Detail:
Created Date:  2004-11-24     Completed Date:  2005-02-09     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  0432520     Medline TA:  Br J Sports Med     Country:  England    
Other Details:
Languages:  eng     Pagination:  718-24     Citation Subset:  IM    
UCT/MRC Research Unit for Exercise Science and Sports Medicine, P O Box 115, Newlands 7725, Cape Town, South Africa.
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MeSH Terms
Blood Pressure / physiology
Body Temperature Regulation / physiology
Cross-Sectional Studies
Dehydration / etiology,  physiopathology
Physical Endurance / physiology*
Rectum / physiology
Risk Factors
Sodium / blood
Sports / physiology*
Weight Loss / physiology*
Reg. No./Substance:

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

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