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Hyponatremia in the 2009 161-km Western States Endurance Run.
MedLine Citation:
PMID:  21941013     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
PURPOSE: To determine the incidence of exercise-associated hyponatremia (EAH), the associated biochemical measurements and risk factors for EAH, and whether there is an association between post-race blood sodium concentration ([Na+]) and changes in body mass among participants in the 2009 Western States Endurance Run, a 161-km mountain trail run. METHODS: Change in body mass, post-race [Na+] and blood creatinine phosphokinase (CPK) concentration, and selected runner characteristics were evaluated among consenting competitors. RESULTS: Of the 47 study participants, 14 (30%) had EAH as defined by a post-race [Na+] <135 mmol/L. Post-race [Na+] and percent change in body mass were directly related (r=0.30, p=0.044), and 50% of those with EAH had body mass losses of 3-6%. EAH was unrelated to age, sex, finish time, or use of non-steroidal anti-inflammatory drugs during the run, but those with EAH had completed a smaller (p=0.03) number of 161-km ultramarathons. The relationship of CPK levels to post-race [Na+] did not reach statistical significance (r=-0.25, p=0.097). CONCLUSIONS: EAH was common (30%) among finishers of this 161-km ultramarathon and it was not unusual for those with EAH to be dehydrated. As such, changes in body mass should not be relied upon in the assessment for EAH during 161-km ultramarathons.
Authors:
Martin D Hoffman; Kristin J Stuempfle; Ian R Rogers; Louise B Weschler; Tamara Hew-Butler
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-8-30
Journal Detail:
Title:  International journal of sports physiology and performance     Volume:  -     ISSN:  1555-0265     ISO Abbreviation:  -     Publication Date:  2011 Aug 
Date Detail:
Created Date:  2011-9-23     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101276430     Medline TA:  Int J Sports Physiol Perform     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Department of Physical Medicine & Rehabilitation, Department of Veterans Affairs, Northern California Health Care System, and University of California Davis Medical Center, Sacramento, CA.
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