Characteristics of 161-km Ultramarathon Finishers Developing Exercise-Associated Hyponatremia Journal Article

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Authors: Hoffman, M. D.; Fogard, K.; Winger, J.; Hew-Butler, T.; Stuempfle, K. J.
Article Title: Characteristics of 161-km Ultramarathon Finishers Developing Exercise-Associated Hyponatremia
Abstract: This study sought to identify runner characteristics or symptoms that could distinguish those finishers developing exercise-associated hyponatremia (EAH) from those not developing EAH in a 161-km ultramarathon. Of 310 finishers, 207 (67%) underwent postrace blood studies. Twelve (6%) finishers had EAH (blood sodium range 131–134 mmol/L). Experience at 161-km ultramarathons was lower (p = 0.01) and blood creatine kinase (CK) concentration was higher (p = 0.04) among those with EAH than those not developing EAH. Blood sodium and CK concentration were negatively correlated (p = 0.0015, r = -0.22). There were no group differences in age, sex, regular running experience, weekly training distance, use of sodium supplements during training, immediately postrace sodium palatability and thirst ratings, body mass change, urination frequency, nonsteroidal anti-inflammatory drugs (NSAIDs) use, and various symptoms experienced during the race. These findings indicate that a clinical suspicion and measurement of blood sodium concentration remain the only viable means for determining when an ultramarathon runner has EAH.
Journal Title: Research in Sports Medicine
Volume: 21
Issue: 2
ISSN: 1543-8627
Publisher: Unknown  
Date Published: 2013
Start Page: 164
End Page: 175
Language: English
DOI/URL:

http://search.ebscohost.com/login.aspx?direct=true=rzh=2012060835=ehost-live

10.1080/15438627.2012.757230
Notes: ID: 2012060835