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Hyponatremia

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* In a 1997 Ironman triathlon, almost 4% of competitors received attention for Hyponatremia <ref name="ref4"/>.

* In a study of the 2002 Boston Marathon, 13% of finishers had some level of Hyponatremia, and 0.6% had critical Hyponatremia <ref name="ref2"/>.

* In the Houston marathon<ref name="Houston">, 21 runners who received medical help were suffering from Hyponatremia. Runners with Hyponatremia were generally slower and drank more.

==Risk Factors==

The study<ref name="ref12"/> revealed that the risk factors for Hyponatremia in marathons include

<ref name="ref2">Hyponatremia among Runners in the Boston Marathon

[http://content.nejm.org/cgi/content/abstract/352/15/1550 http://content.nejm.org/cgi/content/abstract/352/15/1550]

</ref>

<ref name="ref3">Water Intoxication

[http://en.wikipedia.org/wiki/Water_intoxication http://en.wikipedia.org/wiki/Water_intoxication]

</ref>

<ref name="ref12">BAA - HYDRATION, DEHYDRATION AND HYPONATREMIA

[http://www.bostonmarathon.org/BostonMarathon/WelcomeBooklet.asp#hydration http://www.bostonmarathon.org/BostonMarathon/WelcomeBooklet.asp#hydration]

</ref>

 

<ref name="Houston">Hew TD, Chorley JN, Cianca JC, et al. The incidence, risk factors and clinical manifestations of hyponatremia in marathon runners. Clin J Sports Med. 2003;13:41–47 http://www.ncbi.nlm.nih.gov/pubmed/12544163</ref>

 

</references>

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