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This week, on HBO's REAL SPORTS with Bryant Gumble, which will air several 
times still, there is a comprehensive exploration of hyponatremia in human 
marathon athletes. Suggest everyone try to watch it.

Hyponatremia demonstrates many of the same symptoms of dehydration and is 
caused by too much fluid intake--salted or elyted or not. An athlete that has 
gained 3% or more during a race is likely to be suffering from hyponatremia 
while the same athlete losing 3% of body weight is likely to be dehydrated. 
Confusion is one symptom that differentiates hyponatremia from dehydration--the 
brain is swelling. If a hyponatremic athlete is given more fluids, death can be 
the result.

ti


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