Three common studies of marathoners and hyponatremia... mostly indicating that it (hyponatremia) does occur.(1,2,3) As for it's relationshipp with NSAID's and Hyponatremia, the studies were not (IMO) stastically conclusive but shouldn't be negated either. It seems the population was small and the studies showed a relationship between NSAID useage and Hyponatremia. When you say tenious... I might agree to some degree if you consider about a 50/50 chance (1,2, loosely interpretated) with studies that were a relatively small population.(2) Again, I think the problem has not be studied enough to verify the relationship - specially since other factors were present as well.
http://www.ncbi.nlm.nih.gov/...p;list_uids=11399389 http://www.ncbi.nlm.nih.gov/...p;list_uids=12544163 http://www.ncbi.nlm.nih.gov/...p;list_uids=11828223 I think it was once put very nicely when it was said by a med. tent doctor (to paraphrase)... "I have always seen a conscience and capable of drinking person recover from dehydration without IV's... even if they feel horrible... but have seen almost every instance of IV complicate issues when misapplied because of improper diagnoses as hyponatremia caused by too much fluid intake versus hyponatremia caused by kidneys problems resulting in the bodies inability to process fluids". I think the point that was being made was IV's have the potential to being more problematic that some might expect. NOTE: I am referencing IM distance races.
I will agree... the relationship between NSAID and ultra-endurance events are problematic in their relationship... However, there is a relationship... the question is how much of a relationship. I prefer to err on the side of eliminate useage prior to and definately during during a long term activity. That's just playing it safe. When it comes to inflamation vs. kidney damage, I choose inflamation.
I believe NSAID's are a recovery medication and shouldn't be used as a drug to enhance performance. It also shouldn't be used as a replacement for good training practices. Renal failure is serious. And, to increase that risk seems irrational. Specially since the point of toxicity has not been determined. There is no study I have seen that defines at what dosage amount, frequencey, timing or high risk individuals are associated with NSAID induced renal failure and ultra-endurance sports. But, there are studies that indicate an association - is it a sufficient association? Difficult to determine at this time (IMHO).
FWIW Joe Moya