I’m no doctor, first off…but I have been dealing with cramping for a few seasons now. First, this may seem like a crazy question, but do you use nicotine or more specifically, smokeless tobacco like Skoal? I admit, I did full tilt since college for about 7 years total. That said, when I was working with my physician on cramping after normal diet logs, sodium counts, tempatures, CBC etc etc…I forgot to mention this to him. I finally did and he came up with a condition called Hypokalemia. This is basically the bodies inability to process potassium correctly, or not storing it properly. In my case, my CBC concluded that my potassium levels were at the low end of normal walking around, nothing alarming on a typical lipid panel, but after an hour run, then blood test, it was well below the normal levels. Exercise caused my potassium levels to drop. Potassium, along with sodium are major causes of muscle cramping.
The reason I asked about chewing tobacco is because it sometimes contains glycyrrhizic, which is an added flavoring…such as in skoal mint, wintergreen, cherry, etc. This is a common ingredient in many things, more famous for typical candies and teas. It is 30x stronger than most sweetners. After long time use of this and taking it straight to the blood stream, along with the nicotine and fiber glass ripping my gums apart…it may or may not have caused my body to stop regulating potassium correctly, especially the stores during or after exercise.
After I stopped using (still working on Nicorette gum, yes tobacco is addictive, I never thought I had a problem until I found myself not able to quit cold turkey), was prescribed a potassium tablet and worked with sodium tablets (pharma grade, not that Hammer shit they claim works)…the cramping has stopped completely.
Other than that, I can’t offer any advise, I would try the sodium supplements and check your BP regularly for fluctuation daily. It could be a potassium issue, like in my case. If you use chewing tobacco, which most triathletes don’t, stop…it help me.