"What were you hoping to know that wasn't covered? It's not clear from the article but I am a physician and can add additional information. I tried to strike a balance between the practical and technical--but can be more technical if you have a specific question"
I had no idea you were a physician. While I applaud your understatement, it might be valuable to include your credentials (at least an M.D. behind your name).
Here are some further questions that I'll let you be the judge of whether or not they belong in the article.
How much variability in the quantities of water/sodium for people who sweat profusely? My teen son doesn't sweat at all. Not even in sweat tests at the doctor. Me? I sweat profusely. I can be drenched head to toe in a humid environment within an hour, and consume 5 liters of water in ~6 hours of hill hiking and still be dehydrated with dark yellow urine. Should I be consuming more
I like your guideline of adding 300-600mg sodium per liter. Is there a guideline for total sodium I should be consuming that I can look at my meals and beef jerky to balance? Should I be worried about ensuring I don't overload?
You talk of sodium. What of all the other electrolytes that other companies are adamant that we'll keel over without? My understanding is that Magnesium is important, but a quote I just found onthe Succeed website: “Magnesium is another intracellular ion that, like potassium, is lost in sweat and urine during exercise. But the losses are trivial. There is no published evidence showing that magnesium deficiency is either common amongst the physically active, or that magnesium supplementation can either increase the intracellular magnesium stores, or enhance performance.” Dr. Timothy Noakes Sports Nutrition: Fluid, Electrolytes, and Minerals (Report from the World Forum on Physical Activity and Sport, Quebec City, Canada, 1995.)
The symptoms of hyponatremia sound very similar to dehydration: poor performance, cramps, lightheadedness, low blood pressure. Are there better differentiators? Are there field tests that can be performed for both (ie.I had forgotten about the pinch test for dehydration)?