The danger in just water on long or particularly heavy rides is electrolyte loss through sweat, replacing lost fluid and electrolytes with just water means that you dilute what electrolytes (mainly salt) you have left even further, thereby resulting in hyponatremia - which can be deadly.
Sodium is concentrated in your bloodstream, potassium is concentrated in your cells, there is some of each in both places though. When you sweat, salt goes with it (salt and water follow each other). If you are low on sodium in your blood vessels, then the water will soak into the cells - this is probably part of the phenomena - a little of it anyway - that results in swelling of your legs and other dependant areas.
so....the answer is to drink to thirst but don't OVER drink, and if you are riding for over an hour replace some of that water by using an electrolyte solution of some kind - IE gatorade or whatever it is you tolerate - in addition to a bit of water. Pedialyte (the store brand is cheaper and just as good) is a good one. It is used for kids when they can't eat due to vomiting and dehydration. It is a physiological electrolyte and fluid replacement formula designed to balance the salt, potassium and water levels in your body. It doesn't taste good, but then niether does Gatorade for the most part!



Reply With Quote
