Marathon Runners Drink Too Much
Study: Dangerous Salt Loss Linked to Drinking Too Many Fluids
Of course, weather conditions play a major role. It's a good idea to train
and to test for appropriate fluid intake in the same weather as you expect for
Levine and Thompson point to the advice of USA Track and Field: Use thirst
as your guide to fluid replacement.
But the American College of Sports Medicine (ACSM) has a different point of
They say that thirst is often a poor indicator of our body's fluid
"Water in particular quenches the sensation of thirst before body fluid
replacement is achieved, so thirst should not be the only determinant of how
much fluid is consumed under such conditions," says the ACSM.