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Originally Posted by mAtThEw
What's this about sodium in the water?
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Going back to basic physiology for a sec here. Sodium is actively pumped out of the cell. Your body can't actively pump water. However water follows sodium. Have sodium means that you actually retain the liquid you are drinking.
Research study i was look at a few weeks ago said that the sodium levels needed for maximum retention of water was 50mmol.L, most sports drinks are only 5mmol.L.
They also showed that if you were trying to re-hydrate without sodium present then the more plain water you drank the more you pissed out but you didn't retain more.
I was basically saying before that if you are sweating due to a hot or humid day then its important to make sure you have a sports drink or at least some salt on your food in the hours leading up to your workout.