每天真的要喝八杯水吗？_BEC初级作文

每天真的要喝八杯水吗？

Then their performance was assessed after rehydration with either 1) nothing, 2) enough water to bring them back to 2% dehydration or 3) after full rehydration.

So far nothing unusual, but the difference between this and almost every other study that's ever been done on hydration was that the cyclists were blind to how much water they got. The fluid was given intravenously without them knowing the volume.

This is vital because we all, and especially athletes, have such an intimate psychological relationship with water consumption.

Remarkably, there was no performance difference between those that were fully rehydrated and those that got nothing. This study was part of a growing movement to "drink to thirst" which hopes to persuade athletes not to over hydrate with the potentially fatal consequence of diluting your sodium level, causing hyponatraemia.

Perhaps the result shouldn't be so surprising. Humans evolved doing intense exercise in extreme heat and dryness. We are able to tolerate losses in water relatively well whereas even slight over hydration can be far more dangerous. In simple terms, being too watery is as bad for you as being too concentrated.

But what about the rest of us who aren't cycling around the desert in Western Australia?

There is a very well accepted idea that we should drink about eight cups of water per day (two to three litres) in addition to our food and other drinks.