## ECF volume change after exercise

**Moderator:** BioTeam

### ECF volume change after exercise

after a vigorous exercise, a 100kg man loses 4kg but sodium level remains constant.What is the ECF volume after exercise?

Im sure 4L of water is lost from ECF. Now ECF:ICF = 36:60 L

Sodium not excreted so osmolarity of ECF increases and some water will move from ICF

how do I calculate how much water moves from ICF? I know that the omsolarity will have to balance but I have no idea how to determine numerically. Any help?

Thanks

Im sure 4L of water is lost from ECF. Now ECF:ICF = 36:60 L

Sodium not excreted so osmolarity of ECF increases and some water will move from ICF

how do I calculate how much water moves from ICF? I know that the omsolarity will have to balance but I have no idea how to determine numerically. Any help?

Thanks

### Re: ECF volume change after exercise

becuase it says that sodium level does not change so only water excreted...?

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