Weekly Half-Marathon, a couple of tweaks made quite a difference.

[iain]

I weighted myself before (before the 0.5L) and after: 71.70Kg before *and* after (would you believe that ?!).
So the 0.5+1.6 = 2.1L I drank compensated exactly what I lost.
By the way, 2.1Kg difference before/after was what I measured during an identical HM without any drinking not long ago.

I estimate that you probably used about 200g of glycogen during that row. I was wrong above, the water associated is actually 4 times the weight of the glycogen, so I would expect that you would lose 1kg if you stayed as hydrated. I know I drink too much when I have the chance when rowing, I assume because we are looking for the drink to cool us that we are not just looking to replace required fluid loss.