fluid weight loss during swim

RE: fluid weight loss during swim

smontanaro — Tue, 02 Mar 2010 09:41:49 GMT

This study looks at how much fluid loss occurs during swimming: www.swim-city.com/library.php3 It seems to be based on the assumption that weight loss is the sum of urination and sweat loss. What about metabolic water production? Any idea how much that is? Is it significant compared with sweating? (Sorry, can't do subscripts): C6H12O6 + 6O2 -> 6CO2 + 6H2O + energy (ATP) While I'm sure some of that water is exhaled, much of it probably exits through the kidneys as well. Skip

RE: fluid weight loss during swim

Former Member — Tue, 02 Mar 2010 06:32:32 GMT

This study looks at how much fluid loss occurs during swimming: www.swim-city.com/library.php3 It seems to be based on the assumption that weight loss is the sum of urination and sweat loss. I read that study. Maybe it is just sweat. The next time I see that guy who told me it was osmosis, I'll ask more questions. Also, I did a little research on rehydrating and what a good level of sodium is, but that can be another subject.

RE: fluid weight loss during swim

ourswimmer — Mon, 01 Mar 2010 12:55:58 GMT

I don't know about you, but personally I'm not peeing in the pool. :) I think we should stipulate right here to assume that everyone is courteous, sensible, and properly socialized, and thus that everyone gets out for the last step in the dehydration process I described. I certainly never said anything about staying in the pool.

RE: fluid weight loss during swim

knelson — Mon, 01 Mar 2010 12:41:31 GMT

The water isn't escaping your body through your skin, though. It's escaping through your kidneys. I don't know about you, but personally I'm not peeing in the pool. :)

RE: fluid weight loss during swim

Former Member — Mon, 01 Mar 2010 12:31:22 GMT

I wonder it those salt sanitized pools are less likely to make your skin prune up. Since I only get to train in a saltwater pool, I don't prune up that quick, but it can REALLY dry your skin out if you don't shower and moisturize right after a workout.

RE: fluid weight loss during swim

ourswimmer — Mon, 01 Mar 2010 12:26:03 GMT

Aside from sweating, you lose water while swimming because the water in the pool pushes harder on your body than does air. It's like wearing a big compression sock. The water isn't escaping your body through your skin, though. It's escaping through your kidneys.

RE: fluid weight loss during swim

Former Member — Mon, 01 Mar 2010 11:11:28 GMT

This study looks at how much fluid loss occurs during swimming: www.swim-city.com/library.php3 It seems to be based on the assumption that weight loss is the sum of urination and sweat loss.

RE: fluid weight loss during swim

orca1946 — Mon, 01 Mar 2010 03:58:42 GMT

B4 practice & after - NEVER during !!! OOHH sick !

RE: fluid weight loss during swim

knelson — Mon, 01 Mar 2010 01:35:46 GMT

It doesn't have that effect on me. I rarely have to get out to pee during a workout.

RE: fluid weight loss during swim

magick17 — Mon, 01 Mar 2010 01:07:45 GMT

escaping from your kidneys...is that a good thing or bad thing?

RE: fluid weight loss during swim

Former Member — Sun, 28 Feb 2010 13:04:58 GMT

I don't think it's sweat, but I don't really know for sure. I suspect pool water has a lower osmolality than plasma, so I'm confused why water would diffuse from your body to the pool (assuming that's what's actually happening) and not the other way around. I wouldn't be surprised if I have it completely backwards. Like I said I didn't understand his explanation the first time, and I haven't seen him lately to ask again.

RE: fluid weight loss during swim

Former Member — Sun, 28 Feb 2010 12:35:02 GMT

In a good workout you lose 1-2 pounds of water. We had a scientist in our group who I haven't seen in a while, otherwise I would ask him, who explained it to me once but I forgot the explanation. It had something to do with osmosis (it is not perspiration in the usual sense), and fluid leaving your body in an attempt to achieve equilibrium with the water you are immersed in. It is the same process that makes fingertips prune up. What I'm wondering is what this loss of fluid does to the sodium/potassium balance and is it related to getting cramps after an hour or so. You mean it isn't sweat? I'm surprised to hear that. I've always thought it was perspiration, just not apparent because of being in the water. That is the only explanation I've ever heard. If there's another, I'd like to know.

RE: fluid weight loss during swim

Former Member — Sun, 28 Feb 2010 12:15:50 GMT

I always assumed it was mainly sweat, same as any other intense workout, but less visible...

RE: fluid weight loss during swim

joshua — Sun, 28 Feb 2010 11:04:06 GMT

In a good workout you lose 1-2 pounds of water. Wouldn't that greatly depend on your body weight and the temperature of the water?

RE: fluid weight loss during swim

__steve__ — Sun, 28 Feb 2010 07:50:19 GMT

I wonder it those salt sanitized pools are less likely to make your skin prune up.