How do you store your water bladder?

Is that a diagnosed condition, or is it more of a weight thing? Cos I'm good at cutting weight, equally good at putting it back on, and it really is very marked how much more I sweat for every kg of dead weight currently attached to my frame.

Nope. An actual condition. Irrespective of weight.

I appreciate how annoying it is to have your condition, Kreig. We've just come back from climbing Mt Oxford in very light drizzle but Frank sweated heavily into his nylon shirt, drenching it under his rain shell layers and then as soon as he reached the summit, he had to turn around and begin his descent because he was pretty soaked and cold. It's a real nuisance and he had to defer eating his lunch until we got down below the bushline out of the breeze. Whereas I was quite happy to sit up there for 20 minutes, having my lunch. As soon as I got there, I whipped off my dampish shirt and put it on over a thin polarfleece jacket to keep it warm and then put 3 jackets over that (permaloft, down and goretex). In more serious weather we wear the 'transistion' shirts from Mountain Hardwear. They wick the moisture out and enable evapouration.

bare in mind, people who exercise in conditions where they will be sweating can sweat up to twice as much as people who arent exercising in conditions where they sweat much. tests have been done confirming this in the british army. soldiers stationed in the desert were given physical work to do alongside soldiers who had just been brought out from a british winter. the desert trained soldiers had more highly developed senses of thirst and drank on average twice as much as the unconditioned soldiers and sweated twice as much but i'm not denying the condition Kreig has mentioned at all, just saying its an additional factor in sweat output and having more body far can further increase sweating as well. there can be a number of combined factors that determine how much you will sweat, at the end of the day two people doing the same exercise in the same conditions can sweat completely differing volumes...

I'm sure you've heard me say my maxim: Tramp wet, hut dry. That's because I'm ALWAYS wet. No matter what the conditions are. Everybody sweats when they reach a certain level of activity. I sweat - excessively - with ANY activity. A number of years ago, I actually measured my sweat output in various situations. Basically, I need to drink a minimum 3 litres of water a day. That's just sitting on my arse. In winter. When exercising, I sometimes have to consume up to 8 litres per day. I've previously mentioned, I have almost succumbed to dehydration twice. Whether I'm relatively unfit (like now), or when I was running 6 half-marathons, cycling, and doing 12 gym classes every single week, my sweat output is significantly greater than almost anyone in the same scenario. There is medication you can take. Which I used to. Instead, I have chosen to move to New Zealand. Wet, cool parts of NZ, to be specific. It is dead-set the number 1 reason I moved over here. I almost never get cold. It takes a LOT! But I overheat very, very easily. So.... REGARDLESS of my level of fitness at any given time, the environment I find myself in, other stressors; it doesn't matter. I run significantly hotter than almost anyone else... And sweat like an escort in church.

"I almost never get cold. It takes a LOT! But I overheat very, very easily." I can relate to most of this Kreig, always stated I run my own furnace, also why I prefer to Tramp/Walk in Winter or seasonal cusps Coming in a bit late here as more of a lurker ....

I would often get headaches after a day of heavy sweating/water drinking. Taking one or two electrolyte tablets on those days has eliminated them.

Yes - with you on that one @Chriss. Hot days working hard often get to the stage I can't take water at all - even trying to drink it causes nausea. Whereas the Electrolytes go down a treat. Currently working my way through the 200 sachets of enerlyte I got given on prescription when I had giardia!

electrolytes, even common salt can be the key when you need to drink a lot of water, sodium loss in sweat needs to be replaced, its hard absorbing water when you're low in salt and having salt in your drinking water makes it easier to absorb quarter of a teaspoon of salt per litre of water, is the standard recommendation, or at least with a salty snack or electrolytes per instructions, try out electrolytes in advance of tramps to make sure they dont cause any gastro problems, some can for some people. watch sports electrolyte supplements with sugar in them, sugar slows down water absorption, it requires greater dilution than ordinary carbs to be absorbed... you can loose nearly a gram of sodium per litre of sweat on a long days tramp when you're sweating a lot it becomes important to replace it http://www.slowtwitch.com/Training/General_Physiology/The_Math_of_salt_loss_1093.html

Yep. A combination of water and electrolytes. When conducting heavy, sustained exercise.