Interesting point. I also find it interesting that we can condition our bodies to defend against hypothermia as well. It isn't very effective, but it could mean that extra minute or two before you completely lose it. I would assume that in extreme exposure, it is going to be insignificant.
Maybe this is called acclimation? It seems to hold some truth for hyperthermia as well. Given time, our bodies can adapt somewhat to the general environment. I find that having been in Iraq for so long now, I do not need to sweat as hard during hundred degree days, and consequently freeze back home when it is 70 degrees (farenheit, I don't do celsius, hope I spelled that right).
I tell you what, it has to be a pretty blustery day for me to keep my overshirt on when working on the woodpile for any length of time. Once I get in my groove, about all I can stand is a tee shirt, even if it starts snowing out. <img src="/images/graemlins/grin.gif" alt="" />
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The ultimate result of shielding men from the effects of folly is to fill the world with fools.
-- Herbert Spencer, English Philosopher (1820-1903)