I've always looked for shivering as a sign I'm starting to get to cold (and stopping shivering being even worse). Recent experiences suggest this isn't very useful for me, as I tend to get to the being too cold stage without going through a shivering cycle. I don't know if this is related to doing exercise, as inevitably when I've had problems, it's been during an event (eg KIMM this weekend).
I've now come to recognize when I've got a problem, as my thought processes noticeably slow down, and my body stops working so well. This is a definite sign to put more on. Unfortunately, as in the Adrenalin Rush this year, I may already be wearing all the clothes I've got!
I'm the same. One moment fine, the next I can barely move. For me it often happens when I'm belaying, which is not the greatest time to start putting on more clothes. A hot drink works wonders, but of course that's not always a possibility.
I don't seem to shiver much. I can control it sometimes though. If I'm shivering a lot, and don't want to then I merely relax my muscles, and kind of drop my shoulders into a relaxed state, and I stop shivering.
It's something to do with being comfortable in the cold,a nd relaxing so you're not tensed up. You obvioulsy spend so much time outside, that you don't mind freezing your ar$e off.
