Folkalist...

It costs 70 kCal/hr just to warm 0 degree air to body temperature.

Hard shivvering costs 200 kCal/hr.

This is on top of your basal metabolism, which is the cost in energy to keep your body functioning at rest... usually around 1200 kCal per day.

Somewhere this subject has been covered pretty extensively... chack back in the archives, I'd say around November/December timeframe. I put together a presentation on hypothermia around that time and share some of what I learned (and now forgotten) with the group.

MNS
_________________________
YMMV. Viewer discretion is advised.