The concept of heat loss through the head has not been debunked, just the exaggerated % that had been given.
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In 2006, scientists revisited the question. They tested subjects in cold water with and without wetsuits, sometimes with their heads out of water and sometimes with their heads submerged. They found that the head accounts for about 7 percent of the body’s surface area, and the heat loss is fairly proportional to the amount of skin that’s showing.
At most, according to a 2008 report in BMJ, a person loses 7 percent to 10 percent of their body heat through their head.
FWIW.
If you take the time it takes, it takes less time. --Pat Parelli
American by birth; Alaskan by choice. --ironbender
