I propose that the sapient quote from the update you link to is found here:
Research at the Army Research in Environmental Medicine labs showed that there was a temporary increase in heat loss through the scalp that returned to the baseline of 7% as the subjects continued to exercise.
In this case, the excercising test subjects, the increase in heat loss through the scalp was temporary (I would say a matter of minutes, but that's just my opinion), and returned to the 7% figure. The ONLY exception listed here (and I did refer to this in an earlier post), is the shivering hypothermia victim, which again, I feel is too limited a population to base our general heat loss figures on.
Instead of making the claim, "Wear a hat because you can lose 55% of your bodies heat through your scalp.", It would be much more accurate to say, "Wear a hat because you can lose 10% of your bodies heat through your scalp, unless you happen to be a near death hypothermia victim in which case it jumps to 55%."
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