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Thursday, January 8, 2009
Mythcrushing
Myth: Most Body Heat Loss Is Through The Head And Neck
The US Army Field manual for survival recommends covering your head in cold weather because "40 to 45 percent of body heat" is lost through the head. If this were true, humans would be just as cold if they went without trousers and/or shirts as if they went without a hat. A recent study confirms that there is nothing special about the head and heat loss. Any uncovered part of the body loses heat and will reduce the core body temperature proportionally. So, if it is cold outside, you should protect your body - and head - and neck.
Cite the above as: BMJ (British Medical Journal) 2008;337:a2769
http://www.bmj.com/cgi/content/full/337/dec17_2/a2769
The US Army Field manual for survival recommends covering your head in cold weather because "40 to 45 percent of body heat" is lost through the head. If this were true, humans would be just as cold if they went without trousers and/or shirts as if they went without a hat. A recent study confirms that there is nothing special about the head and heat loss. Any uncovered part of the body loses heat and will reduce the core body temperature proportionally. So, if it is cold outside, you should protect your body - and head - and neck.
Cite the above as: BMJ (British Medical Journal) 2008;337:a2769
http://www.bmj.com/cgi/content/full/337/dec17_2/a2769
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