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it is nature's method of preventing freezing. The digestion of food will increase heat production. The increase is prompt but brief for carbohydrates, much prolonged and higher for proteins, slow for fats. These facts, applied to the technique of winter mountaineering, lead to the following conclusions: There is no great difficulty keeping the body as awhole warm while vigorously exercising. If one is cold during the night, food is desirable. Vigorous shivering, though uncomfortable, is themost effective way of getting warm inside a sleeping bag. Another excellent method is to tense the muscles ofthe body strenuously; relaxing and tensing alternately until heavy puffing and warmth result. |
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