When a mammal is exposed to a cold environment its metabolism increases and there may be a progressive increase in activity of skeletal muscle (Burton & Bronk, 1937) leading eventually to shivering. In small mammals metabolism also increases in tissues other than skeletal muscles (Davis & Meyer, 1955), but it is uncertain whether this is so in larger mammals including man (Burton & Edholm, 1955;Ruch & Fulton, 1960). The oxygen consumption of five subjects whose skin was cooled for 80-2 10 min was measured. Two subjects were healthy men, one had almost complete paralysis of skeletal muscle due to poliomyelitis and two were unconscious and were studied before and after receiving a muscle relaxant. (Hatfield, 1949); when his trunk was heated with a radiant-heat cradle there was normal vasodilatation in his hands measured in the same way, and sweating tested with Quinizarin (Guttmann, 1940) was normal. His metabolic rate was first examined without his having received any drugs, and then whilst receiving paralysing doses of D-tubocurarine. (Heights and weights are not available for the patients receiving IPPR).
METHODS