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Studies on the mechanism of shock. Thermoregulation during limb ischaemia.

Abstract 
The effect of changes in environmental temperature (4·7-30°) on the rate of O2 consumption of rats during a period of bilateral hind-limb ischaemia produced by tourniquets has been investigated. Unlike previous experiments on rats after limb ischaemia, while the tourniquets were in place O2 consumption was increased at environmental temperatures between 30° and 10°. Over this ambient temperature range the slope of the regression line for O2 consumption on environmental temperature axis was greater than in the controls, but their intercepts on the temperature axis were the same, indicating that the effect was mainly due to decreased insulation. This was attributed to the postural effects of the tourniquets. The results show that during limb ischaemia in 20° acclimated rats when shivering thermogenesis is inhibited, a demand for extra heat can be met by increased non-shivering thermogenesis. Previous work has shown that after removal of the tourniquets, the situation is different as then both shivering and non-shivering thermogenesis are inhibited. These findings are discussed from the point of view of thermoregulation in normal and injured rats.