Water intake of normal and desalivate rats on exposure to environmental heat

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Abstract
The water intakes of desalivate and normal male rats were compared before, during, and after 5 h of heat stress (36 °C). Increased drinking occurred in both groups during the first 30 min of heat exposure The intakes were low and essentially similar for the next 90 min in the heat; after this period the controls drank significantly more water than the desalivate rats. Colonic temperatures were elevated only in the desalivate group during heat exposure; temperatures fell to subnormal levels in all animals after return to the 22 °C environment. From these findings it is postulated that stimulation of thermoreceptors, probably peripheral, is responsible for the drinking that occurs immediately upon heat exposure. Dehydration would not appear to cause an increase in water intake until longer exposure and significant water loss have occurred.

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