Abstract
1. 1. Changes in tail blood flow, rectal, colonic and tail temperature produced by simulated diving were measured in anaesthetised rats, and the temperature changes were compared with those produced by arresting tail flow with a tourniquet. 2. 2. “Diving” produced a rapid fall in tail blood flow from 30 to 40 ml/100 ml per min to zero within 15–30 sec. 3. 3. Tail temperature fell at the same rate whether tail flow was halted by “diving” or tourniquet. 4. 4. Rectal, and sometimes colonic, temperature fell during “diving”; both rose with tail tourniquet. 5. 5. Colonic temperature fell below pre-procedure level when tail temperature and flow recovered after “diving”. 6. 6. Metabolic depression induced by “diving” is suggested.
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