62 



PHYSIOLOGY OF INDUCED HYPOTHERMIA 



HOURS 

 DAILY 012345678 



I I I I I I 



24 DAILY 

 "I 



45 

 44 

 43 

 42 

 -41 

 40 

 39 i^ 

 38S 



36 S 



UJ 



35Q. 



34 2 

 -33'] 

 -^32^ 



31 a 



30°^ 



29 



28 

 27 



26 



DAILY I 



2 3 4 5 6 

 HOURS 



7 8^ 



24 DAILY 



/30»C^J 



Z^C^y 



DOGS 28 a 35 



/ / / ^ ' y / ■ 



25 



Fig. 1. — Upper Portion. Deep colonic temperature of a dog when it was subjected to (1) a 

 moderate cooling load for 6 hours, solid circles, and (2) a heavy cooling load for _'4 liours, 

 crosses. The presence of shivering is indicated by stippling between temperature points. Note 

 that the heavier the cooling load the more vigorous is the physiolo.^ical resistance to core 

 hypothermia. Lozwr Portion. Body cooling curves of two completely poikilothermic dogs when 

 they were abruptly subjected to tiie same C(n)ling load. Solid lines between temperature points 

 indicate the absence of shivering. Note the straight line fall in body temperature while housed 

 at 3° C. and absence of any spontaneous rise when removed to an ambient temperature of 22° C. 



