HEAT 



315 



Diverse heat deficits are represented by particular rates of 

 exchanges in the course of a single recovery (fig. 149), each load 

 being computed from rectal temperature. In calories, heat gain 

 (production) is modified most; relative to turnover, heat loss 

 changes most. Each path of exchange being modified in a manner 

 appropriate to the recovery of heat content, the spread between 

 heat gain and heat loss is large, showing economy ratios of over 3. 



Heal Load-Cal./Uq. 



29 



31 



33 



35 



37 39 



Recfal Temperature - °C. 

 Fig. 149. Eate of heat exchange in relation to heat load (adult normandy rabbit 

 4). The data are from a single test, the individual being previously cooled by nar- 

 cotization and immersion in ice water while encased in a rubber sack. Eewarming 

 started at a rectal temperature of 28.7° C. when put into a calorimeter at 20° C. Heat 

 exchanges are in Cal. Ag. hr. A, heat gain computed in short periods as heat loss + 

 heat retention; B, heat gain computed from oxygen consumption; C, heat loss measured 

 by direct calorimetry; D, heat loss by vaporization of water. Heat load in Cal.Ag- 

 is computed from rectal temperature minus 39° C. x 0.83. Data of Gasnier and Mayer 

 ('35, p. 156). 



The net heat exchanges in relation to heat load may be represented 

 in a partial equilibration diagram similar to that in man and other 

 animals (fig. 150), but covering a much larger range of negative 

 loads. 



