308 



PHYSIOLOGICAL REGULATIONS 



<i-Ca\Jk^. 



Fig. 144. Eate of heat loss in relation to mean heat load. Net heat equilibration 

 diagram. Man. Three individuals of 75 to 77 kg. in first 0.5 hour of rest indoors, 

 after physical exercise outdoors in the hot desert; or 3 individuals in the third 0.5 hour 

 after drinking ice water. In positive loads, both coordinates were computed from 

 changes of rectal temperature alone (xO.83), it being shown that surface temperatures 

 changed little. Further data of tests represented in figure 143. 



tests with smaller heat deficits made by Cannon et al. ('26). In 

 the conditions prevailing, the diminished rate of loss accompanies 

 lower surface temperatures, less sensible loss, and less loss by 

 vaporization. In other subjects, or in the same subjects diversely 



+1 +2 



Houri 

 Fig. 145. Bates of heat exchanges in relation to time after ice water was drunk 

 (Man, subject P, one test). Production was computed from rate of oxygen consumption, 

 vaporization (latent loss) from uncorrected rate of insensible weight loss, and net gain 

 from rate of change in mean body temperature using Burton's ('35) coefficients. The 

 ■drink, taken during 0.2 hour, imposed a heat debt of 0.74 Cal.Ag- Total loss is gain 

 by production minus net gain. New data of Pinson and Adolph ('42). 



