308 



TEMPERATURE AND HUMIDITY 



water vapor into the submarine during 

 preparation and eating of meals. 



3. A thorough study should be made of 

 the effects of sustained thermal stress and 

 elevated body temperature upon the morale 

 and the health of the crew and the crew's 

 effectiveness in simulated battle practice. 



Summary 



The primary facts of human heat produc- 

 tion have been surveyed in relation to the 

 basic physical laws that govern the thermal 

 interchange Avith the environment. The 

 physiological mechanisms that achieve 

 temperature regulation of the human body 

 have been described in relation to the three 

 principal phases of this adjustment. Data 

 to illustrate the variation of physiological 

 stress and subjective comfort in different 

 regions of temperature exposure and with 

 different levels of heat production have been 

 presented. In these analyses, the basic 

 equations of physiological heat exchange 

 have been used to illustrate the methods 

 employed in analyzing the physiological 

 adjustments and in assessing the combined 

 thermal effect of environment. Utilitarian 

 standards relating to comfort and the 

 thermal efficiency of clothing have been 

 discussed. 



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