198 



Metabolism of Healthy Man. 



the bedding, or from the surface of the heat-absorbing system inside of the 

 chamber. On the other hand, when we attempt to apportion the heat elimina- 

 tion between the heat of radiation and conduction, and the heat required to 

 vaporize water from the lungs and skin, it is necessary to take into considera- 

 tion not only the water vaporized and carried out of the chamber in the air- 



Table 80. Proportions of total heat output used to vaporize water from the lungs 



and skin during different conditions of activity. 



[Averages of amounts for 24 hours.] 



1 Factor used. 0.502. 



2 Heat equivalent of work done 



3 Heat equivalent of work done 



4 Heat equivalent of work done 



5 Heat equivalent of work done 

 8 Heat equivalent of work done 



7 Heat equivalent of work done 1482 calories 



8 Heat equivalent of work done 957 calories 



160 to 250 calorics. 

 130 to 280 calories. 

 480 to 660 calories. 

 420 calories. 

 450 to 460 calories. 



Rode ergometer till 7 a. m. 



Rode ergometer till 3 a. m. 



current, but likewise to take into account the amount of water leaving the sub- 

 ject's body and condensed to a greater or less degree upon the surface of the 

 heat-absorbing system. This requires not only analyses of the outgoing air to 

 determine the amount of water-vapor leaving the chamber as such but likewise 

 involves weighing the heat-absorbing system inside the chamber for the purpose 



