ADVANCED CHEMICAL PHYSIOLOGY 



337 



FOB EACH LITRE OF O 2 CONSUMED. 



Therefore with a non-protein respiratory quotient of 0-83 an intake 

 of 384 c.c. oxygen works out in calories as 0-384 x 4-9023 =1-88 cals. per 

 minute. 



It is obvious that these results are only of value in relation to the 

 subject on whom the experiment was done, therefore, to make the 

 results of more general value, they must be related to some standard. 

 The standard at present in vogue is that of the superficial area in square 

 metres. The formula for obtaining this value has been determined by 

 D. and E. F. Du Bois. It is : 



Surface area = W- 2S x H' 725 x 71-84. 



In order to expedite calculation they devised a most ingenious 

 chart (Fig. 206). 



If the amount of external muscular work done is known it can also be 

 converted from kilogramme tres, the usual method of assessment, into 

 calories. 427 kgm. are equal to 1 Calorie. 



SO 60 70 80 



Weight - Kilograms. 



Fio. 206. 



AA 



