658 



JOHN R. MURLItf 



TABLE 39 

 METABOLISM OF BOYS AWAKE AND SLEEPING (Von Willebrand) 



T Meeh's formula using 12.205 for the first two boys and 12.847 for the second two. 

 Heat is calculated from the CO 2 assuming an R. Q. of 0.83. 



Rubner's experiments wero made upon two brothers, one fat and one 

 thin, the sons of parents of slender means and therefore not likely to be 

 overfed. They were confined for about 22 out of the 24 hours in the 

 respiration chamber, ate and slept there and during waking hours were 

 permitted to move about, even walking some. The following summary of 

 the results are given by Lusk(/i). 



TABLE 40 

 METABOLISM OF A FAT AND THIN BOY (Rubner, after Lusk) 



The last column may be compared with the results of v. Willebrand 

 (Table 30) and those of Sonden and Tigerstedt (Table 38). 



A most interesting phase of the activity metabolism in children, name- 

 ly, the muscular efficiency as compared with adults, has never been studied. 

 !Nor has any attempt been made to estimate the actual energy expenditure 

 of an active child for the entire 24 hours. How much the values just given 

 for boys who were permitted to move about to a limited extent in the 

 respiration chamber falls short of the actual daily requirements with its 

 large quota for growth may be gained from the following chart taken 

 from Lusk (/) (Pig. 45). 



I. Energy Metabolism of Old Age 



In modern times the energy metabolism of old age has been studied by 

 three sets of observers. Magnus-Levy and Falk studied by means of the 

 Zuntz-Geppert method five old men and seven old women. One of 

 their tables has been reproduced 011 page 648 where comparison is made 

 between the metabolism of a boy and a girl and of middle aged subjects 



