NORMAL PROCESSES OF ENERGY METABOLISM 657 



even greater than the difference in basal metabolism between boys and 

 girls (Fig. 43) of the same age. This is due to the greater degree of 

 composure readily induced in girls of the adolescent age. 





Fig. 44. Basal heat production of boys from birth to puberty (continuous line 

 according to Benedict and Talbot I . x x x x Active cases of Sonden and Tigerstedt. 

 Total Calories per kilogram referred to age. 



Sonden and Tigerstedt give the following values for two of their boys 

 during sleep : 



Boy of 11 yrs. 3 mos. 14.09 gm. CO 2 per sq. M (Meeh) and hour. 

 " " 12 " 13.78 " " " " " 



From which we may derive the following heat production on the assump- 

 tion of a R. Q. of 0.88: 



Boy of 11 yrs. 3 mos. 35.1 cal. per Sq. M. and Hr. 



<< 12 a _ 343 



Boys of the same age in school showed a heat production of fully twice as 

 much (Table 38). 



Von Willebrand's observations were made upon boys from 9 to 14 

 years of age in the apparatus used by Olin. They were confined for the 

 entire 24 hours, taking all three meals in the apparatus. They went to 

 bed at 8 to 9 P. M. and rose in the morning about 6 o'clock. In some 

 instances the subjects slept for a short time during the day. The differ- 

 ence between waking and sleeping metabolism for four individuals is 

 shown in the following table somewhat modified from one given by 

 Benedict and Talbot (c). 



