NORMAL PROCESSES OF ENERGY METABOLISM 659 



of approximately the same body weight with two of their aged subjects. 

 A ub and DuBois determined the basal metabolism of six old men 

 between the ages of 75 and 85 years. The authors describe their subjects 

 MS **in good condition and fairly well nourished, though on plain and some- 

 what scanty diets. Considering their ages, they were in good health, 

 i hough most of them suffered from, arteriosclerosis, chronic interstitial 

 nephritis and emphysema, which 'normally' accompany advanced years." 



34 73 95 12 



145 



89 ' 



19 20-5 22 

 106 Il2 117 



25 27 30 33 35 40 45 50 KG 

 I22J27I33 137 142 148 155 160 CM. 



1.000 



I 2 3 4 5 6 

 '5" 2'9.5"2'H" 3*2* 3' 6" 3'8* 



751621 27 32 



9 10 II 12 13 14 I5YHS. 

 4 4'2" 4'4~ 4'6" 4*6" 4'lO" 5*1* y3VT.fcl 

 36 41 45 495545 60 67 72 60 80 99 III IBS. 



Fig. 45. Metabolism in calories per day of boys from birth to 15 years of age. 



(After Lusk.f 



The average basal heat production was 35.1 calories per square meter 

 (linear formula) per hour, which is 12 per cent below the average for 

 men between the ages of 20 and 50. The respiratory quotients lay be- 

 tween 77 and 86, the average being 81. Since these subjects had been 

 on rather meager fare and were kept in the metabolism ward of Bellevuq 

 Hospital for several days before the tests were made, the low metabolism 

 and rather low quotients are in part accounted for by these factors. How- 

 ever, since these conditions accord with the usual routine of life for sub- 

 jects of very advanced ago the metabolism findings are such as would ortli- 

 narilv obtain. 



