234 Metabolism of Healthy Man. 



The classification by age is extremely unsatisfactory in that we have but 2 

 individuals in one of the groups. The two subjects with the low metabolism 

 who were included in the group of short fat men are likewise classified in the 

 group of subjects from 54 to 59 years of age, and we here deal with the question 

 as to whether this low metabolism was due to age or to the physical characteristics 

 of these men. These points the experiments will not answer and obviously we 

 must await the accumulation of further data. 



The average values given at the foot of table 97 are not the averages of the 

 experiments here given, but the averages of all the experiments we have with 

 subjects during sleep. They are taken from the general tables 55, 67, 71, and 

 75, and represent, we believe, the average for individuals of body-weight and 

 physical condition reported upon here. It would seem that on the whole there 

 is not as striking a difference between the groups of tall men and short men 

 when compared with the average. On the other hand, the lean men have a dis- 

 tinctly higher metabolism and the short fat men, group I, a distinctly lower 

 metabolism. Those subjects under 20 years have a noticeably higher metabolism 

 than the older subjects, and their metabolism is considerably higher than the 

 average. 



INFLUENCE OF WEIGHT, HEIGHT, AND AGE ON METABOLISM DURING 



WAKING HOURS. 



In connection with the researches at Wesleyan University, a large number 

 of short experiments were made during the day on certain individuals with 

 striking physical characteristics which permit of their being classified into 

 groups similar to those in table 97. These experiments were much shorter and 

 hence have not the accuracy of the longer experiments which included night 

 periods. The results of these short experiments, grouped together with the values 

 for the waking hours of the subjects in the sleeping experiments, are given in 

 table 98. This grouping amplifies the list of subjects considerably, and we 

 have a somewhat better basis for a discussion of the variations in the type of 

 individuals. The average results at the foot of the table represent the results 

 obtained on 55 different subjects during waking hours and not the average of 

 the experiments in the table. The short fat men, group I, have, as a rule, a 

 considerably lower metabolism than any of the other classes, while the lean 

 men, group II, as a class have the highest metabolism. As in the preceding 

 table, certain individuals are here grouped under more than one head as, for 

 instance, H. L. W. and G. H. H. are classified under both lean men and short 

 men, and W. E. L. and F. L. T. under both lean men and tall men. Considering 

 the results on the basis of heat production, we find that group I is considerably 

 lower than normal, group II is considerably higher, and groups III and IV have 

 an average heat production not far from the normal. The carbon-dioxide pro- 

 duction and oxygen consumption are very low with the short fat men, somewhat 

 above the average with group II, and not far from the average with groups III 

 and IV. 



