540 VITALITY AND EFFICIENCY WITH RESTRICTED DIET. 



but 12 individual experiments with 12 different men. The fact that 

 their average value is somewhat higher than that found by another 

 technique with 8 other subjects, and which represented a large number 

 of series, is not to be given undue prominence. 



WALKING EXPERIMENTS WITH REDUCED DIET, SQUAD B. 



Two days after the experiments on January 6 were made with 

 Squad B the reduction in diet previously discussed was begun and 

 continued for 20 days. On January 28, the last day of restricted 

 diet, a second series of tests was made. These duplicated in every 

 respect those of January 6, with the exception that McM had been 

 obliged to leave the squad and Lon had returned. 



The metabolism of the men as measured while standing, preliminary 

 to walking, appears in table 136. From tables 138 and 140, we find 

 that the average heat production per minute of the 12 subjects fell from 

 1.37 calories on January 6 to 1.10 calories on January 28, or a decrease 

 in the heat output from the body of 19.7 per cent. The averages are 

 unaffected by including the values found with McM and Lon. 



A summary of the gaseous metabolism and computed heat output 

 for the walking experiments of January 28 is given in table 140. 

 Here, also, the average rate of walking remained constant in all experi- 

 ments, again attesting to the uniformity in action of the mill. The 

 respiratory quotients, except that for Wil, which is -relatively high, 

 are fairly uniform and are of the usual value. The total heat output 

 bears a reasonable relationship to the body-weight of the subject. 

 Special attention is called to the values for the total heat required for 

 walking 10 km., i. e., the average day's walking performance. The 

 average for the entire squad is 533 calories. These values in the last 

 column may be compared to the corresponding values on January 6 

 for normal diet. The total heat increase above standing is of special 

 significance, but attention must also be called to the heat requirement 

 for transporting 1 kg. 1 meter (column k). Here the values range from 

 0.493 with Tho to a maximum of 0.652 with Har. The average value 

 is 0.562. The range in values in this series of experiments is very 

 much less than that in the earlier series, in which it will be recalled 

 that the values ranged from 0.479 to 0.745. A comparison of the 

 average values may be made best in connection with the comparison 

 of all the several factors. 



COMPARISON OF THE GASEOUS METABOLISM OF SQUAD B ON RESTRICTED 

 DIET WITH THAT ON NORMAL DIET. 



Having considered the details of the metabolism experiments as 

 recorded at the end of the 20 days of restricted diet, we are in a posi- 

 tion to compare all the physiological activities and metabolic condi- 

 tions with the normal period prior to dietetic restriction and to note 

 the influence, if any, of the diet restriction. For this purpose we have 



