106 



METABOLISM DURING WALKING. 



value is included in the total average of 10.6 liters per minute for this 

 subject. In the two days that H. M. S. served as subject, the ventila- 

 tion varied from 9.9 to 10.3 liters per minute, with an average of 10 

 liters per minute. 



In looking over the figures for pulmonary ventilation, it is evident 

 that there is a possibility of considerable variation in this factor, not 

 only from day to day but from period to period. This variation makes 

 it difficult to state definitely whether or not training on the apparatus 

 has any influence in the volume of air inhaled into the lungs. The 

 most definite information on this point is found with E. D. B., with 

 whom during the second fortnight there was an average increase of 0.7 

 liter over the ventilation in the preceding 10 days, while for the re- 

 mainder of the season, a period of approximately 6 months, the dif- 

 ference was not more than 0.3 liter. The fact that the use of the by- 

 pass was omitted in the later standing experiments with W. K. prevents 

 any definite conclusion on this point from his data, while the experiments 

 with the other subjects were too few to throw light on the point under 

 discussion. 



When the average pulmonary ventilation per minute of these men is 

 compared on the basis of nude weight, it is found that the ventilation 

 of the lungs is not directly conditioned by this factor. That a con- 

 siderable variation in the ventilation per kilogram of body-weight is 

 possible is seen by the comparison made in table 24. Subsequent 

 research must take into consideration vital capacity 1 as well as 

 pulmonary ventilation. 



TABLE 24. Average lung ventilation per kilogram of body-weight with subject standing. 



(Values per minute.) 



PULSE-RATE WITH SUBJECT STANDING. 



The oscillograph for securing electro-cardiograms was not in a satis- 

 factory working condition until the middle of March 1915, and the 



Greyer, Lancet, 1919, 197, p. 227; ibid., 1920, 199, p. 289. Dreyer and Hanson, The assess- 

 ment of physical fitness by correlation of vital capacity and certain measurements of the 

 body, London, 1920. 



