478 VITALITY AND EFFICIENCY WITH RESTRICTED DIET. 



continued. This, coupled with the striking fall previously noted in 

 practically all cases after the walking ceased, may be an actual indi- 

 cation of an effect of low diet upon the respiration rate. 



The absence of respiratory studies with Squad A under normal 

 conditions is much to be regretted. Although we obtained a larger 

 number of prewalking records than with Squad B, they are in large 

 part based upon but few respiratory cycles. Thus with Pea, Pec, and 

 Tom the count is based on 3 cycles each. We did obtain, however, a 

 fairly good record in all cases of standing after walking. 



In only 5 cases could the immediate transition from standing to 

 walking be considered, but in all these there is an increase, i. e., 4 with 

 Moy and Pec, 3 with Tom, and 2 with Gul and Vea. Continued walking 

 produced a slight increase with all of the subjects. In general the 

 counts subsequent to the sixth minute were remarkably uniform. There 

 was, therefore, with this squad a tendency for continued walking 

 to produce a slight increase in the respiratory rate. This is in accord- 

 ance with the general evidence presented by Squad B. That this 

 can hardly be due to the increment in carbon dioxide is, we believe, 

 proved by the experience with Squad B on January 6, prior to reduced 

 diet. It may thus be taken as probable that during walking with low 

 diet there is a slight tendency for the respiratory rate to increase some- 

 what. After the cessation of walking, and when the subject was still 

 standing upon the treadmill, the respiration counts in practically 

 every instance decreased, and noticeably so, the most striking instance 

 being that of Moy, whose respiration rate fell from 23 to 13. In a 

 certain sense this evidence substantiates the other evidence of the 

 experimental data for the increase from standing to walking, since the 

 reverse from walking to standing produced a fall in the respiratory 

 rhythm. The general tendency towards constancy in respiration 

 rate after the first 6 minutes of walking would imply that this transi- 

 tion takes place in the early part of walking and that the slightly faster 

 rate is maintained fairly uniform throughout the rest of the time of 

 walking. The uniformity in respiration rate after walking is very 

 clearly shown by the numerous records obtained for Gul and Vea 

 whose respiration rates were counted practically every 2 minutes 

 throughout the test, the rate remaining for the most part extraordi- 

 narily constant. 



MECHANICS OF RESPIRATION. 



In addition to the records of the respiration rate obtained in the 

 experiments with the respiratory-valve apparatus, data regarding the 

 total ventilation of the lungs per minute were also secured. From 

 these two a computation could be made of the volume per respira- 

 tion. Using the respiratory exchange, particularly the carbon- 



