468 VITALITY AND EFFICIENCY WITH RESTRICTED DIET. 



for the first minute of walking, over the level of the standing pulse, 

 than the men on normal diet did. Following the bicycle riding it 

 seems that the increase occasioned by the riding was sHghtly greater 

 for normal than for reduced diet subjects; the only difference was that 

 with the latter men there was a tendency to a quicker return to the 

 normal base line. All in all, therefore, it seems that the pulse for the 

 reduced diet condition demonstrates this difference, i. e., a lowering 

 in the level without discoverable modification in the functional effi- 

 ciency of the heart rate to meet the needs of the circulation of the 

 organism under the varying conditions of rest and activity. 



RESPIRATION RATE. 



Throughout the entire series of experiments with both the portable 

 respiration apparatus and the respiratory-valve apparatus, the respi- 

 ration rate was obtained graphically by means of a pneumograph 

 placed around the chest of the subject. Certain respiration rates were 

 likewise determined on the morning of the standing respiration experi- 

 ments prior to walking by noting the rise and fall of the spirometer 

 bell. These were counted in definite periods of time and were recorded 

 by the observer. All the respiration rates observed in this series of exper- 

 iments were obtained when the subject was attached to some form of 

 breathing appliance. With the portable respiration apparatus, for 

 both the lying and the standing positions, the regulation mouth- 

 piece and nose-clip were used. With the respiratory-valve apparatus 

 a mask was attached to the face; with this, in all probability, a more 

 normal respiration was obtained. Although it was the opinion of 

 the observers that relatively slight, if any, changes in respiration 

 rate were apparent throughout the entire series of tests, we have had 

 all these records carefully inspected and counted and the values 

 obtained on the different mornings are presented in table 108. Since 

 the respiration rate likewise has specific value in the computation of 

 the alveolar air and the amount of air expired per respiration, certain 

 respiration rates also appear in table 111. (See p. 480.) 



COURSE OF RESPIRATION RATE WITH REDUCED DIET. 



Making due allowance for the novelty of the experiment and the 

 necessity for getting used to the breathing-appliance attachment in 

 the first few days, namely, during the normal diet, no striking dif- 

 ference between the rate with normal diet and that in the first few 

 days of reduced diet can be observed in the majority of instances. 

 As the research progressed, however, it can be seen that there was a 

 distinct tendency with a number of the subjects, especially towards 

 the end, for the respiration rate to decrease somewhat. Thus with 

 Bro we find a tendency for the level to be somewhat above 13 respira- 

 tions per minute in the early part of the experiment, but during the 



