278 



METABOLISM DURING WALKING. 



The data for the transitional changes in the respiration, pulmonary 

 ventilation, and oxygen consumption were secured by employing the 

 records of the kymograph according to the methods already described 

 in giving the results of the study on the effect of the mouthpiece upon 

 the same factors. (See p. 182.) A reproduction of two typical kymo- 

 graph records obtained in these transition periods is given in figure 38. 

 The lower record (A) represents the change from standing to grade 

 walking, and the upper record (B) the change from grade walking to 

 standing. The exact point when the change occurred is indicated 



.JVt HI 



B 



FIG. 38. Typical kymograph records of respiration, pulmonary ventilation, and 

 rate of oxygen consumption in periods of transition from standing to walk- 

 ing and the reverse. 



A, standing to walking. B, walking to standing. The arrows indicate the exact 

 point when change occurred. Records of time and pulmonary ventila- 

 tion adder above each kymograph tracing. 



in both cases by an arrow. The hill-and-valley effect due to the re- 

 filling of the spirometer with oxygen, and referred to on page 182, may 

 be noted in these records. 



RESPIRATORY CHANGES IN TRANSITION PROM STANDING TO GRADE WALKING. 



The observations of the changes due to transition from standing to 

 grade walking were made with the subject standing for 3 or more 

 minutes; the treadmill was then started, and the tracings on the kymo- 

 graph were noted as the subject walked. The data recorded in tables 



