288 



METABOLISM DURING WALKING. 



then had a preliminary walk in order to make the conditions as 

 nearly alike as possible. 



CHANGES IN RESPIBATION-RATE. 



The respiration-rates during the walking periods show variations in 

 the measurements per minute, but, on the whole, indicate what may be 

 accepted as the average for walking in each period. A comparison 

 of these rates with those obtained immediately after walking ceased 

 shows that the respiration-rate falls during the first 12 seconds of stand- 

 ing in all but three instances, i. e., February 14 and 15, and the second 

 period of March 10. The decline is small in some cases, and none of 

 the decreases exceed the rate of 6.5 respirations per minute, while the 

 rate for the majority is less than 4 respirations per minute. In the suc- 

 ceeding fractions of the first minute the records show increases and 

 decreases without uniformity, although by the end of the minute the 

 rates may possibly be said to be lower on the whole than at the begin- 

 ning of the standing. The notable fact is that the change in respira- 

 tion-rate is slight in the transition from walking to standing. Further- 

 more, if 16 respirations per minute be taken as the normal respiration- 

 rate for E. D. B. in the standing position, we find that in one or two 

 instances this value is approached during the second or third minute 

 after walking ceased, but the rate is not maintained. In nearly every 

 case the rate is above the normal standing value during the fifth min- 

 ute, while most of those records which extend into the seventh and 

 eighth minutes show that the respiration-rate is still above the normal. 

 This course is in contrast to the behavior of the respiration-rate in the 

 transition from standing to walking, for the response under those con- 

 ditions was largely within the first 12 seconds and a uniform rate had 

 been attained by the end of the first minute of walking. 



TABLE 83. Respiration-rate and pulmonary ventilation of E. D. B. in periods of transition 

 from grade walking to standing. (Values per minute.) 



