176 



METABOLISM DURING WALKING. 



the point of minimum value at 10 seconds. Although the readings can 

 not be said to be the blood-pressures during horizontal walking, it 

 is believed that they approach closely to them, and as the conditions 

 under which the readings were made were alike, the results are com- 

 parable. 



Disregarding the fact that there was some variation in the speed of 

 walking for the periods on the same day, it is seen in table lla that the 

 blood-pressure shows but little tendency to change from period to 

 period on the same day, the difference being 2 mm., with an extreme 

 of 4 mm. on two occasions. 



For a comparison between the average standing and the average 

 walking blood-pressures on the same date, a summary is presented in 

 table 48. The blood-pressure for the first walking-periods is here seen 

 to be 5 to 16 mm. higher than the average standing values for the same 

 day. The average increase is 9 mm. 



TABLE 48. Summary of blood-pressure records for E. D. B. in horizontal-walking experi- 

 ments without food. 



The degree of increase over the standing does not show an evident 

 connection with the speed, nor does the speed of walking show a uni- 

 form effect upon the absolute blood-pressure readings until the rate of 

 88.3 meters per minute is reached. At this point the blood-pressure 

 is noticeably higher than for the more moderate speeds. The average 

 blood-pressure for the horizontal-walking experiments on the days 

 when the speed was 75.9 meters per minute or below was 122 mm., and 

 ranged from 118 to 126 mm. Above 75.9 meters per minute it was 

 129 mm., ranging from 125 to 131 mm. 



