146 



METABOLISM DURING WALKING. 



group for 65 to 70 meters were taken from experiments in the following 

 months of November and December, when the effect of training had 

 become apparent. This single exception to the effect of increase of 

 speed gives evidence, therefore, of the effect of training in reducing the 

 energy requirement. 



EFFECT OF SPEED UPON TOTAL INCREASE IN HEAT-OUTPUT. 



The energy-output over the standing requirement likewise increases 

 with the increase in speed in much the same manner as was found with 

 the total heat-output. This may be seen in the next to the last column 

 of table 35 and graphically in figure 10. The high values for E. D. B. 

 at 60 to 65 meters per minute, most of which were obtained early in the 



TABLE 36. Percentage increase in heat-output of E. D. B. due to walking 

 on a level at various speeds. (Values per minute.) 



FIG. 10. Increments in total heat-output over standing re- 

 quirement for subjects walking on a level at different 

 rates in meters per minute, with percentage increase 

 (broken line) for E. D. B. 



