EXPERIMENTS WITH HORIZONTAL WALKING. 



145 



TABLE 35. Metabolism during horizontal walking in experiments without food, grouped 

 according to speed of walking. (Average values per minute.) Continued. 



*5 periods. 



*10 periods. 



a 6 periods. 



4 4 periods. 



5 9 periods. 

 8 12 periods. 

 7 19 periods. 



8 8 periods. 



9 3 periods. 

 10 18 periods. 

 11 14 periods. 

 12 28 periods. 



13 7 periods. 



14 1 period. 

 15 25 periods.. 

 18 31 periods. 



17 2 periods. 

 18 17 periods. 



EFFECT OF SPEED UPON TOTAL HEAT-OUTPUT. 



Considering first the total heat-output, we find in all cases an increase 

 with each increase in speed, with the single exception of E. D. B. with 

 a speed of 65 to 70 meters per minute. This exception is due rather 

 to the excessive heat-output for the preceding group of values at 60 

 to 65 meters per minute. Two-thirds of the values at the latter speed 

 were obtained during the early part of this subject's experience with 

 the treadmill, namely, hi October, while nearly all of the periods in the 



