DISCUSSION OF RESULTS. 



95 



April 28 and April 29. Nevertheless, there is no definitely uniform 

 influence of prolonged walking upon the efficiency for horizontal 

 movement shown by this subject and the heat per unit of work after he 

 had walked 20 kilometers is as liable to be lower than the initial value 

 as it is to be higher. In other words, in this series of experiments, the 

 measured metabolism agrees perfectly with the subjective impression 

 that there was not a sufficient degree of fatigue to affect the comfort 



TABLE 18. Heat-output per unit of work during prolonged walking in experiments with subject II . 



x For total distance walked, see table 4, pp. 56 to 60. 



2 Calculated for each period from the increment above values obtained with the subject standing 

 relaxed. See tables 14 and 16, pp. 83 and 88. 



of the subject or his metabolism and that at the' speed used throughout 

 these tests, namely, 80 meters per minute, walking may be done for 

 many kilometers without affecting the efficiency of the body for loco- 

 motion in a forward direction. 



The stamina of the subject and his capacity for excessive work was 

 severely tested in the earlier research on prolonged bicycle riding, in 



