METABOLISM WITH GRADE WALKING. 



235 



amount of work due to faster walking on a 10 per cent grade it would 

 be 6.08 calories. This characteristic was also apparent from the rela- 

 tive positions of the curves for the total carbon dioxide and oxygen 

 for both W. K. and E. D. B., given in figures 16 to 19. While most 

 of the curves for the heat-output of E. D. B. show this same relation- 

 ship between the heat produced for a definite amount of kilogrammeters 

 of work with different grades, the curve for th? 35 per cent grade and^a 

 part of the curve for the 25 per cent grade, as well as the two points for 

 the 45 per cent grade, indicate a higher heat-output than is found for 

 the same number of kilogrammeters of work on the curve for the next 

 lower grade. These exceptions were also found with the oxygen 

 curves, as discussed on page 228. 



TABLE 61. Minimum and maximum heat-output in grade walking 

 during experiments without food. (Values per minute.) 



TABLE 62. Comparison for E. D. B. of total heat-output per kilogrammeter of work 

 in grade walking with increasing amounts of work. (Values per minute.) 



The minimum and maximum daily averages for the total heat-output 

 of H. R. R., T. H. H., W. K., and E. D. B., together with the amount of 

 work done on these days, are given in table 61. For comparison, the 

 total heat-output per kilogrammeter of vertical grade-lift, or the total 

 energy cost for 1 kg. m. of work done in the elevation of the body, has 

 also been calculated for these days and included in the table. As the 



