METABOLISM WITH GRADE WALKING. 



237 



o, 



FIG. 24. Total oxygen consumption and heat-production of E. D. B., 

 referred to kilogrammeters of work performed in grade walking. (Val- 

 ues per minute from table 56.) 



requirement of E. D. B., as was done in considering the curve for the 

 oxygen consumption given in the same figure (see p. 228), we find his 

 requirement for maintenance, horizontal component, step-lift, etc., 

 to be 2.00 calories, and superimposed on this is the average requirement 

 of 8.7 gram-calories for each kilogrammeter of work due to grade-lift. 

 Since the curve for W. K. is not linear throughout, no definite estimate 

 can be made for his basal requirement, but the slope of the line above 

 400 kg. m. would indicate that the requirement for each kilogrammeter 

 of work due to grade-lift was 10.5 gram-calories. 



The total heat-output as estimated from the curves in figures 23 

 and 24 for increasing amounts of work, also the increase over the stand- 

 ing requiremenbs due to the work performed, are recorded in tables 63 

 and 64. It is seen in comparing these sets of figures, as was done with 

 tables 58 and 59, that of the two subjects W. K. spent the larger amount 

 of heat over the standing requirement for a given amount of work, and 

 also that the heat expended per unit of 100 kg. m. in excess of the 

 standing requirement was greater for small than for large amounts of 

 work. In both cases the increment in the heat per 100 kg. m. decreased 

 rapidly, approximating a value of 1.10 calories for W. K. and 0.96 cal- 

 orie for E. D. B. for 800 to 900 kg. m., while for 1,500 to 1,600 kg. m. 

 the value for E. D. B. was slightly less, i. e., 0.92 calorie. 



