32 



Metabolism of Healthy Man. 



the measurements for oxygen as here determined are as accurate as those 

 ordinarily determined for residual amounts. 



The calorimeter measurements obtained during this experiment are given 

 in table 20. The}' require no special comment other than the statement that 

 the periods were not of equal length, and hence the figures in the last column 

 can not be compared with each other on this basis without recalculation. 

 Table 19. Record of oxygen Metabolism experiment No. 103. 



Table 20. Summary of calorimetric measurements and total heat production 



Metabolism experiment No. 103. 



Comparison of Results with Different Activities. 



Inasmuch as the periods were not of equal length, it is advisable in com- 

 paring the results of the katabolism during different periods to compute them 

 on the basis of 1 hour. These calculations have been made and the results 

 have been presented in table 21. During the period when the subject was 

 lying down, the amount of carbon dioxide excreted amounted to 33.1 grams 

 per hour. When he was sitting in the chair, it was somewhat less, 27.2 grams, 

 and when standing, it was slightly above the initial lying-down value. Similar 

 fluctuations are noted in the amounts of water vaporized and there is a similar 

 tendency for the oxygen absorbed, although the falling off during the period 

 of sitting is not so noticeable. The heat eliminated shows a gradual increase 

 during the three successive periods, but when the heat production is calculated, 

 making due allowance for changes in body-temperature and body-weight, it is 

 found that the heat production during lying down was actually greater than 

 during sitting, although less than during standing. 



In interpreting these results, it is important to note that the values for 

 lying down are probably slightly influenced by the digestion of the food taken 



