26 



Metabolism of Healthy Man. 



Oxygen Consumed. 

 This experiment was one of the first metabolism experiments in which the 

 determination of oxygen was reasonably satisfactory. Subsequent experiments 

 have greatly improved the technique and accuracy. The method of computing 

 the oxygen has been explained in detail elsewhere/ The total amount of 

 oxygen consumed in each period is given in the sixth column of table 10. The 

 largest amount is during the period from 7 a. m. to 1 p. m., corresponding to 

 the increased muscular activity involved in the weighings. During the remain- 

 ing periods, the amounts are more constant for the respective conditions of 

 awake and sleeping. 



Table 10. Water vaporized, carbon dioxide exhaled, and oxygen consumed 



Metabolism experiment No. 102. 



HEAT ELIMINATION AND PEODUCTION. 



Of all the subjects formerly used in this respiration apparatus, none had 

 been of the same type of build as this subject, who presented a distinctly 

 large proportion of adipose tissue; hence the heat production of this subject 

 is of unusual interest. The electrical-resistance thermometer was not at that 

 time in use to determine the body-temperatures, and therefore we have only the 

 records at the beginning and end of the last 24 hours, which indicate that 

 there was no change in body-temperature from 7 a. m. on April 17 to 7 a. m. 

 April 18. Consequently, the heat production can not be computed for the 

 shorter periods. The total heat elimination, however, has been computed for 

 these periods, and is given in table 11. It should be noted that the correction 

 for the heat in bed and bedding is made during the first period in the morning 

 and during the period from 7 p. m. to 1 a. m. As with the carbon-dioxide and 

 water eliminations, the total heat elimination is largest from 7 a. m. to 1 p. m., 

 due to the excessive muscular exercise of this period, and lowest during the 



1 Atwater and Benedict, Carnegie Institution of Washington Publication No. 42; 

 Benedict, ibid., Publication No. 77. 



