24-HOUR ENERGY REQUIREMENTS. 



209 



Few of our experiments have included the entire 24 hours, and we 

 cite only two. Accordingly it is necessary for us to consider observa- 

 tions made in other laboratories. In practically all the experiments 

 in which 24-hour periods were possible, few if any were available for 

 comparison with our basal measurements, but they are of prime import- 

 ance for estimating the probable total 24-hour heat-output for very 

 young children. We have collected from the literature a number of 

 respiration-chamber experiments with children ranging in age from 

 1 hours to 9 months. These were practically all carried out with the 

 Pettenkofer-Voit type of apparatus and for the most part were made 

 in Berlin. The data for these experiments are given in table 37, in 

 which is recorded the heat-output of these children computed on the 

 basis of per kilogram per 24 hours. This corresponds very closely, 

 in all probability, to the actual heat production, but does not corre- 

 spond to the energy needs, since the amount required for growth is 

 not included. Finally, we have recorded the values for the basal heat 

 per kilogram per 24 hours, as predicted from the body-weight curve 



TABLE 37. Heat production per kilogram per 24 hours of normal boys studied by other 



investigators. 



1 See table 36, p. 206. 



2 Birk and Edelstein, Monatsschr. f. Kinderheilk., 1910-11, 9, p. 505. 

 4 Rubner and Heubner, Zeitschr. f. Biol., 1898, 36, p. 1. 



6 Niemann, Jahrb. f. Kinderheilk., 1911, 74, p. 22. 



6 Child had had light case of grippe and indigestion previously. 



' Hellesen, Nord. Med. Arkiv, 1915, 48, Nos. 14 and 18. 



8 Rubner and Heubner, Zeitschr. f. Biol., 1899, 38, p. 315. Girl. 



K" Rubner and Heubner, Zeitschr. f. exp. Pathol. u. Therapie, 1904-05, 1, p. 1. 



8 Without food. 



