WORK PRODUCTION 



553 



656. Summary. The following table contains a summary 

 of Zuntz and Hagemann's results regarding the efficiency of 

 the body of the horse as a motor. As is apparent from the 

 foregoing explanations, the table shows the net efficiency in 

 the various forms of work into which the total work done can 

 be separated in the manner just described (651, 654). 



TABLE 155. NET EFFICIENCY OF THE HORSE IN DIFFERENT FORMS OF 



WORK 



657. Relative utilization of fats and carbohydrates. In 

 view of Chauveau's theory 4 that fat must first be converted 

 into dextrose, with the elimination as heat of a considerable 

 portion of its energy, before it can serve directly as a source of 

 energy for the physiological processes, it becomes of much in- 

 terest to inquire to what relative extent the energy of fats and 

 carbohydrates is utilized in muscular work. 



In Zuntz and Hagemann's extensive investigations, particularly 

 in those upon the horse, there were very considerable variations 

 in the proportions of fat and carbohydrates katabolized. The 

 individual trials in which the same kind of work was per- 



1 Single experiment. 2 Two experiments. Work probably excessive. 



3 Independent of speed. 



4 Compare Armsby, Principles of Animal Nutrition, pp. 153-154 and 399-405. 



