The following conclusions were drawn from this activity study with one subject: 1. The Kofranyi-Michaelis apparatus may be successfully used with children if it is worn on the back of an adult beside the child. 2. More than one test should be used to establish the energy value for a particular activity with one child. 3. Basal metabolism tests should be made near the time that activity studies are to be made. 4. The actual protein content of the diet should be known and used in the Weir formula for accurate energy determinations. 5. Energy expenditure studies are expensive in terms of time, equipment, techniques to be mastered, and the number of personnel required. The conclusions that were drawn in developing the methods used for this study are: 1. It is desirable to have the stand designed for the Haldane-Henderson glassware from Arthur H. Thomas Company to permit proper alignment and closer readings from the carbon dioxide absorber. 2. That enough sampling bottles be available to hold duplicate samples from bladders made in two different activities it the Haldane-Henderson method or gas analysis is used. / Master of Science