Contents. vii 



Page. 

 Discussion of results Continued. 



Oxygen consumption 175 



Methods for determining the oxygen consumption 175 



Indirect method 175 



Direct method 175 



Earlier investigations 176 



Experiments on oxygen consumption 179 



Apparatus and methods used 179 



Oxygen consumption during sleep 179 



Comparison with other investigations on oxygen consumption 



during sleep 181 



Influence of previous muscular activity upon the oxygen con- 

 sumption during sleep 182 



Oxygen consumption during waking hours 183 



Ratio of oxygen consumption during sleep to that during waking 



hours 185 



Conclusions with regard to oxygen consumption 186 



Heat elimination and heat production 188 



Methods and apparatus for determining the heat elimination 188 



Heat production as compared with heat elimination 190 



Experiments on heat elimination and heat production 191 



Heat production during sleep 191 



Influence of previous muscular activity on heat production 



during sleep 192 



Heat production during waking hours in rest experiments 193 



Ratio of heat produced during sleep to heat produced during 



waking hours in rest experiments 195 



Proportion of total heat elimination required to vaporize water 



from lungs and skin 196 



During sleep and during waking hours in rest experiments. . 196 



During muscular work 197 



Energy given off by the body in different ways 200 



Relations between the various factors of metabolism 203 



Relation of carbon dioxide eliminated to water vaporized 203 



Respiratory quotient and calorific equivalents of carbon dioxide and 



oxygen 208 



Respiratory quotient as an index to the character of the metabo- 

 lism 210 



Calculated respiratory quotients and calorific equivalents of 

 carbon dioxide and oxygen for protein, fat, and carbo- 

 hydrate 210 



Respiratory quotients in metabolism experiments 212 



Relation between the oxygen consumption, the carbon-dioxide 



elimination, and the heat production 218 



Calorific equivalents of oxygen and carbon dioxide in metabo- 

 lism experiments 220 



Relation of external muscular work to carbon-dioxide elimina- 

 tion, oxygen consumption, and heat production 224 



Variations in metabolism due to variations in physical characteristics, 



age, and muscular activity 231 



Variations in metabolism due to weight, height, and age 231 



Influence of weight, height, and age on metabolism during sleep. . 232 

 Influence of weight, height, and age on metabolism during waking 



hours 234 



Comparison of the metabolism of athletes and non-athletes 236 



Comparison of the metabolism of women and non-athletes 238 



Variations in metabolism due to variations in muscular activity 241 



Comparison of the metabolism while lying awake with metabo- 

 lism during sleep 241 



