VI CONTENTS 
PAGE 
The unit of efficiency 112 
Gross and net efficiency 112 
Methods of computing the net efficiency 113 
Comparison of basal metabolism in bicycle ergometer experiments 115 
Increment in metabolism due to changing from a lying to a sitting position . 115 
Increment in metabolism due to a change in position from lying on a couch to 
sitting on a motor-driven ergometer 117 
Increment in metabolism due to a change in position from lying on a couch to 
riding on an ergometer with no load and no motor 118 
Increment in metabolism in no-load experiments due to a change from a motor- 
driven ergometer to riding without motor 120 
Gross and net efficiency of subjects in respiration experiments with the bicycle 
ergometer 121 
Efficiency in work experiments based on values obtained in experiments with 
the subject sitting on the bicycle ergometer 126 
Efficiency in work experiments based on values obtained in no-load experiments 
without motor 128 
Efficiency in work experiments based on values obtained in no-load experiments 
with a motor-driven ergometer 130 
Efficiency in work experiments based on values obtained with a current of 0.5 
ampere 131 
Efficiency in work experiments based upon values obtained with a current of 
0.95 ampere 135 
General consideration of the experimental data obtained with the professional 
subject, M. A. M 136 
Relationships between speed and efficiency 138 
Comparison of the efficiency in the earlier and later experiments with the 
ergometer 143 
Relationship between efficiency and the character of the diet 145 
Physiological effects of muscular work 147 
Mechanics of respiration 147 
Ventilation of the lungs as affected by muscular work 147 
Carbon-dioxide content of the alveolar air after muscular work 149 
Collapse from excess of carbon dioxide in the ventilating current 150 
Pulse-rate 153 
Body-temperature 157 
The maximum working capacity of man 160 
The after-effects of muscular work . 163 
An attempted analysis of the components of the total energy transformations 
incidental to severe muscular work 173 
