378 



THE HUMAN MOTOR 



therefore be supplemented by the data given in the following 

 table. The subjects of the experiments were men of good 

 physique. They walked many kilometres during a working day 

 of from seven to eight hours. No unloaded return journeys were 

 made, but, after each kilometre, there was a period of rest for 

 from 'two to five minutes, as also a rest of one or two minutes 

 every 600 metres. (The table is taken from the writer's work, 

 Le Rendement de la Machine Humaine, p. 72). 



The average expenditure per metre-kilogramme at speeds 

 between 4 and 5 km. per hour is -311 small calories for continuous 

 work under the above-mentioned conditions. The subjects of 

 the experiments were shepherds and agriculturalists of Northern 

 Africa. It is interesting to note that these men, who are used to 

 carrying heavy burdens, adopt the walk with bent knees previously 

 referred to. 



With the same type of subjects, tested on his experimental 

 bicycle ( 221) the writer obtained a nett efficiency of 32%. 

 The work corresponding to one pace can be calculated from the 

 above figures -311 small calories. An adult weighing 65 kg. 

 expends 65 X -311 small calories in traversing one metre. The 

 expenditure for a pace of -78 m. is therefore : 



65 X -311 X -78. 

 and the work done is : 



T = 65 X -311 X -78 x -325 X 425_= 2-18 kgm. 



