1G4 



MOVEMENT 



influenced by the rate of progression. Thus, during 

 slow walking, the energy expended in vertical oscilla- 

 tions is relatively greater than when the velocity of 

 horizontal translation is increased ; in rapid running, 

 the reverse is the case. It is necessary, then, to 



\U> K5 jjo 



4b 4f 50 55 60 65 JO ]5 60 b5 HO 95 -100 -105 -no 



Fro. 108.— Variations in the vertical oscillations of the body in walking and in running. 

 The rate of step varies bptween 40 and 130 per minute. Comparison between the 

 curve of oscillation and that of the length of stride. 



component factors of the work undergo when under 

 the influence of a gradual acceleration. 



In order that these variations might be clearly un- 

 derstood, they have been represented (Fig. 109) in a 

 graphic form. In constructing these curves, the num- 

 ber of steps executed in a minute has been numbered 

 off on the abscissa. The corresponding ordinates were 

 made proportional in length to the sum of all the factors 



This subject deserves re-investigation. It would be interesting to 

 discover whether tendons in man possess this valuable property to any 

 noticeable degree, and, if so, whether it id retained throughout life. 



