Validity of Ergograph as Measurer of Work Capacity 45 



production of the same. The less number of contractions which 

 is possible in lifting a heavier weight will therefore mean a less 

 degree of cell exhaustion and a more rapid generation of waste 

 products. . The lifting of the heavier weight requires a greater 

 force of contraction in the muscle, and this is dependent upon 

 more vigorous innervation from the nerve -centers. The paraly- 

 sis of the muscles when exhaustion comes will result from the 

 accumulation of the waste products in the nerve center. The 

 recovery that comes from the removal of waste products during 

 the pause will be more rapid than through the reconstruction of 

 the cells which must be necessary after an exercise in endurance. 

 Although the figures showing the heights of contraction have 

 not been preserved, about the same degree of perfection of skill 

 was shown in lifting the larger weight as in lifting the smaller, 

 so that the larger weight affects the acquired endurance mostly. 

 Since the second pause has proved proportionately more effi- 

 cient as a rest period than the first, a series of observations were 

 made with the intention of determining what might be the 

 influence of a one-minute and a two-minute pause in a series of 

 fatigue curves. The number of curves that were possible within 

 the limits of our apparatus was six for the one-minute pause for 

 both right and left hands, and three for the right hand with two- 

 minute pause, and four for the left hand with a two-minute 

 pause. M. alone made observations upon this point. The ob- 

 servations were equally divided between "exhaustion" and "not 

 exhaustion," and the figures given in the following table are the 

 averages of four records: 



I23 



