Warming Up. 19 



lu the first curve (No. 3) it is seen thnt with G. the 

 curve falls quite steadily to the end. With G. and with 

 others it is found that this curve is as characteristic and uni- 

 form as their signatures. 



After the muscle was completely tired the weight was 

 removed (at line marked X) and a very light one put in its 

 place merely to keep the muscle active, for five minutes. 

 Then the same weight as used at first was replaced and the 

 second curve taken. In both of these cases, all of them in 

 fact that were tried on most of the subjects, there was not 

 room enough on the drum of the kymograph to record the 

 second curve and they were broken oif before there was any 

 evidence of fatigue. In one instance G.'s warmed up curve 

 with 600 grams was continued a long time and then additions 

 made until he was pulling 1.075 grams, which he raised to a 

 good height till stopped by the operator. He could not move 

 more than 800 grams before the warming up occurred. With 

 this snbject there was a feeling of mnscular exaltation that 

 made it a pleasure to lift the weight after the warming up 

 occurred. It was found that this was true after he said that 

 he was tired out and did not feel able to go through the ex- 

 periment. He noticed the same thing with studying. Others 

 have spoken of sitting down to study with a tired feeling 

 that almost persuaded them to give up the attempt, but be- 

 ginning to work that feeling disappeared and the best work 

 followed without fatigue for two hours or more. That looks 

 as if the first feeling of fatigue is a ruse of nature to get out 

 of work. It only indicates that the system is still building 

 up or in the anabolic state. One cannot, however, judge by 

 his feeling what his warmed up curve may be. All but one 

 of the subjects showed this warming up phenomenon. 



After marking the fact of warming up we attempted to 

 locate this increase of power. The first interesting point 

 noticed was that a general warming up, such as sparring, 

 running or general active exercise in the gymnasium pro- 

 duced the same warmed up condition of this small muscle, 

 which was not used at all or very slightly in the general 



