24 Fisher — Tlie Ejfect of Diet on Endurance. 



that it had been even possible in January to goad the men to do as 

 much in tests 1, 2 and 5 as they did without urging in June, they 

 must certainly have been ill. 



The following are statements from the men themselves : 



Personal Impressions at end of Experiment. 



(B) I was -"e?7/ sore [after the June test, Saturday, June 16, 1906]' 

 However, 1 think the soreness was not so severe or lasting as it was 

 after the January test. The muscles of my right arm were swollen 

 considerably and I Avas unable to straighten it for two or three 

 days. But the swelling was not so severe as it was after the 

 earlier test and the arm was much more usable. The muscles of the 

 thighs were the sorest ; they were nearly worn out. During Sunday, 

 Monday and Tuesday after the test I had difficulty in walking ; and 

 going down stairs Avas quite a difficult and severe undertaking. 

 Wednesday morning the soreness had not left, though it had de- 

 creased considerably. I took a considerable tramp that day, and by 

 night I coidd scarcely feel the soreness at all. By Thursday I had 

 practically regained my normal endurance ; walked six or seven 

 miles that day. The calf-muscles too Avere quite sore, but much less 

 so than after the January test. There was another particular dis- 

 tinction. After the earlier test the calf-muscles were hard and 

 knotted for several days ; but this time, Avhile they were sore, they 

 Avere almost normally soft. Saturday evening Avhen I Avent to bed 

 they Avere quite hard, but Sunday morning they AA'ere normal and 

 practically remained so. . . . 



I have no doubt that in my case there Avas great increase in 

 endurance, though I think that I lost in amount of energy that I 

 could exert at any given moment. This loss is due perhaps to two 

 things ; (1) I took, on the Avhole, less exercise than during the time 

 preceding the January test ; (2) I had been working quite hard for 

 three months steadily, Avhile the January test followed a three weeks' 

 vacation during which I did little or nothing. As to increase of 

 endurance there can be no doubt. ' For example, in the deep knee- 

 bending, I began to get tired at 50 and had no idea of going above 

 100. When I reached this I set my goal at 125, then 150, 160, and 

 was able to reach 200 before I was exhausted. In January', after I 

 Avas tired I Avas not able to go on very long before I became com- 

 pletely exhausted. This shows increased endurance. I had the 

 same experience in the other hard physical tests. In case of the run, 

 I Avas sure I could not go more than three laps after my iirst lap ; 



