22 FtsJier — I'lu Ejf'ect of Diet on Ev durance. 



left after the June tests as compared with the Janiiar}' tests indicates 

 that the June tests, in si)ite of being far more severe, fatigued the 

 men less. 



The 50-lb. dumb-bell test resolved the last doubts in my own mind 

 whether, for some of the men, the recorded results might not exag- 

 gerate the true improvement. The two men of whose records I 

 should have felt a little doubt were B. and R. Both of them came 

 to the June test after prolonged mental exertion, and their exhaustion 

 at the end was far more evident than that of any of the others. That it 

 was great is clear from their own statements given below, though 

 onh^ R. reported himself as having been about as stiff and sore after 

 the June as after the January tests. But both B. and R., whereas 

 they had less strength (Table X) before the June endurance tests 

 than before the January tests, had more strength left (Table XII) 

 after the June tests than after the January tests. At the close of 

 the January tests they were so exhausted that B. could not raise 

 the 50-lb. dumb-bell at all and R. could raise it onl}- 4 times. Had 

 their exhaustion after the June tests been as great, it seems certain 

 that B. would still have been unable to raise it, and R, would have 

 been unable to raise it more than 4 times ; but as it was, B. raised 

 it once and R. 10 times. 



The value of such a positive proof that the June tests were more 

 easily endured than those of January was not perceived until the 

 figures were analj^zed. Had it occurred to me in time, all the strength 

 tests taken before the endurance tests would have been repeated after 

 them. It is true that the strength tests at the beginning were not 

 of the same muscles as those (the biceps) used in the strength test by 

 dumb-bells at the end, but, as Table X shows, the strengths of different 

 muscles for the most part vary in unison wnth each other.' 



It is significant that the ox^y ^ii^^i whose. strength, as shown by the 

 above table, was less at the close of the June experiuient than at the 

 close of the January experiment was E., who was also the onl^^ man 

 whose endurance showed any reduction. The facts, therefore, in his 

 case are not discordant with those already stated ; for, as has been 

 stated, E.was the least assiduous in following the experiment. This was 



' Out of the 108 comparisons of strength (i. e. , comparisons for each of nine 

 men in each of four tests for January vs. March, March vs. June, and January 

 vs. June), only 20 are discordant with the general trend as shown by the totals. 

 Thus, for B. the general trend between March and June as shown by the total 

 was downward, and this downward trend is found in all but one of his four tests 

 the discordant case being the "back lift." 



