CHARACTER OF KATABOLISM 
89 
and a marked fall in the subsequent rest-period. It might be argued that the 
results for January 18 and 19 appear to show that there were no alterations 
in the character of the metabolism during work, since the quotient of 0.77 
before work was followed by a quotient of 0.74 during work, and 0.70 to 0.71 
after work. It should be pointed out, however, that the work performed on 
those days (see table 93) was relatively smaller than it was on February 
7, 8, and 9. It is obvious that here we deal with the nutritive plane of the 
body. To be ideal, therefore, a series of experiments should include the die- 
tetic control of the subject over a considerable period of time. 
SUBSIDIARY EVIDENCE WITH REGARD TO THE EFFECT OF MUSCULAR WORK ON THE CHARAC- 
TER OF THE KATABOLISM. 
The experiments included in tables 92, 93, and 94 were made primarily 
in order to study the effect of severe muscular work on the respiratory quo- 
tient, but we have a considerable amount of fragmentary evidence which 
bears upon this point that was secured in connection with experiments 
made for a different purpose, namely, to study the efficiency of the body as a 
machine. So far as this discussion is concerned, these experiments were in- 
complete in that one or both of the rest-periods were lacking, but we deem the 
results of sufficient importance to discuss in this connection. 
In 7 of these experiments the respiratory quotient was not determined 
after the muscular work was performed, although it was secured prior to the 
work-period. The results of these experiments are given in table 95. Since 
Table 95. — Respiratory quotients in experiments without food with subject M. A. M., before 
work (lying on couch) and during work. 
[Figures in light-face type represent accumulated work to end of period expressed in calories.] 
Date. 
Calories 
per minute 
during 
period. 1 
Respiratory quotient. 
Date. 
Calories 
per minute 
during 
period. 1 
Respiratory quotient. 
0.87 
41 
68 
0.94 
1.00 
0.83 
0.98 
0.87 
51 
91 
0.90 
093 
0.84 
58 
100 
139 
0.90 
0.93 
1.00 
167 
192 
227 
0.88 
0.83 
0.83 
1911. 
Dec. 19 
Dec. 14 
1912. 
Feb. 27 
Feb. 26 
Lying 
Work, 1. 00 » 
Lying 
Work, 1.20 
1.00 
Lying 
Work, 1.20 
1.90 
Lying 
Work, 1.30 
1.90 
0.84 
27 
0.85 
0.91 
61 
92 
81 
0.97 
0.88 
40 
0.82 
134 
0.97 
0.84 
38 
1 05 
135 
0.94 
50 
0.86 
63 
0.84 
170 
0.93 
63 
0.80 
183 
0.90 
84 
0.89 
205 
0.97 
87 
0.87 
1912. 
Feb. 23 
Mar. 11 
Feb. 29 
Lying .... 
Work, 1.30 
1.90 
2.10 
Lying 
Work, 2.10' 
Lying 
Work, 2.10 
1.30 
1 Approximate. 
1 In the interval between the periods lying before and the first work-period, the subject rode without load 
and without motor for 1J hours. 
3 In the interval between the periods lying before work and the first work-period, the subject sat inactive 
on the ergometer an hour and then rode without load for an hour on the motor-driven ergometer. 
there was a suggestion in some of the earlier tables that the intensity of the 
work, as well as the total amount performed, played an important role in the 
character of the katabolism, in this and in subsequent tables the intensity of 
