40 
MUSCULAR WORK 
NO-LOAD EXPERIMENTS. 
These experiments (see tables 16 to 22 inclusive) were made to deter- 
mine the metabolism incidental to revolving the pedals and other extraneous 
activity in riding the ergometer and the overcoming of the slight friction of 
the apparatus. The grouping includes both the experiments in which the mo- 
tor was used to revolve the pedals, and those in which the motor was not used. 
In the motor experiments, the subject sat in the usual position for riding, 
but was supposed to exert no pressure upon the pedals, which were revolved 
by a small motor. Only ergometer II was used in this series of experiments. 
In the experiments without motor, the subject revolved the pedals, but 
no current was passed through the magnetizing field. Both ergometer I and 
ergometer II were used for these experiments. 
The subjects found these "no-load" experiments irksome, and had con- 
siderable difficulty in maintaining an even rate of revolution without involun- 
tarily regulating the motion of the pedals by "back-pedaling" or "racing." 
Table 16 — 
Results with subject M. A. M. (without food). (Ergometer I.) 
Date and time. 
Duration. 
Carbon 
dioxide 
eliminated 
per minute. 
Oxygen 
absorbed 
per minute. 
Respira- 
tory 
quotient. 
Average 
pulse- 
rate. 
Average 
respira- 
tion-rate. 
Revolu- 
tions per 
minute 
Dec. 13, 1911. 
Lying: 
8>> 33 m a.m.i 
9 22 a.m 
No load, without motor: 
10 h 12"> a.m. 2 
10 32 a.m.' 
10 51 a.m.« 
min. sec. 
14 34 
14 38 
14 51 
10 30 
11 03 
11 55 
c.c. 
200 
196 
203 
533 
703 
609 
c.c. 
226 
222 
231 
717 
783 
734 
0.89 
.88 
.88 
.75 
.90 
.83 
64 
62 
62 
85 
89 
92 
24 
25 
24 
23 
24 
28 
83 
87 
83 
1 The subject felt exhausted from the unseasonable heat. He lay down at 8 h 05™ a.m. The pulse-rate at 
8 h 05 m a.m. was 76; at 8 h 10™ a.m., 68: at 8 h 15 m a.m., 66; at 8 h 22"> a.m., 8 h 27 m a.m., and 8 h 33 m a.m., 
64. 
2 The subject began riding "no load" at 9 h 44 m a.m. Put mouth to the mouthpiece at 9 h 59 m a.m. The 
pulse-rate between 9 h 46™ a.m. and 10 h 09™ a.m. ranged from 82 to 86, the average being 84. The 
average speed during the preliminary period was about 76 revolutions per minute. The subject was 
driving the machine without resistance. 
* In the interval before this period the average speed was about 78 per minute. During the period the sub- 
ject looked cool and not at all distressed. He lost the pedals once or twice. He began to look warm 
and perspiring toward the end of the period. 
* In the interval before this period the average speed was 82 per minute. The subject complained of saddle 
soreness due to the position. He felt the lack of toe-clips. Respiration was more rapid. Perspira- 
tion appeared in beads on his upper lip. There was no flushing, however. 
Table 17.— 
Results with subject M. A. M. 
(without food) . 
(Ergometer I.) 
Date and time. 
Duration. 
Carbon 
dioxide 
eliminated 
per minute. 
Oxygen 
absorbed 
per 
minute. 
Respira- 
tory 
quotient. 
Aver- 
age 
pulse- 
rate. 
Average 
respira- 
tion-rate. 
Cur- 
rent. 
Revolu- 
tions per 
minute. 1 
Dec. 19,1911. 
Lying: 
No load, without motor: 
9 h 57m a . m .s 
10 19 a.m.» 
Work: 
lib 12m a . m .4 
11 34 a.m 
min. sec. 
15 36 
14 29 
15 03 
13 22 
13 20 
13 25 
10 24 
10 27 
c.c. 
204 
200 
196 
420 
385 
388 
1,017 
1,077 
c.c. 
235 
250 
229 
473 
444 
443 
1,206 
1,246 
0.87 
.80 
.86 
.89 
.87 
.88 
.85 
.86 
63 
64 
63 
86 
86 
86 
118 
126 
20 
20 
20 
20 
20 
20 
23 
23 
amp. 
0.9 
0.9 
60 
60 
60 
60 
60 
1 Approximate. 
2 The subject sat on the ergometer at 9 h 40 m a.m. and began riding. The metronome was used, set at 60 per 
minute. The counter was not used. The pulse-rate averaged about 84 during the preliminary riding. 
8 The subject rode very easily. He said the lack of resistance was rather disagreeable. _ 
i The metronome was used, set at 60. Current was on at 10 h 57 m a.m. The pulse-rate during the preliminary 
work was 100, 104, and 106. The mouth was put to the mouthpiece at ll h 07 m a.m. The work was 
comparatively easy. No marked perspiration or flushing. The subject, however, found it very hard 
after coasting. 
