136 
MUSCULAR WORK 
rived from individual periods and they are consequently liable to all the pos- 
sible errors in individual experimentation, the agreement is on the whole 
remarkably satisfactory. 
Table 123. — Efficiency in respiration experiments with bicycle ergometer with a current of 
1.5 amperes. Subject, M. A.M. 
[Basal values obtained in experiments with current of 0.95 ampere.] 
Date. 
Oxygen intake 
per minute 
during work. 
Heat output per minute 
during work. 
Revolutions 
per minute. 
Heat equivalent of ex- 
ternal work per minute. 
(ft) 
Effi- 
ciency. 
J'XIOO 
(a) 
Cur- 
rent 
1.5 
amp. 
Cur- 
rent 
0.95 
amp. 
(c) 
Cur- 
rent 
1.5 
amp. 
W) 
Cur- 
rent 
0.95 
amp. 
(e) 
Increase 
over 
work at 
0.95 
amp. 
c—d 
(/) 
Cur- 
rent 
1.5 
amp. 
G?) 
Cur- 
rent 
0.95 
amp. 
m 
Cur- 
rent 
1.5 
amp. 
(9 
Cur- 
rent 
0.95 
amp. 
0) 
Increase 
over 
work at 
0.95 
amp. 
h-i 
e 
1912. 
Feb. 23 
Feb. 26 
Feb. 27 
Feb. 29 
c.c. 
1,955 
1,917 
1,969 
1,828 
1,858 
1,850 
2,384 
2,248 
2,192 
c.c. 
1,595 
1,589 
1,535 
1,444 
1,444 
1,444 
2,028 
1,785 
1,785 
cals. 
9.43 
9.50 
9.67 
9.13 
9.20 
9.25 
11.71 
11.13 
11.03 
cals. 
8.03 
7.61 
7.48 
7.08 
7.08 
7.08 
9.78 
8.72 
8.72 
cals. 
1.40 
1.89 
2.19 
2.05 
2.12 
2.17 
1.93 
2.41 
2.31 
88 
91 
88 
88 
87 
89 
106 
102 
102 
88 
93 
87 
86 
86 
86 
107 
102 
102 
cals. 
1.91 
1.96 
1.91 
1.91 
1.89 
1.91 
2.17 
2.11 
2.12 
cals. 
1.24 
1.28 
1.24 
1.22 
1.22 
1.22 
1.35 
1.35 
1.35 
cal. 
0.67 
.68 
.67 
.69 
.67 
.69 
.82 
.76 
.77 
p. ct. 
47.9 
36.0 
30.6 
33.7 
31.6 
31.8 
42.5 
31.5 
33.3 
GENERAL CONSIDERATION OF THE EXPERIMENTAL DATA OBTAINED WITH THE 
PROFESSIONAL SUBJECT M. A. M. 
With the professional subject M. A. M., such an extensive series of ex- 
periments was obtained at the magnetization of 1.5 amperes and with all 
possible speeds that it seemed practicable to establish a definite mathematical 
relationship between the muscular work performed and the total heat output. 
As frequently stated in the discussion of these tables, individual periods or 
experiments may give abnormal results, and the reader has been cautioned 
not to put undue confidence in these. We believe, however, that the best 
method of studying the research as a whole is to give all of the data careful 
scrutiny and, if possible, secure a series of curves from which the efficiency 
and the total heat output at any speed may be obtained. For this purpose 
we have used the results secured with M. A. M. at speeds ranging from 70 
to 128 revolutions to plot a curve showing the probable value for the oxygen 
consumption at the different rates of speed. With a magnetization of 1.5 
amperes, average values were secured at 70, 80, 90, 95, 102, 110, 113, 117, 
and 128 revolutions per minute respectively. The points for 70, 90, 95, 102, 
110, and 113 revolutions were obtained from an average of five or more pe- 
riods at or about these speeds; for 80 revolutions the point was secured from 
the results of 3 periods; for 117 revolutions from 2 periods; and for 128 revo- 
lutions from only 1 period. In a similar manner the results obtained with 
magnetizations of 1.25, 1.1, 0.95, and 0.5 amperes were used to plot curves 
for the oxygen consumption per minute for different speeds. These curves 
are all given in fig. 4. 
It is seen that the form taken by the most probable curve is, in all degrees 
of magnetization, a straight line and consequently there is a regular agree- 
ment between the oxygen intake per minute and the rate of revolution, 
