134 
MUSCULAR WORK 
tially the same rates of revolution were employed, a comparison being made 
of the work done with a current of 1.5 amperes with that done with a current 
of 0.5 ampere. By deducting from the total energy output when the subject 
rode at 1.5 amperes the heat given off when he rode at 0.5 ampere and com- 
paring the difference with the difference in the external muscular work per- 
formed in the two cases, it is possible to compute an efficiency on a basis that 
is open to less objection than any other base-line that we have thus far 
proposed. 
Table 122. — Efficiency in respiration experiments with bicycle ergometer II with currents 
of 0.95, 1.1, and 1.25 amperes. Subject, M. A. M. 
[Basal values obtained in experiments with current of 0.5 ampere.] 
Oxygen intake 
per minute 
during work. 
Heat output per minute 
Revolutions 
Heat equivalent of ex- 
Date. 
during work. 
per minute. 
ternal work per 
minute. 
(ft) 
Em- 
(a) 
(b) 
(c) 
(<*) 
(e) 
(/) 
(ff) 
W 
(i) 
0) 
Cur- 
Cur- 
Cur- 
Cur- 
Increase 
Cur- 
Cur- 
Cur- 
Cur- 
Increase 
C16QCy« 
0X100) 
rent 
0.95 
rent 
0.5 
rent. 
0.95 
rent 
0.5 
rent 
0.95 
rent 
0.5 
rent 
0.95 
rent 
0.5 
work at 
work at 
e 
amp. 
amp. 
amp. 
amp. 
0.5 amp. 
c-d 
amp. 
amp. 
amp. 
amp. 
0.5 amp. 
h—i 
1912. 
c.c 
c.c. 
cals. 
cals. 
cals. 
cals. 
cal. 
cal. 
p. ct. 
Feb. 23 
1,834 
1,378 
9.10 
16.70 
2.40 
108 
108 
1.37 
10.55 
0.82 
34.2 
Feb. 26 
1,485 
1,070 
7.49 
5.15 
2.34 
94 
96 
1.29 
2 .55 
0.74 
31.6 
1,589 
1,070 
7.61 
5.15 
2.46 
93 
96 
1.28 
.55 
0.73 
29.7 
Feb. 29 
1,785 
1,116 
8.72 
»5.46 
3.26 
102 
102 
1.35 
» .55 
0.80 
24.5 
2,028 
1,378 
9.78 
6.70 
3.08 
107 
108 
1.35 
i .55 
0.80 
26.0 
1,907 
1,254 
9.20 
<6.01 
3.19 
104 
104 
1.35 
« .55 
0.80 
25.1 
Cur- 
Cur- 
Cur- 
Cur- 
Cur- 
Cur- 
Cur- 
Cur- 
rent 
rent 
rent 
rent 
rent 
rent 
rent 
rent 
1.1 
0.5 
1.1 
0.5 
1.1 
0.5 
1.1 
0.5 
Apr. 9 
amp. 
amp. 
amp. 
amp. 
2.64 
amp. 
amp. 
amp. 
amp. 
0.72 
27.3 
1,362 
822 
6.65 
'4.01 
71 
72 
1.20 
'0.48 
1,378 
822 
6.73 
4.01 
2.72 
71 
72 
1.19 
.48 
0.71 
26.1 
1,387 
822 
6.81 
4.01 
2.80 
72 
72 
1.20 
.48 
0.72 
25.7 
2,252 
1,378 
11.29 
6.70 
4.59 
108 
108 
1.58 
i .55 
1.03 
22.4 
Cur- 
Cur- 
Cur- 
Cur- 
Cur- 
Cur- 
Cur- 
Cur- 
rent 
rent 
rent 
rent 
rent 
rent 
rent 
rent 
1.25 
0.5 
1.25 
0.5 
1.25 
0.5 
1.25 
0.5 
Apr. 8 
amp. 
amp. 
amp. 
amp. 
3.09 
amp. 
amp. 
amp. 
amp. 
0.87 
28.2 
1,422 
802 
6.97 
3.88 
71 
71 
1.35 
«0.48 
1,425 
833 
6.95 
'4.01 
2.94 
70 
70 
1.33 
i .47 
0.86 
29.3 
1,451 
822 
7.08 
'4.01 
3.07 
71 
72 
1.36 
» .48 
0.88 
28.7 
2,343 
1,254 
11.53 
»6.01 
5.52 
105 
104 
1.83 
2 .55 
1.28 
23.2 
1 Result obtained on Mar. 4. 2 Result obtained on Feb. 28. 
* Average of results obtained on Feb. 28 and Mar. 4, the oxygen being 1,170 and 1,061 c.c, respectively. 
* Result obtained on Feb. 28. 
B Average of results obtained on Mar. 12 and 13, the oxygen being 807 and 837 c.c, respectively. 
8 Average of results obtained on Mar. 12, 14, and 18, the oxygen being 797, 787, 823 c.c, respectively. 
7 Average of two results obtained on Mar. 14. 
Disregarding individual periods with exceptionally high or low values, 
it can be seen that with the professional subject the average efficiency on 
this basis is not far from 30 per cent. Essentially the same value is found for 
the untrained subject E. P. C, while the other untrained subjects J. E. F., 
K. H. A., and J. J. C. show somewhat lower percentages. The values for 
the subject M. A. M. are for the most part very regular, ranging in the 18 
experiments from 26.8 per cent to 33.2 per cent, with practically all of the 
values between 29.7 and 31.0 per cent. 
When the speed is taken into consideration in all the comparisons, how- 
ever, we have for the first time the opportunity to study the effect of an 
