MECHANICAL EFFICIENCY OF THE HUMAN BODY 
141 
lutions was 22.1 per cent and with 105 revolutions 17.7 per cent. With an 
average heat equivalent of the effective work of approximately 1.58 calories, 
the average of 10 periods in which the speed was 71 revolutions per minute 
showed a net efficiency of 24.5 per cent, while 1 period with the considerably 
greater speed of 108 revolutions gave a net efficiency of 15.6 per cent. Groups 
of experiments with an approximate heat equivalent of 1.35 calories are also 
compared, three periods with a speed of 71 revolutions per minute showing 
an average efficiency of 23.1 per cent; 1 period with a speed of 94 revolutions 
an efficiency of 20.4 per cent; and 4 periods with a speed of 105 revolutions 
an efficiency of 17.0 per cent. In still another group with a heat equivalent 
Table 126. — Efficiency of subject M.A.M. compared at different speeds when the amount of 
effective muscular work per minute remained constant. (Ergometer II.) 
[Basal values obtained with subject lying on couch.] 
Heat equiv- 
Revolu- 
alent of 
Net 
efficiency. 
Date. 
tions per 
minute. 
external 
work per 
minute. 
1912. 
Effective work, 1.95 calories. 
cals. 
p.ct. 
Feb. 23 
88 
1.91 
23.1 
Feb. 26 
88 
1.91 
22.4 
Feb. 27 
88 
1.91 
24.0 
89 
1.91 
23.4 
Mar. 15 
89 
1.92 
21.7 
Feb. 15 
90 
1.93 
22.0 
Feb. 7 
90 
1.94 
22.4 
Feb. 1 
90 
1.94 
22.4 
Jan. 24 
90 
1.94 
21.9 
Mar. 15 
90 
1.94 
23.2 
Jan. 26 
91 
1.95 
21.0 
Feb. 26 
91 
1.96 
23.5 
Mar. 15 
91 
1.96 
23.1 
91 
1.96 
23.3 
Mar. 28 
92 
1.96 
21.6 
Mar. 15 
92 
1.97 
23.2 
Feb. 9 
92 
1.97 
22.2 
Feb. 8 
Av. 18 periods 
Apr. 8 
94 
1.99 
21.7 
90 
1.94 
33.6 
122 
1.94 
15.5 
Av. 2 periods . 
Mar. 15 
126 
1.98 
15.8 
1X4 
1.96 
15.7 
Effective work, 1.80 calories. 
78 
1.73 
21.3 
Mar. 28 
80 
1.75 
22.5 
Av. 3 periods . 
Apr. 8 
84 
1.83 
22.5 
80 
1.77 
33.1 
108 1.83 17.7 
Effective work, 1.58 calories. 
1912. 
Mar. 13 
70 1.56 
24.9 
70 1.56 
24.0 
70 
1.57 
23.4 
Mar. 12 
71 
1.57 
25.2 
Mar. 14 
71 
1.57 
24.5 
71 
1.57 
24.7 
71 
1.57 
24.3 
Mar. 12 
71 
1.57 
24.8 
Mar. 18 
71 
1.57 
24.6 
Mar. 12 
Av. 10 periods 
Apr. 9 
72 1.59 24.9 
71 1.87 34.5 
108 1.68 15.6 
