Fig. 3. 
O2max plotted
against body mass Mb for the 34 mammalian species
separated into athletic (open triangles) and non-athletic (filled triangles)
species. The heavy line represents the allometric regression for all animals
with a slope of 0.872±0.029 (95% confidence limits 0.813, 0.932.
F=890, d.f.=1,32, P<0.00001). The mass exponent of the
allometric regression of athletic species (thin solid line) is 0.942 (95%
confidence limits 0.889, 0.995, F=1609, d.f.=1,?; that of
non-athletic species (broken line) is 0.849 (95% CL 0.799, 0.900;
F=1231, d.f.=1,21), P<0.00001 for both. The slope of
athletic species is significantly larger than that for the non-athletic
species (F=38.3, P<0.00001). Data from Weibel et al.
(2004). For reference, the
curve for BMR or
O2bas (blue
line) is plotted after Kleiber
(1947).