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Fig. 6. Differences (a-b) in metabolic rate (
CO2 release) between
running on (a) inclines of -60° (A), -30° (B), 30° (C), 60°
(D) and (b) level walking. Differences are plotted as a function of running
speed of the animal over ground and derived from the mean values for each
speed bin (see Fig. 4). Dotted
lines indicate both equal metabolic costs between inclined and level walking
(horizontal line), and 90 mm s-1 walking speed (vertical line),
which was the maximum speed used for linear regression fits. Values are means
± S.E.M.