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Fig. 1. Representative organismal oxygen consumption of a guinea fowl during rest
and during level running (circles) and incline running (triangles) over a
range of speeds. The bird was initially tested running at 1.5 m
s1 on the level and 1.5 m s1 on a 15%
gradient. Subsequent measurements were made over a range of faster running
speeds (2.03.0 m s1) in order to determine the speed
for which the organismal oxygen consumption matched that at 1.5 m
s1 and 15% gradient (as indicated by arrows). Lines were
fitted by eye to illustrate the experimental design.