Fig. 3. Organismal oxygen consumption versus total leg muscle blood flow of guinea fowl at rest, running at 1.5 m s^–1 on the level, running at 1.5 m s^–1 on a 15% gradient and running at 2.28–2.39 m s^–1 on the level. Values are means ± s.e.m. (N=8). Total blood flow increases linearly with organismal oxygen consumption (y=8.38x–104.3; r²=0.9997).