Fig. 1. Organismal oxygen consumption and blood flows in guinea fowl during unloaded, trunk-loaded and distal-limb-loaded running at 1.5 m s^-1. (A) Net oxygen consumption, calculated as the mean values during running minus the mean resting value. (B) Cardiac output measured by dilution of the injected microspheres. (C) Summed flow to the brain and abdominal organs. (D) Summed blood flow to all of the leg muscles. Values are means ± s.e.m. (N=6). P values are indicated above each bar.