Fig. 8. Ensemble averages of electromyographic (EMG) activity of the abdominal portion of the internal oblique muscle. As in Fig. 7, this muscle has a locomotor function but no ventilatory function during running. Samples are from four dogs (A-D), and the average across four dogs (E), with ventilatory (bold lines) and acceleration (thin lines) traces to reveal relationships to breath and stride (F). IF indicates ipsilateral forelimb support and CF contralateral forelimb support in the footfall bars at the bottom. All traces are on the same time scale. Exp., expiration; Insp., inspiration.