Fig. 10. Ensemble averages of electromyographic (EMG) activity of the deep pectoralis muscle. This muscle has a clear locomotor function that is consistent between dogs, but no ventilatory function. Samples are from two dogs (A and B), and the average across two dogs (C), with ventilatory (bold lines) and acceleration (thin lines) traces to reveal relationships to breath and stride (D). 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.