Fig. 7. Ensemble averages of electromyographic (EMG) activity of the abdominal
portion of the external oblique muscle. This muscle has a locomotor function,
revealed by a consistent bursting pattern in all dogs and a clear bursting
pattern in the average across dogs. A ventilatory function is not evident,
given the absence of bursting in the uncoupled breath averages. 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.
