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Fig. 9. Means of binned rectified EMG traces of the external oblique muscle during
(A) coupled walking: breathing and footfall in phase, (B) uncoupled running
relative to breath: the onset of expiratory airflow to the end of inspiratory
airflow and (C) uncoupled running relative to stride: one stride length. Data
are presented from Goose A, averaged over 20 breaths or 20 strides. The
external oblique is an expiratory muscle and demonstrates no locomotor
activity.