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Fig. 2. Means of binned rectified EMG traces of the external intercostal, appendicocostalis and external oblique muscles during hissing when standing. The rectified EMG trace is sampled relative to breath (the onset of expiratory airflow to the end of inspiratory airflow). During hissing the external intercostal demonstrates no respiratory bursting, the appendicocostalis demonstrates inspiratory activity and increased bursting consistent with a larger inspiration and the external oblique demonstrates expiratory activity and increased bursting consistent with an increased expiration.





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