Fig. 7.

Representative integrated traces of diaphragm (Dia), sixth, seventh external intercostal (T6, T7 EIC), and external oblique (EO) muscle (A), and Dia, eighth, ninth (T8, T9) EIC and rectus abdominus (RA) muscle (B), showing the protocol of AIH in unanesthetized rats. There is a long-lasting increase in diaphragm amplitude above baseline (dotted white line) corresponding to Dia long-term facilitation (LTF) (arrows on right) following AIH (A and B). Caudal segments T6, T7, T8, T9 EIC and RA muscles (C and D) do not show a change in amplitude after AIH (i.e., they do no exhibit LTF after AIH). The external oblique muscle shows a decrease in EMG amplitude during but not after AIH (C).