Figure 1. Respiratory and GG EMG changes following exposure to episodic or continuous hypoxia.

A, episodic hypoxia. Integrated GG EMG burst amplitude and V_T significantly increase during each hypoxic episode (denoted by bars). Post hypoxia, GG EMG burst amplitude transiently decreases; increasing over the next 60 min to a level significantly greater than baseline with no significant increase in V_T. B, continuous hypoxia. GG EMG burst amplitude and V_T significantly increase during the 15 min exposure to hypoxia (denoted by bar). Post hypoxia, GG EMG burst amplitude decreases, remaining at this lower level over the next 60 min. V_T transiently decreases post hypoxia, before returning to and remaining at baseline levels. a.u., arbitrary units.