Fig. 3.

Representative compound DIAm EMG burst and simultaneous single motor unit recordings obtained during eupnea in a spontaneously breathing anesthetized rat. The arrow at top indicates the onset point of compound EMG activity. Three motor units were discriminated via waveform analysis throughout the EMG burst with the superimposed signal shown at left and trains of motor unit action potentials at right for each motor unit. Note differences in time scales between superimposed single motor unit waveforms and compound EMG recordings.