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Motor unit action potentials of the cricopharyngeal (CP) sphincter muscle. A: Tonic electromyogram (EMG) activity. B: Foreburst activity. C: Rebound burst activity. Note the increase in duration, amplitude and frequency of the motor units during the foreburst and rebound bursts before and after the CP-EMG pause recorded from a window, as demonstrated in the uppermost trace[77].
