Abstract
The activities of the intrinsic laryngeal and respiratory muscles were compared during coughing between non-tracheotomized and tracheotomized conditions. In non-tracheotomized and tracheotomized cats, when the peak values of the intratracheal pressure during coughing increased, the EMG amplitudes of the intrinsic laryngeal and respiratory muscles also increased significantly. When the intratracheal pressure peak during coughing increased over 60 cmH2O, the rectus abdominis muscle in tracheotomized cats suddenly increased its amplitude compared to that of non-tracheotomized cats. These results suggest that the function of the larynx during coughing is to modulate the activities of the respiratory and intrinsic laryngeal muscles.
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