Electrical Activity from the Superior Pharyngeal Constrictor During Reflexive and Nonreflexive Tasks The purpose of this investigation was to determine, in a quantitative manner, which, if any, nonswallowing tasks produce significant levels of activation in the superior pharyngeal constrictor muscle of normal human subjects. Bipolar hooked wire electrodes were inserted in the superior pharyngeal constrictor muscle of 15 healthy subjects. Electrode placement ... Research Article
Research Article  |   December 01, 1989
Electrical Activity from the Superior Pharyngeal Constrictor During Reflexive and Nonreflexive Tasks
 
Author Affiliations & Notes
  • Adrienne L. Perlman
    VA Medical Center, Iowa City
  • Erich S. Luschei
    University of Iowa, Iowa City
  • Charles E. Du Mond
    Syntex Research, Palo Alto, CA
Article Information
Research Articles
Research Article   |   December 01, 1989
Electrical Activity from the Superior Pharyngeal Constrictor During Reflexive and Nonreflexive Tasks
Journal of Speech, Language, and Hearing Research, December 1989, Vol. 32, 749-754. doi:10.1044/jshr.3204.749
History: Received August 29, 1988 , Accepted February 9, 1989
 
Journal of Speech, Language, and Hearing Research, December 1989, Vol. 32, 749-754. doi:10.1044/jshr.3204.749
History: Received August 29, 1988; Accepted February 9, 1989

The purpose of this investigation was to determine, in a quantitative manner, which, if any, nonswallowing tasks produce significant levels of activation in the superior pharyngeal constrictor muscle of normal human subjects. Bipolar hooked wire electrodes were inserted in the superior pharyngeal constrictor muscle of 15 healthy subjects. Electrode placement was controlled. Each subject performed two reflexive tasks, six voluntary tasks requiring phonation, and four nonspeech voluntary tasks. The electromyogram (EMG) was rectified and integrated. The resulting number was then transformed by taking its natural logarithm. An ANOVA was performed and a linear model was estimated. The magnitude of the EMG activity was related to the location of the electrodes. The largest values were recorded in the lateral-superior placement, followed by the lateral-inferior, medial-inferior and medial-superior. The superior pharyngeal contrictor was found to be a muscle activated primarily during reflexive activity. There was a general trend in the amplitude of EMG activity in relationship to task. Swallowing produced the greatest amount of activity and a gag produced about 60% of the activity produced by the swallow. Two tasks, production of the work /hk/ in which the phoneme /k/ was stressed, and a "modified Valsalva," which was actually a hard /k/ held for several seconds, produced the next greatest level of EMG.

Order a Subscription
Pay Per View
Entire Journal of Speech, Language, and Hearing Research content & archive
24-hour access
This Article
24-hour access