Frequency Characteristics of the Vibratory Effect upon Late Response of the Thyroarytenoid Muscle to Superior Laryngeal Nerve Stimulation
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概要
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We reported previously that when the internal branch of the superior laryngeal nerve (ISLN) of generally anesthetized cats was electrically stimulated, short latency response (early response, ER) and long latency response (late response, LR) emerged in the thyroarytenoid muscle (TA). Vibratory stimulation, applied to the contralateral subglottic mucosa as a conditioning stimulation, enhanced LR, particularly in phase I (the transitional phase from inspiration to expiration). When the vibratory frequency was elevated from 100 Hz to 350 Hz at 50 Hz interval in phase I, vibration effect was observed in all frequencies investigated. Maximum effect was obtained at 300 Hz. Following denervation of ISLN, the vibration effect was minimized, and it did not depend on the vibratory frequency.<BR>In the present study, the data processing technique was partly modified : the sampling time of integrated EMG of LR was shortened. As a result, LR was occasionally divided into two responses L<SUB>1</SUB>R and L<SUB>2</SUB>R. The effect of vibratory stimulation on the subglottic mucosa differed for L<SUB>1</SUB>R and L<SUB>2</SUB>R.<BR>The effect of subglottic vibration upon LR as a function of vibratory frequency may reflect frequency characteristics of the mechanoreceptors to vibration in the subglottic mucosa. If this is the case, the aforementioned results indicate that there are two groups of mechanoreceptors having different frequency characteristics against vibration. The mechanoreceptors in the laryngeal mucosa play an important part in auto monitoring systems of vibration.
- The Japan Laryngological Associationの論文
The Japan Laryngological Association | 論文
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