Journal of Applied Physiology
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J Appl Physiol 95: 2211-2217, 2003. First published August 8, 2003; doi:10.1152/japplphysiol.00316.2003
8750-7587/03 $5.00
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TRANSLATIONAL PHYSIOLOGY

Lung volume effects on pharyngeal swallowing physiology

Roxann Diez Gross,1,2 Charles W. Atwood, Jr.,3 Judith P. Grayhack,1,2 and Susan Shaiman2

1Department of Audiology and Speech Pathology and 3Pulmonary Section, Veterans Affairs Pittsburgh Healthcare System, Pittsburgh 15240; and 2Department of Communication Sciences and Disorders, School of Health and Rehabilitation Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania 15260

Submitted 27 March 2003 ; accepted in final form 7 August 2003

The experiment was a prospective, repeated-measures design intended to determine how the variation of lung volume affects specific measures of swallowing physiology. Swallows were recorded in 28 healthy subjects, who ranged in age from 21 to 40 yr (mean age of 29 yr), by using simultaneous videofluoroscopy, bipolar intramuscular electromyography, and respiratory inductance plethysmography. Each subject swallowed three standardized pudding-like consistency boluses at three randomized lung volumes: total lung capacity, functional residual capacity, and residual volume. The results showed that pharyngeal activity duration of deglutition for swallows produced at residual volume was significantly longer than those occurring at total lung capacity or at functional residual capacity. No significant differences were found for bolus transit time or intramuscular electromyography of the superior constrictor. The results of this experiment lend support to the hypothesis that the respiratory system may have a regulatory function related to swallowing and that positive subglottic air pressure may be important for swallowing integrity. Eventually, new treatment paradigms for oropharyngeal dysphagia that are based on respiratory physiology may be developed.

deglutition; dysphagia; dynamic; subglottic mechanoreceptors; subglottic air pressure


Address for reprint requests and other correspondence: R. D. Gross, VA Pittsburgh Healthcare System, Dept. of Audiology and Speech Pathology, University Drive C (132A-U), Pittsburgh, PA 15240 (E-mail: Roxann.Gross{at}med.va.gov).






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