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Lung volume effects on pharyngeal swallowing physiology.

Roxann Diez Gross1, Charles W Atwood, Judith P Grayhack

  • 1Department of Audiology and Speech Pathology, Veterans Affairs Pittsburgh Healthcare System, Pittsburgh, PA 15240, USA. Roxann.Gross@med.va.gov

Journal of Applied Physiology (Bethesda, Md. : 1985)
|August 12, 2003
PubMed
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Lung volume significantly impacts swallowing duration, with residual volume prolonging pharyngeal activity. This suggests the respiratory system plays a key role in swallowing integrity, potentially informing new treatments for oropharyngeal dysphagia.

Area of Science:

  • Physiology
  • Respiratory System
  • Deglutition

Background:

  • Swallowing (deglutition) is a complex physiological process.
  • The interplay between respiratory function and swallowing is not fully understood.
  • Oropharyngeal dysphagia affects millions, necessitating research into its underlying mechanisms.

Purpose of the Study:

  • To investigate the effect of varying lung volumes on swallowing physiology.
  • To determine if respiratory maneuvers influence specific swallowing measures.
  • To explore the regulatory role of the respiratory system in deglutition.

Main Methods:

  • Prospective, repeated-measures design.
  • Simultaneous videofluoroscopy, electromyography, and respiratory inductance plethysmography.

Related Experiment Videos

  • 28 healthy adults swallowed standardized boluses at total lung capacity, functional residual capacity, and residual volume.

    • Main Results:

    • Pharyngeal activity duration was significantly longer at residual volume compared to total lung capacity and functional residual capacity.
    • Bolus transit time and superior constrictor electromyography showed no significant differences across lung volumes.
    • Findings support a regulatory role for the respiratory system in swallowing.

    Conclusions:

    • Lung volume variation influences pharyngeal activity duration during swallowing.
    • Positive subglottic air pressure may be crucial for maintaining swallowing integrity.
    • Results may lead to novel treatment strategies for oropharyngeal dysphagia based on respiratory physiology.