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Motor strategy in rapid sequential swallowing: new insights.

G Chi-Fishman1, B C Sonies

  • 1Clinical Center, National Institutes of Health, Bethesda, MD 20892, USA. gcf@nih.gov

Journal of Speech, Language, and Hearing Research : JSLHR
|February 24, 2001
PubMed
Summary
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Rapid sequential swallowing involves unique physiological patterns and movement strategies, showing significant differences compared to discrete swallows. The hyolaryngeal system demonstrates adaptable, cyclical movements and muscle activation during these complex tasks.

Area of Science:

  • Physiology
  • Biomechanics
  • Neuroscience

Background:

  • Swallowing is a complex motor act crucial for nutrition and airway protection.
  • Understanding the physiological underpinnings of different swallowing patterns, like sequential swallowing, is vital for clinical applications.

Purpose of the Study:

  • To investigate the physiological properties and movement strategies during rapid sequential swallowing.
  • To compare sequential swallowing with discrete swallowing using simultaneous videofluoroscopy and electromyography.

Main Methods:

  • Ten healthy subjects underwent simultaneous videofluoroscopy (VFS) and submental surface electromyography (EMG).
  • Tasks included discrete (5, 15 cc) and sequential (150 cc) swallows in various head postures.
  • Analyses focused on VFS event timing, bolus transit, and EMG amplitude waveforms.

Related Experiment Videos

Main Results:

  • Sequential swallows showed shorter VFS event durations but longer pharyngeal transit and stage transition times than discrete swallows.
  • The hyolaryngeal system displayed cyclical movements and repetitive muscle activation patterns during sequential swallowing.
  • Increased peak EMG amplitude was observed in most subjects during sequential swallowing; pharyngeal bolus merging and penetration without aspiration were noted.

Conclusions:

  • Sequential swallowing utilizes distinct physiological and biomechanical strategies compared to discrete swallowing.
  • Significant intersubject variability in timing and EMG amplitude highlights individual differences in swallowing adaptation.
  • Findings support the concept of inherent plasticity within the deglutitive motor system, allowing for task-specific accommodation.