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Induced fatigue effects on velopharyngeal closure force.

D P Kuehn1, J B Moon

  • 1Department of Speech & Hearing Sciences, University of Illinois at Urbana-Champaign, 61820, USA. d-kuehn@uiuc.edu

Journal of Speech, Language, and Hearing Research : JSLHR
|April 11, 2000
PubMed
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This study induced velopharyngeal fatigue in healthy speakers using external air pressure loads. Higher loads generally increased fatigue rates, with some subjects reaching exhaustion.

Area of Science:

  • Speech Science
  • Physiology
  • Biomechanics

Background:

  • Velopharyngeal closure is crucial for speech production.
  • Understanding velopharyngeal fatigue is important for diagnosing and treating speech disorders.

Purpose of the Study:

  • To investigate the effects of induced velopharyngeal fatigue in individuals with normal speech mechanisms.
  • To quantify the relationship between external loading and velopharyngeal fatigue rates.

Main Methods:

  • Utilized a force-sensing bulb and intramuscular electrodes to measure velopharyngeal closure force and muscle activation.
  • Subjects repeated the syllable /si/ under varying levels of external nasal air pressure (0-35 cm H2O).
  • Fatigue was quantified as the slope of linear regression fit to force data over syllable repetitions.

Related Experiment Videos

Main Results:

  • Induced velopharyngeal fatigue was achievable in most subjects.
  • Higher external air pressure loads (25 and 35 cm H2O) generally resulted in greater fatigue rates.
  • Two subjects (1 male, 1 female) reached exhaustion at higher pressure levels; three showed minimal fatigue.

Conclusions:

  • External loading can effectively induce velopharyngeal fatigue in healthy speakers.
  • Fatigue rates increase with higher external loads.
  • Individual variability in fatigue response exists, with no significant sex-based differences observed.