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Swallow thresholds in human mastication

J F Prinz1, P W Lucas

  • 1Department of Anatomy, University of Hong Kong.

Archives of Oral Biology
|May 1, 1995
PubMed
Summary
This summary is machine-generated.

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Chewing and swallowing depend on Brazil nut particle size and concentration. Swallowing is impaired below 1.4 mm particle size and 20% concentration, requiring slower chewing for oral detection.

Area of Science:

  • Food science
  • Oral physiology
  • Biomechanics

Background:

  • Chewing and swallowing are complex motor acts influenced by food properties.
  • Understanding the relationship between food texture, particle size, and oral processing is crucial for food design and dysphagia management.

Purpose of the Study:

  • To investigate the effects of Brazil nut particle size and concentration on human chewing and swallowing behavior.
  • To develop a 'swallowing index' to quantify the ease of swallowing based on oral processing parameters.

Main Methods:

  • Brazil nut particles were sieved into four size classes.
  • Particles were suspended in yoghurt at varying concentrations and fed to nine human participants.
  • Chewing duration, number of chews, and chewing frequency were recorded.

Related Experiment Videos

  • The swallowing index was calculated as the rate of change of chewing frequency over time.

    • Main Results:

    • Increased particle size and concentration significantly prolonged chewing time and increased the number of chews before swallowing.
    • Chewing frequency decreased with larger particle sizes and higher concentrations.
    • The swallowing index showed a sharp increase at concentrations below 20% and particle sizes below 1.4 mm.

    Conclusions:

    • Swallowing is facilitated when food particles are below a critical size (1.4 mm) and concentration (20%), ensuring adequate lubrication.
    • Lower concentrations and smaller particle sizes trigger slower chewing, indicating sensory feedback mechanisms for particle size detection by the oral mucosa.