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Related Experiment Videos

Lung volume changes during relatively fluent speech in stutterers

S J Johnston1, K L Watkin, P T Macklem

  • 1Meakins-Christie Laboratories, McGill University Clinic Royal Victoria Hospital, Montreal, Quebec, Canada.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|August 1, 1993
PubMed
Summary
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Stutterers sustain fluency by speaking at unusually high or low lung volumes, deviating from normal breathing patterns. This altered speech breathing may explain observed differences in muscle activity compared to fluent speakers.

Area of Science:

  • Speech-language pathology
  • Respiratory physiology
  • Neurogenic communication disorders

Background:

  • Breathing patterns significantly influence speech production.
  • Stuttering is a complex speech disorder with potential respiratory underpinnings.
  • Understanding respiratory mechanics in stuttering is crucial for developing effective interventions.

Purpose of the Study:

  • To investigate and compare breathing patterns during speech in individuals who stutter (stutterers) and typically fluent speakers.
  • To analyze respiratory muscle activity and lung volume utilization in both groups during speech tasks.
  • To identify potential respiratory strategies employed by stutterers to maintain speech fluency.

Main Methods:

  • Measurement of rib cage and abdominal displacements to assess respiratory muscle function.

Related Experiment Videos

  • Monitoring of esophageal, gastric, and transdiaphragmatic pressures for detailed pressure analysis.
  • Comparison of breathing patterns, lung volumes, and muscle recruitment strategies between stutterers and normal subjects during spontaneous and reading speech tasks.

    • Main Results:

    • Stutterers utilized lung volumes significantly higher or lower than normal subjects, often avoiding the functional residual capacity (FRC).
    • Distinct breathing strategies were observed: stutterers used diaphragmatic braking at high lung volumes and abdominal recruitment below FRC, unlike controls.
    • Breath sizes showed a log-normal distribution in stutterers versus a Gaussian distribution in controls, indicating less consistent breath patterns.

    Conclusions:

    • Stutterers employ abnormal lung volume strategies (high or low) to sustain speech fluency.
    • These altered breathing patterns correlate with unique respiratory muscle activation patterns not seen in fluent speakers.
    • The findings suggest that respiratory dysregulation may be a key factor contributing to the speech characteristics of stuttering.