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Related Experiment Videos

Respiratory muscle activity during repeated airflow interruption.

J Mead1, M B Reid

  • 1Department of Environmental Science and Physiology, Harvard School of Public Health, Boston, Massachusetts 02115.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|June 1, 1988
PubMed
Summary

Interrupting speech at the glottis (voice box) caused unique respiratory muscle activity. Other interruption methods did not produce these distinct patterns, suggesting central or laryngeal control.

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Area of Science:

  • Respiratory Physiology
  • Speech Science
  • Neuroscience

Background:

  • Understanding the neural control of breathing and speech is crucial for diagnosing and treating respiratory and speech disorders.
  • Active expirations involve complex coordination of respiratory muscles, but the precise neural mechanisms during speech interruptions are not fully understood.

Purpose of the Study:

  • To investigate the electromyogram (EMG) activity of respiratory muscles during interrupted active expirations.
  • To determine if the location of the interruption (glottic vs. non-glottic) influences respiratory muscle activation patterns.

Main Methods:

  • Subjects performed rapid, successive interruptions of active expirations using different methods: glottic (e.g., "uh-uh-uh"), tongue-on-mouthpiece (e.g., "te-te-te"), and external valve.

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  • Respiratory muscle EMG activity was recorded during these tasks.

    • Main Results:

    • Glottic interruptions at 5-8 Hz elicited synchronous expiratory muscle bursts and, in one subject, diaphragmatic bursts during flow phases.
    • Interruptions via tongue-on-mouthpiece or external valve did not produce similar synchronous bursts.
    • Mechanical conditions at the muscular and pulmonary levels were similar across all interruption types.

    Conclusions:

    • The observed differences in respiratory muscle activity suggest that glottic interruptions are either centrally programmed or reflexly mediated at the laryngeal level.
    • These findings provide insights into the neural control of speech breathing and the role of the larynx in modulating respiratory muscle responses.