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Related Experiment Videos

Abdominal muscle activity during speech production.

J D Hoit1, B L Plassman, R W Lansing

  • 1Department of Speech and Hearing Sciences, University of Arizona, Tucson 85721.

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

Body position significantly alters abdominal muscle activity during breathing and speech. Upright positions show higher lateral abdominal muscle engagement, especially during loud speech and low lung volumes.

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Area of Science:

  • Physiology
  • Biomechanics
  • Speech Science

Background:

  • Abdominal muscle function is crucial for respiration and speech.
  • Previous research on abdominal muscle activity has primarily focused on upright postures.

Purpose of the Study:

  • To investigate abdominal muscle electromyographic (EMG) activity during resting tidal breathing and speech production.
  • To compare this activity between upright and supine body positions in young adults.
  • To identify sex-related differences in abdominal muscle activation patterns.

Main Methods:

  • Electromyography (EMG) was used to record abdominal muscle activity.
  • Activity was measured during resting tidal breathing and speech tasks.
  • Data were collected in both upright and supine positions.

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  • Participants included five males and five females.

    • Main Results:

    • Abdominal EMG patterns were highly dependent on body position.
    • Speech production in the upright position showed significant lateral abdominal activity, higher in lower than upper sites.
    • Supine speech production elicited less abdominal activity compared to upright speech.
    • Loud speech and speech at low lung volumes increased abdominal EMG prevalence.

    Conclusions:

    • Body position is a critical factor influencing abdominal muscle recruitment for speech.
    • The lateral abdominal muscles play a significant role in speech breathing, particularly when upright.
    • Findings contribute to understanding respiratory mechanics and neural control of speech.