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Chest wall movements prior to phonation.

R J Baken, S A Cavallo, K L Weissman

    Journal of Speech and Hearing Research
    |December 1, 1979
    PubMed
    Summary
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    Chest wall movements during vocal reaction times were studied. An adjustment period, crucial for prephonatory posture, varied with lung volume but not breathing phase.

    Area of Science:

    • Physiology
    • Respiratory Mechanics
    • Speech Production

    Background:

    • Understanding the complex interplay between respiratory mechanics and vocalization is crucial for diagnosing and treating speech disorders.
    • Previous research has established the link between lung volume and speech breathing, but the precise timing and coordination of chest wall movements during the reaction interval require further elucidation.

    Purpose of the Study:

    • To investigate and time chest wall movements during the reaction interval between an acoustic stimulus and vocal response in healthy males.
    • To delineate the distinct phases within the reaction-time interval and their relationship to respiratory and postural adjustments.

    Main Methods:

    • Eight healthy adult males participated in the study.
    • Chest wall movements were monitored and timed during the interval between auditory stimulus presentation and vocalization.

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  • Analysis focused on identifying distinct temporal phases and movement patterns of the rib cage and abdomen.

    • Main Results:

    • The reaction-time interval was characterized by two phases: a latency period and an adjustment period.
    • The latency period's duration was independent of the chest wall's state at stimulus onset.
    • The adjustment period involved opposing movements of the rib cage and abdomen to establish a prephonatory postural set, with its duration significantly influenced by lung volume but not the preceding ventilatory phase.

    Conclusions:

    • The findings reveal a two-phase reaction-time interval for vocal response initiation, involving distinct latency and postural adjustment periods.
    • Chest wall adjustments for speech preparation are significantly modulated by lung volume, highlighting its importance in respiratory control for speech.
    • These insights contribute to a deeper understanding of the neuromuscular control of speech breathing and postural stability.