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Related Experiment Videos

Loading changes in time-based parameters of glottal flow waveforms in different ergonomic conditions

E Vilkman1, E R Lauri, P Alku

  • 1Department of Otolaryngology and Phoniatrics, University of Oulu, Finland. Erkki.Vilkman@oulu.fi

Folia Phoniatrica Et Logopaedica : Official Organ of the International Association of Logopedics and Phoniatrics (IALP)
|January 1, 1997
PubMed
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Environmental and ergonomic factors significantly impact voice production during prolonged reading. High humidity and loud speech levels altered glottal waveform parameters in both male and female subjects.

Area of Science:

  • Speech Science
  • Acoustic Phonetics
  • Human Factors Engineering

Background:

  • Prolonged vocal tasks can affect voice quality.
  • Environmental and ergonomic factors are known to influence physiological processes.
  • Understanding these influences is crucial for vocal health and performance.

Purpose of the Study:

  • To investigate the effects of prolonged reading under varied environmental and ergonomic conditions on time-based glottal waveform parameters.
  • To analyze how speech output level, posture, and humidity interact to affect vocal function.
  • To identify gender-specific responses to these loading factors.

Main Methods:

  • Eighty healthy subjects (males and females) participated in prolonged reading sessions (5 x 45 min).

Related Experiment Videos

  • Subjects were exposed to eight combinations of speech output levels (normal/high), posture (sitting/standing), and humidity (low/high).
  • Glottal waveforms were analyzed using inverse filtering, focusing on fundamental period, open quotient, speed quotient, and closing quotient.

    • Main Results:

    • Relative humidity emerged as a significant factor influencing several glottal parameters.
    • Striking interactions were observed between subject gender and the loading factors (speech level, posture, humidity).
    • Specific glottal parameters showed significant changes under different environmental and ergonomic conditions.

    Conclusions:

    • Environmental factors, particularly humidity, play a notable role in modulating voice production during sustained vocal tasks.
    • The interplay between gender and environmental/ergonomic conditions significantly affects glottal function.
    • These findings have implications for vocal load management in occupational settings and vocal pedagogy.