Document Detail

Effects of prolonged oral reading on time-based glottal flow waveform parameters with special reference to gender differences.
MedLine Citation:
PMID:  9311158     Owner:  NLM     Status:  MEDLINE    
The effects of prolonged (5 x 45 min) reading (loading) on time-based glottal waveform parameters of normal female and male subjects (n = 80) were studied. Two rest (morning and noon) and three loading (two in the morning and one in the afternoon) samples were recorded and analyzed. The glottal waveforms were obtained by inverse filtering of the acoustical signal using an automatic method. The following time-based parameters were analyzed from the estimated glottal flow waveform: (1) length of fundamental period (T); (2) open quotient (OQ); (3) speed quotient (SQ); (4) closing quotient (C1Q). The analysis was based on inverse filtering of the first stressed syllable of 'paappa' words produced with normal, maximally soft and maximally loud phonation. In the morning samples the loading affected only the T and OQ values of normal phonation in a statistically significant manner. In the afternoon all the quotient values changed statistically significantly in loud and normal phonation. On the basis of increased SQ and decreased C1Q values of females it is hypothesized that the female voices tended to change towards hyperfunction due to vocal loading.
E R Lauri; P Alku; E Vilkman; E Sala; M Sihvo
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Folia phoniatrica et logopaedica : official organ of the International Association of Logopedics and Phoniatrics (IALP)     Volume:  49     ISSN:  1021-7762     ISO Abbreviation:  Folia Phoniatr Logop     Publication Date:  1997  
Date Detail:
Created Date:  1997-12-29     Completed Date:  1997-12-29     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9422792     Medline TA:  Folia Phoniatr Logop     Country:  SWITZERLAND    
Other Details:
Languages:  eng     Pagination:  234-46     Citation Subset:  IM    
Department of Otolaryngology and Phoniatrics, Helsinki University Central Hospital, Finland.
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MeSH Terms
Glottis / physiology*
Middle Aged
Pulmonary Ventilation*
Sex Characteristics
Time Factors

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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