Aerodynamic and Electroglottographic Measures of Normal Voice Production Intrasubject Variability Within and Across Sessions Research Article
Research Article  |   February 01, 1994
Aerodynamic and Electroglottographic Measures of Normal Voice Production
 
Author Affiliations & Notes
  • Maureen B. Higgins
    Boys Town National Research Hospital Omaha, NE
  • Ronald Netsell
    Boys Town National Research Hospital Omaha, NE
  • Laura Schulte
    Boys Town National Research Hospital Omaha, NE
  • Contact author: Maureen B. Higgins, PhD, Boys Town National Research Hospital, 555 North 30th Street, Omaha, NE 68131.
  • Currently affiliated with Southwest Missouri State University, Springfield.
    Currently affiliated with Southwest Missouri State University, Springfield.×
Article Information
Speech, Voice & Prosody / Speech / Research Articles
Research Article   |   February 01, 1994
Aerodynamic and Electroglottographic Measures of Normal Voice Production
Journal of Speech, Language, and Hearing Research, February 1994, Vol. 37, 38-45. doi:10.1044/jshr.3701.38
History: Received December 11, 1992 , Accepted August 19, 1993
 
Journal of Speech, Language, and Hearing Research, February 1994, Vol. 37, 38-45. doi:10.1044/jshr.3701.38
History: Received December 11, 1992; Accepted August 19, 1993

The purpose of this investigation was to quantify the normal intrasubject performance variability of four measures of phonatory function within and across sessions. Two different speaking tasks, syllable series and sentence production, were used to determine if more natural speaking tasks resulted in greater intrasubject variability. Vowel type ([i] versus [a]) also was varied. Estimated subglottal air pressure, mean phonatory air flow, abduction quotient, and fundamental frequency were derived from aerodynamic and electroglottographic signals obtained from 11 normally speaking men and 10 normally speaking women on four different days. Relative intrasubject variability was compared across speaking task, gender, and vowel type. Average across-session intrasubject variability was 5% for fundamental frequency and abduction quotient, 8% for estimated subglottal air pressure, and 15% for mean phonatory air flow during syllable repetition. There was significantly greater intrasubject variability for mean phonatory air flow and abduction quotient for the sentence repetition task. There were no significant differences in intrasubject variability across gender and vowel type. The data were used to compute cutoff values that represent the amount of variability that would be considered within normal limits. These normal data can be used for comparison when assessing and monitoring the phonatory abilities of individuals with voice disorders.

Acknowledgments
Portions of this paper were presented at the Annual Convention of the American Speech-Language-Hearing Association in Seattle (1990). We are grateful to Tom Creutz for designing the software for EGG analysis, Jo Peters for assisting with data management, David Chait for helping with subject recruitment, and W. S. Brown, Jr., Ray Colton, E. Thomas Doherty, and Wendy Lotz for reviewing an earlier version of this manuscript.
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