Vocal Economy in Vocally Trained Actresses and Untrained Female Subjects
Guzmán Noriega, Marco
Cita de ítem
Journal of Voice, Vol. 27, No. 6, pp. 698-704
Artículo de publicación ISI
Summary: Objectives. Vocally trained actresses are expected to have more vocal economy than nonactresses.
Therefore, we hypothesize that there will be differences in the electroglottogram-based voice economy parameter
quasi-output cost ratio (QOCR) between actresses and nonactresses. This difference should remain across different
levels of intensity.
Methods. A total of 30 actresses and 30 nonactresses were recruited for this study. Participants from both groups were
required to sustain the vowels /a/, /i/, and /u/, in habitual, moderate, and high intensity levels. Acoustic variables such as
sound pressure level (SPL), fundamental frequency (F0), and glottal contact quotient (CQ) were obtained. The QOCR
was then calculated.
Results. There were no significant differences among the groups for QOCR. Positive correlations were observed for
QOCR versus SPL and QOCR versus F0 in all intensity levels. Negative correlation was found between QOCR and CQ
in all intensity levels. Considering the differences among intensity levels, from habitual to moderate and from moderate
to loud, only the CQ did not differ significantly. The QOCR, SPL, and F0 presented significant differences throughout
the different intensity levels.
Conclusion. The QOCR did not reflect the level of vocal training when comparing trained and nontrained female subjects
in the present study. Both groups demonstrated more vocal economy in moderate and high intensity levels owing to
more voice output without an increase in glottal adduction.