Summary
Purpose
This preliminary study examined the influence of glottal fry on measurement of speaking
fundamental frequency (SF0) and whether sex differences influence the impact glottal fry has on SF0 and cepstral peak prominence (CPP). It was hypothesized that SF0 and CPP would decrease as percent glottal fry in the sample increased, with larger
changes observed in the female voice.
Methods
Twenty-six participants (13 men, 13 women) completed the study. Participants were
recorded reading the Rainbow Passage. SF0 and CPP were determined from the original sample. Percent glottal fry SF0 was determined and semitone change was recalculated after removal of glottal fry
from the sample. Regression analysis was used to determine the impact of glottal fry
and sex on semitone change and CPP differences in SF0.
Results
Significant differences were found for both sex and percent glottal fry on semitone
change in SF0. A significant relationship was not found between CPP and semitone change when sex
was accounted for.
Conclusions
Findings from this study indicate that the measurement of SF0 for women will decline as percent of glottal fry increases. These findings have clinical
implications for interpretation of SF0 measurement and evidence-based outcomes for voice therapy.
Key Words
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Article info
Publication history
Published online: November 09, 2016
Accepted:
October 6,
2016
Identification
Copyright
Published by Elsevier Inc. on behalf of The Voice Foundation.
