Related Experiment Video
Updated: Oct 4, 2025

Foreign Accent and Forensic Speaker Identification in Voice Lineups: The Influence of Acoustic Features Based on Prosody
Published on: September 27, 2024
Effect of delivery mode on objective and subjective aspects of voice
1Department of Obstetrics and Gynecology, Hitit University School of Medicine, Çorum, Turkey. dr.ozgur@hotmail.com.
Objective:
This study aimed to compare the effect of delivery on both objective and subjective parameters of voice.
Patients And Methods:
This is a prospective parallel-group randomized controlled trial. 105 women grouped in two; vaginal delivery (NG) and cesarean group (CG). The fundamental frequency (F0), jitter, shimmer, noise-to-harmonics ratio (NHR), number of voice breaks (VBn) and percentage of voice breaks (VB%) were determined in acoustic analysis. Voice Handicap Index 30 (VHI) was used for subjective analysis.
Results:
In NG, a significant decrease in jit%, shim% and VB% was observed (p <.05). In CG, all parameters including F0 showed a significant decrease in early postpartum period (p <.05). CG had more significant improvement in F 0, jit%, shim%, shimdB, VB%, VBn according to test statistics values. VHI scores increased in both NG and CG.
Conclusions:
The change of objective parameters was more significant in CG. Vaginal delivery may cause vocal trauma which results in deterioration in objective acoustic measures as well as decrease in subjective voice quality.
Related Concept Videos
Larynx
Anatomy of the Larynx
The larynx consists of various components, including cartilage, muscles, and vocal cords. Its structure includes three large unpaired cartilages—the thyroid, cricoid, and epiglottis—and three smaller paired cartilages—the arytenoids,...
Factors Affecting Perception
An illustrative example of a perceptual set is the scenario where an airline pilot told...
Therapeutic Communication
Verbal communication depends on language or a prescribed way of using words so that people can share information effectively. The critical aspects of verbal...
Doppler Effect - II
Non-Verbal Cues
Perception of Sound Waves
The pitch of a sound depends on the frequency and the pressure amplitude of the source. Two sounds of the same...

