Fundamental Frequency and Jitter Percent in MDVP and PRAAT

Mohammed, Ahmed A; Nagy, Ahmed

doi:10.1016/j.jvoice.2021.03.008

Cited by 8 publications

(2 citation statements)

References 18 publications

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“…NHR is the ratio between the periodic or harmonic components and the non-periodic or non-harmonic components of a voice. Notwithstanding, it is important to note that the values of the outcome variables may differ depending on the software used ( 37 ).…”

Section: Acoustic Voice Analysismentioning

confidence: 99%

The Elderly Voice: Mechanisms, Disorders and Treatment Methods

Beton¹,

Yücel²,

Başak³

et al. 2022

TAO

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The elderly population is increasing globally. In Turkey, the population aged 65+ is predicted to grow to more than 15% of the whole population by 2050. Just like the rest of the body, the voice also changes with age. Voice changes throughout life have been reported in up to 52.4% of aged individuals and may have a negative impact on their quality of life. Voice is affected by various factors, including age, disease, hormones, medications, and physiological, psychological, and social conditions. A multidisciplinary approach is therefore needed to achieve the best voice outcomes. In this review, we summarize the mechanisms involved in voice changes in the elderly together with the applicable diagnostic and treatment methods.

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Section: Acoustic Voice Analysismentioning

confidence: 99%

The Elderly Voice: Mechanisms, Disorders and Treatment Methods

Beton¹,

Yücel²,

Başak³

et al. 2022

TAO

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“…Changes in fundamental frequency can indicate alterations in vocal fold tension and length, which may occur as a result of thyroid surgery. The first formant frequency represents the resonance frequency of the vocal tract and is influenced by the configuration of the vocal tract [ 5 ]. Alterations in first formant frequency may indicate changes in vocal tract shape or size, which could occur due to surgical manipulation or tissue trauma during thyroidectomy.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Changes in the Quality of Voice in Post-thyroidectomy Patients With Intact Recurrent and Superior Laryngeal Nerve Function

Sahoo,

Gupta

et al. 2024

Cureus

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Background Thyroidectomy is a routinely performed surgical procedure used to treat benign, malignant, and some hormonal disorders of the thyroid that are not responsive to medical therapy. Voice alterations following thyroid surgery are well-documented and often attributed to recurrent laryngeal nerve dysfunction. However, subtle changes in voice quality can persist despite anatomically intact laryngeal nerves. This study aimed to quantify post-thyroidectomy voice changes in patients with intact laryngeal nerves, focusing on fundamental frequency, first formant frequency, shimmer intensity, and maximum phonation duration. Methodology This cross-sectional study was conducted at a tertiary referral center in central India and focused on post-thyroidectomy patients with normal vocal cord function. Preoperative assessments included laryngeal endoscopy and voice recording using a computer program, with evaluations repeated at one and three months post-surgery. Patients with normal laryngeal endoscopic findings underwent voice analysis and provided feedback on subjective voice changes. The PRAAT version 6.2 software was utilized for voice analysis. Results The study included 41 patients with normal laryngoscopic findings after thyroid surgery, with the majority being female (85.4%) and the average age being 42.4 years. Hemithyroidectomy was performed in 41.4% of patients and total thyroidectomy in 58.6%, with eight patients undergoing central compartment neck dissection. Except for one patient, the majority reported no subjective change in voice following surgery. Objective voice analysis showed statistically significant changes in the one-month postoperative period compared to preoperative values, including a 5.87% decrease in fundamental frequency, a 1.37% decrease in shimmer intensity, and a 6.24% decrease in first formant frequency, along with a 4.35% decrease in maximum phonatory duration. These trends persisted at the three-month postoperative period, although values approached close to preoperative levels. Results revealed statistically significant alterations in voice parameters, particularly fundamental frequency and first formant frequency, with greater values observed in total thyroidectomy patients. Shimmer intensity also exhibited slight changes. Comparison between hemithyroidectomy and total thyroidectomy groups revealed no significant differences in fundamental frequency, first formant frequency, and shimmer. However, maximum phonation duration showed a significantly greater change in the hemithyroidectomy group at both one-month and three-month postoperative intervals. Conclusions This study on post-thyroidectomy patients with normal vocal cord movement revealed significant changes in voice parameters postoperatively, with most patients reporting no subjective voice changes. The findings highlight the importance of objective voice analysis in assessing post-thyroidectomy voice outcomes.

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