Humming Facilitates a Gradual Increase in Vocal Intensity by Alleviating the Enhancement of Vocal Fold Contact and Supraglottic Constriction

2019 ◽  
Author(s):  
Tom de Hoop ◽  
Makoto Ogawa ◽  
Toshihiko Iwahashi ◽  
Masanori Umatani ◽  
Kiyohito Hosokawa ◽  
...  
Keyword(s):  
Vocal Fold ◽  
Gradual Increase ◽  
Vocal Intensity

Comments on the Myoelastic - Aerodynamic Theory of Phonation

1980 ◽  
Vol 23 (3) ◽  
pp. 495-510 ◽  
Author(s):  
Ingo R. Titze
Keyword(s):  
Vocal Fold ◽  
Vocal Tract ◽  
Driving Forces ◽  
Vibrational Amplitude ◽  
Subglottal Pressure ◽  
Vertical Displacements ◽  
Vocal Intensity ◽  
Tissue Deformations ◽  
Chest Voice ◽  
Phase Differences

The myoelastic-aerodynamic theory of phonation has been quantified and tested with mathematical models. The models suggest that vocal fold oscillation is produced as a result of asymmetric forcing functions over closing and opening portions of the glottal cycle. For nearly uniform tissue displacements, as in falsetto voice, the asymmetry in the driving forces can result from the inertia of the air moving through the glottis. This inertia can in turn be enhanced or suppressed by supraglottal or subglottal vocal tract coupling. More obvious and pronounced asymmetries in the driving forces are associated with non-uniform vocal fold tissue displacements. These are combinations of normal tissue modes, and can result in vertical and horizontal phase differences along the surfaces, as observed in chest voice. The ranges of oscillation increase among various models as more freedom in the simulated tissue movement is incorporated. Of particular significance in initiating and maintaining oscillation are the vertical motions that facilitate coupling of aerodynamic energy into the tissues and allow tissue deformations under conditions of incompressibility. Vertical displacements also can have a significant effect on vocal tract excitation. Control of fundamental frequency of oscillation (FO) is basically myoelastic, partially as a result of deliberate or reflex adjustments of laryngeal muscles, and partially as a result of nonlinear tissue strain over the vibrational cycle. This places limits on the control of FO by subglottal pressure, and forces such control to be inseparably connected with vibrational amplitude, or less directly, with vocal intensity.

Aerodynamic Mechanisms Underlying Treatment-Related Changes in Vocal Intensity in Patients With Parkinson Disease

1996 ◽  
Vol 39 (4) ◽  
pp. 798-807 ◽  
Author(s):  
Lorraine Olson Ramig ◽  
Christopher Dromey
Keyword(s):  
Parkinson Disease ◽  
Sound Pressure Level ◽  
Vocal Fold ◽  
Sound Pressure ◽  
Maximum Flow ◽  
Pressure Level ◽  
Syllable Repetition ◽  
Before And After ◽  
Subglottal Pressure ◽  
Vocal Intensity

The purpose of this study was to document changes in aerodynamic and glottographic aspects of vocal function in patients with Parkinson disease who received two forms of high effort treatment. Previous reports (Ramig, Countryman, Thompson, & Horii, 1995) have documented increased sound pressure level (SPL) following treatment that trained phonation and respiration (Lee Silverman Voice Treatment: LSVT), but not for treatment that trained respiration only (R). In order to examine the mechanisms underlying these differences, measures of maximum flow declination rate (MFDR) and estimated subglottal pressure (Psub) were made before and after treatment. A measure of relative vocal fold adduction (EGGW) was made from the electroglottographic signal during sustained vowel phonation. Sound pressure level data from syllable repetition, sustained vowel phonation, reading, and monologue tasks were also analyzed to allow a more detailed understanding of treatment-related change in several contexts. Consistent with increases in SPL, significant increases in MFDR, estimated Psub, and EGGW were measured posttreatment in patients who received the LSVT. Similar changes were not observed following R treatment. These findings suggest that the combination of increased vocal fold adduction and subglottal pressure is a key in generating posttreatment increases in vocal intensity in idiopathic Parkinson disease (IPD).

Changes in the male voice at puberty: vocal fold length and its relationship to the fundamental frequency of the voice

1998 ◽  
Vol 112 (5) ◽  
pp. 451-454 ◽  
Author(s):  
Meredydd Harries ◽  
Sarah Hawkins ◽  
Jeremy Hacking ◽  
Ieuan Hughes
Keyword(s):  
Fundamental Frequency ◽  
Vocal Fold ◽  
Gradual Increase ◽  
Vocal Folds ◽  
Frequency Change ◽  
Male Voice ◽  
Pubertal Stage ◽  
Sudden Drop ◽  
Ultrasound Measurements ◽  
The Voice

AbstractUltrasound measurements of the vocal folds were taken for a number of boys passing through puberty. The boys were grouped according to their pubertal stage as defined by Tanner and there was a gradual increase in the length of the vocal folds as puberty progressed. The fundamental frequency of the boys' speaking voice was recorded via laryngography and a good correlation between the length of the vocal folds and the frequency of the voice was seen. The sudden drop in frequency seen between Tanner stages 3 and 4 did not correlate with similar changes in the length of the vocal folds at this time but stroboscopic findings suggest a change in the structure and mass of the vocal folds at this time of maximum frequency change.

Maximum vocal intensity as a primary outcome measure in unilateral vocal fold paralysis patients

2020 ◽  
pp. 1-9
Author(s):  
S F Johari ◽  
M Azman ◽  
A S Mohamed ◽  
M M Baki
Keyword(s):  
Vocal Fold ◽  
Primary Outcome ◽  
Outcome Measure ◽  
Vocal Fold Paralysis ◽  
Voice Handicap Index ◽  
Injection Laryngoplasty ◽  
Unilateral Vocal Fold Paralysis ◽  
Post Intervention ◽  
Surgical Interventions ◽  
Vocal Intensity

Abstract Objective To evaluate voice intensity as the primary outcome measurement when treating unilateral vocal fold paralysis patients. Methods This prospective observational study comprised 34 newly diagnosed unilateral vocal fold paralysis patients undergoing surgical interventions: injection laryngoplasty or medialisation thyroplasty. Voice assessments, including maximum vocal intensity and other acoustic parameters, were performed at baseline and at one and three months post-intervention. Maximum vocal intensity was also repeated within two weeks before any surgical interventions were performed. The results were compared between different time points and between the two intervention groups. Results Maximum vocal intensity showed high internal consistency. Statistically significant improvements were seen in maximum vocal intensity, Voice Handicap Index-10 and other acoustic analyses at one and three months post-intervention. A significant moderate negative correlation was demonstrated between maximum vocal intensity and Voice Handicap Index-10, shimmer and jitter. There were no significant differences in voice outcomes between injection laryngoplasty and medialisation thyroplasty patients at any time point. Conclusion Maximum vocal intensity can be applied as a treatment outcome measure in unilateral vocal fold paralysis patients; it can demonstrate the effectiveness of treatment and moderately correlates with self-reported outcome measures.

scholarly journals The Reliability of Vocal Intensity and Pitch Range in Unilateral Vocal Fold Palsy Patients

2021 ◽  
Vol 3 (5) ◽  
pp. 94-100
Author(s):  
Siti Nurfarhana Mohd Arif ◽  
Mawaddah Azman ◽  
Sharifa Ezat Wan Puteh ◽  
Nur Shahrina Mohd Zawawi ◽  
Abdullah Sani ◽  
...  
Keyword(s):  
Vocal Fold ◽  
Pitch Range ◽  
Vocal Fold Palsy ◽  
Vocal Intensity

scholarly journals Impact of hydration on vocal loading using phonetogram measures

2021 ◽  
Vol 7 (8) ◽  
pp. 1317
Author(s):  
Sujan Ghosh ◽  
Indranil Chatterjee ◽  
Piyali Kundu ◽  
Susmi Pani ◽  
Suman Kumar ◽  
...  
Keyword(s):  
Fundamental Frequency ◽  
Vocal Fold ◽  
Negative Impact ◽  
Vocal Folds ◽  
Graphical Display ◽  
Male And Female ◽  
Range Profile ◽  
Vocal Intensity ◽  
Voice Range ◽  
The Voice

<p><strong>Background:</strong> Vocal loading is a phenomenon that affects the vocal folds and voice parameters. Prolonged vocal loading may cause vocal fatigue. Hydration is one of the easiest precautions to reduce the effect of vocal loading. Voice range profile is an analysis of a participant’s vocal intensity and fundamental frequency ranges. Speech range profile is a graphical display of frequency intensity interactions occurring during functional speech activity. Phonetogram software can analyse VRP and SRP.</p><p><strong>Methods:</strong> Total sixty normophonic participants (thirty male and thirty female) were included in this study. Phonetogram, version 4.40 by Tiger DRS, software used to measure the voice range profile and speech range profile. For VRP, participants were asked to produce vowel /a/ and a passage reading task was given for SRP measurement.</p><p><strong>Results:</strong> All sample recording were done at pre vocal loading task, VLT and after hydration. Parameter that were used to measure the effects were Fo-range, semitone, max-F, min-F, SPL range, max-I, min-I, area (dB). Result showed that after VLT all other parameters like Fo-range, semitone, max-F, min-F, SPL range, max-I, min-I, area (dB) in VRP and SRP were reduced except min-F VRP in male, min-I VRP and min-I SRP in both male and female participants. After hydration all other parameters were improved except max-F VRP and min-F VRP in female, max-I VRP, min-F VRP and area VRP.</p><p><strong>Conclusions:</strong> This study concluded that vocal loading has negative impact on vocal fold tissue and mass. </p>

The Role of Adjustment of Expiratory Effort in the Control of Vocal Intensity: Clinical Assessment of Phonatory Function

2005 ◽  
Vol 132 (4) ◽  
pp. 641-646 ◽  
Author(s):  
Kiyoshi Makiyama ◽  
Hidetaka Yoshihashi ◽  
Manabu Mogitate ◽  
Akinori Kida
Keyword(s):  
Vocal Fold ◽  
Airway Resistance ◽  
Vocal Cord Paralysis ◽  
Vocal Folds ◽  
Control Group ◽  
Loading Test ◽  
Reinke’S Edema ◽  
Vocal Intensity ◽  
The Voice

OBJECTIVE: To determine the role of the adjustment of expiratory effort in the control of vocal intensity. STUDY DESIGN: An intensity-loading test was performed by using the airway interruption method. Three groups of subjects were used: a control group thought to resemble normal vocal fold closure, a group of patients with Reinke's edema thought to represent increased mass at the level of the vocal folds, and a group with vocal fold paralysis that was thought to represent a group with lack of adequate vocal fold closure. RESULTS: In the control group, expiratory lung pressure and airway resistance slightly increased. In the patients with Reinke's edema, expiratory lung pressure, and airway resistance significantly increased. In this group, the voice intensity was controlled by laryngeal adjustment, but a greater expiratory effort was needed because of a greater increase in glottal resistance. In the patients with vocal cord paralysis, airway resistance did not increase even with a high-intensity voice. Vocal intensity was controlled by expiratory effort. CONCLUSIONS: If there is sufficient ability for laryngeal adjustment, vocal intensity is controlled primarily by laryngeal adjustment and by expiratory adjustment in response to increased glottal resistance. However, vocal intensity is controlled by expiratory effort when laryngeal adjustment ability is poor.

Functional Differences between the Two Bellies of the Cricothyroid Muscle

1998 ◽  
Vol 118 (5) ◽  
pp. 714-722 ◽  
Author(s):  
Ki Hwan Hong ◽  
MING YE ◽  
Young Mo Kim ◽  
Kevin F. Kevorkian ◽  
Jody Kreiman ◽  
...  
Keyword(s):  
Vocal Fold ◽  
Vocal Folds ◽  
Cricothyroid Muscle ◽  
Functional Differences ◽  
Forward Translation ◽  
Pars Recta ◽  
Vocal Intensity ◽  
Clinically Significant ◽  
Main Factor

The contraction of the cricothyroid (CT) muscle, which results in a decrease in the distance between the thyroid and cricoid cartilages, is considered to be the main factor in lengthening the vocal folds. This is achieved by rotation of the CT joint. The CT muscle is composed of two distinct bellies, the pars recta and the pars obliqua. The function of each subunit is not clearly understood, although it is believed that they act differently because their fibers run in different directions. To clarify the function of the two bellies in phonation, the fundamental frequency (F0), vocal intensity, subglottic pressure, vocal fold length, and CT distance were measured using an in vivo canine laryngeal model. On the basis of these measurements, we demonstrated that the two bellies are varied in their effect on raising the pitch, rotation, and forward translation of the CT joint. The stimulation of the pars recta nerve resulted in a greater increase in the F0 value compared with that of pars obliqua. The combined activity of the pars recta and pars obliqua is important in adjustment of the vocal fold length. The CT approximations directed parallel to the pars recta and pars obliqua simultaneously were more effective in elevation of the pitch than the approximation placed parallel to the pars recta only. This finding may be clinically significant with regard to CT approximation thyroplasty in human trails. (Otolaryngol Head Neck Surg 1998;118:714–22.)

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