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Effects on vocal fold collision and phonation threshold pressure of resonance tube phonation with tube end in water
Linköping University, Department of Clinical and Experimental Medicine, Speech and Language Pathology. Linköping University, Faculty of Health Sciences.
KTH, Royal Institute of Technology, Stockholm, Sweden. (Department of Speech, Music and Hearing)
Speech-Language Pathologist, Stockholm, Sweden.
Linköping University, Department of Clinical and Experimental Medicine, Speech and Language Pathology. Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Anaesthetics, Operations and Specialty Surgery Center, Department of Otorhinolaryngology in Linköping.ORCID iD: 0000-0003-2208-0630
2013 (English)In: Journal of Speech, Language and Hearing Research, ISSN 1092-4388, E-ISSN 1558-9102, Vol. 56, 1530-1538 p.Article in journal (Refereed) Published
Abstract [en]

Purpose: Resonance tube phonation in water (RTPW) or in air is a voice therapy method successfully used for treatment of several voice pathologies. Its effect on the voice has not been thoroughly studied. This investigation analyzes the effects of RTPW on collision and phonation threshold pressures (CTP and PTP), the lowest subglottal pressure needed for vocal fold collision and phonation, respectively.

Method: Twelve mezzo-sopranos phonated into a glass tube, the end of which was placed under the water surface in a jar. Subglottal pressure, electroglottography and audio signals were recorded before and after exercise. Also, the perceptual effects were assessed in a listening test with an expert panel which also rated the subjects’ singing experience.

Results: Resonance tube phonation significantly increased CTP, and also tended to improve perceived voice quality. The latter effect was mostly greater in singers who did not practice singing daily. In addition, a more pronounced perceptual effect was found in singers rated as being less experienced.

Conclusion: Resonance tube phonation significantly raised CTP and tended to improve perceptual ratings of voice quality. The effect on PTP failed to reach significance.

Place, publisher, year, edition, pages
American Speech-Language-Hearing Association, 2013. Vol. 56, 1530-1538 p.
Keyword [en]
Collision threshold pressure, phonation threshold pressure, semi-occluded vocal tract, EGG, voice therapy, voice training
National Category
Medical and Health Sciences
Identifiers
URN: urn:nbn:se:liu:diva-87906DOI: 10.1044/1092-4388(2013/12-0040)ISI: 000328267300016OAI: oai:DiVA.org:liu-87906DiVA: diva2:600910
Available from: 2013-01-28 Created: 2013-01-28 Last updated: 2017-12-06Bibliographically approved
In thesis
1. Collision Threshold Pressure: A novel measure of voice function Effects of vocal warm-up, vocal loading and resonance tube phonation in water
Open this publication in new window or tab >>Collision Threshold Pressure: A novel measure of voice function Effects of vocal warm-up, vocal loading and resonance tube phonation in water
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The phonation threshold pressure (PTP), i.e., the smallest amount of subglottal pressure needed to initiate and sustain vocal fold oscillation, is frequently difficult to measure due to the difficulty for some subjects to produce extremely soft phonation. In addition, PTP values are often quite scattered. Hence, the collision threshold pressure (CTP), i.e., the smallest amount of subglottal pressure needed for vocal fold collision, was explored as a possible complement or alternative to PTP. Effects on CTP and PTP of vocal warm-up (Paper 1), resonance tube phonation with the tube end in water (Paper 2), and vocal loading (Paper 3) were investigated. With the aim to accelerate the CTP measurement process, comparisons were made between CTP values derived manually and those derived by several automatic or semi-automatic parameters (Paper 4).

Subjects were recorded at various F0 while phonating /pa:/-sequences, starting at medium loudness and continuing until phonation ceased. Subglottal pressure was estimated from oral pressure signals during the /p/ occlusion. Vocal fold contact was determined manually from the amplitude of the electroglottographic (EGG) signal (Papers 1 and 3) or its first derivative (dEGG) (Papers 2 and 4).

Recordings were made before and after exercise: (Paper 1) Vocal warm-up was carried out in the 13 singers’ own habitual way. (Paper 2) Twelve mezzo-sopranos phonated on /u:/ at various pitches for two minutes before post-recording, and 15 seconds before each additional F0, into a glass tube (l=27 cm, id=9 mm) at a water depth of 1-2 cm.

(Paper 3) Five trained singers and five untrained subjects repeated the vowel sequence /a,e,i,o,u/ at a Sound Pressure Level of at least 80 dB at 0.3 m for 20 minutes.

Statistically significant results: (Paper 1) CTP and PTP decreased after warm-up in the five female voices. CTP was found to be higher than PTP (about 4 H2O). Also, CTP had a lower coefficient of variation, suggesting that CTP is a more reliable measure than PTP. (Paper 2) CTP increased on average six percent after resonance tube phonation in water.

(Paper 3) CTP and PTP increased after the vocal loading in the untrained voices, with an average after-to-before ratio of 1.26 for CTP and 1.33 for PTP.

(Paper 4) Automatically derived CTP values showed high correlation with those obtained manually, from EGG spectrum slope, and from the visual displays of dEGG and of dEGG wavegram.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2013. 40 p.
Series
Linköping University Medical Dissertations, ISSN 0345-0082 ; 1322
National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:liu:diva-91365 (URN)978-91-7519-815-6 (ISBN)
Public defence
2013-05-24, Eken, Campus US, Linköpings universitet, Linköping, 09:00 (English)
Opponent
Supervisors
Available from: 2013-04-23 Created: 2013-04-23 Last updated: 2015-09-22Bibliographically approved

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Enflo, LauraMcAllister, Anita

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