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Collision and phonation threshold pressures before and after loud, prolonged vocalization in trained and untrained voices
Linköping University, Department of Clinical and Experimental Medicine, Speech and Language Pathology. Linköping University, Faculty of Health Sciences.
Department of Speech, Music and Hearing, KTH, Royal Institute of Technology, 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 Voice, ISSN 0892-1997, E-ISSN 1873-4588, Vol. 27, no 5, 527-530 p.Article in journal (Refereed) Published
Abstract [en]

The phonation threshold pressure (PTP) is defined as the lowest subglottal pressure needed for obtaining and sustaining vocal fold oscillation. It has been found to increase during vocal fatigue. In the present study, PTP is measured together with the threshold pressure needed for vocal fold collision; henceforth, the collision threshold pressure (CTP). PTP and CTP are compared before and after loud, prolonged vocalization in singer and nonsinger voices. Ten 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. Audio and electroglottography signals were recorded before and after this exercise. At the same time, oral pressure was registered while the subjects produced a diminuendo repeating the syllable /pa:/, thus acquiring an approximate of the subglottal pressure. CTP and PTP increased significantly after the vocal loading in the nonsinger subjects. On the other hand, singers reported no substantial effect of the exercise, and most singers had a mean after-to-before ratio close to 1 for both CTP and PTP.

Place, publisher, year, edition, pages
Elsevier, 2013. Vol. 27, no 5, 527-530 p.
Keyword [en]
Collision threshold pressure, phonation threshold pressure, electroglottography, vocal fatigue, vocal loading, prolonged vocalization, singing training, vocal training
National Category
Medical and Health Sciences
Identifiers
URN: urn:nbn:se:liu:diva-91359DOI: 10.1016/j.jvoice.2013.03.008ISI: 000324249700001OAI: oai:DiVA.org:liu-91359DiVA: diva2:617376
Available from: 2013-04-23 Created: 2013-04-23 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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