Research Article| Volume 27, ISSUE 5, P527-530, September 2013

Collision and Phonation Threshold Pressures Before and After Loud, Prolonged Vocalization in Trained and Untrained Voices

  • Laura Enflo
    Address correspondence and reprint requests to Laura Enflo, Department of Speech, Music and Hearing, KTH Royal Institute of Technology, Lindstedtsvägen 24, SE-10044 Stockholm, Sweden.
    Department of Clinical and Experimental Medicine, Linköping University, Linköping, Sweden

    Department of Speech, Music and Hearing, KTH Royal Institute of Technology, Stockholm, Sweden
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  • Johan Sundberg
    Department of Speech, Music and Hearing, KTH Royal Institute of Technology, Stockholm, Sweden
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  • Anita McAllister
    Department of Clinical and Experimental Medicine, Linköping University, Linköping, Sweden
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      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.

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        • Gray S.D.
        • Hammond E.
        • Hanson D.F.
        Benign pathologic responses of the larynx.
        Ann Otol Rhinol Laryngol. 1995; 104: 13-18
        • Verdolini K.
        • Rosen C.A.
        • Banski R.C.
        Classification Manual for Voice Disorders-I. Special Interest Division 3, Voice and Voice Disorders, ASHA.
        Lawrence Erlbaum Associates, Inc Publishers, Mahwah, NJ2006
      1. Lehto L. Occupational voice—studying voice production and preventing voice problems with special emphasis on call-centre employees. Ph.D. Thesis. Helsinki University of Technology, Laboratory of Acoustics and Audio Signal Processing; 2007.

        • Miller M.K.
        • Verdolini K.
        Frequency and risk factors for voice problems in teachers of singing and control subjects.
        J Voice. 1995; 9: 348-362
        • Fritzell B.
        Voice disorders and occupations.
        Logoped Phoniatr Vocol. 1996; 21: 7-12
        • Mattiske J.A.
        • Oates J.M.
        • Greenwood K.M.
        Vocal problems among teachers: a review of prevalence, causes, prevention, and treatment.
        J Voice. 1998; 12: 489-499
        • Simberg S.
        • Sala E.
        • Vehmas K.
        • Laine A.
        Changes in the prevalence of vocal symptoms among teachers during a twelve-year period.
        J Voice. 2005; 19: 95-102
        • Lyberg Åhlander V.
        • Rydell R.
        • Löfqvist A.
        Speaker's comfort in teaching environments: voice problems in Swedish teaching staff.
        J Voice. 2011; 25: 430-440
        • Long J.
        • Williford H.N.
        • Scharff Olson M.
        • Wolfe V.
        Voice problems and risk factors among aerobic instructors.
        J Voice. 1998; 12: 197-207
        • Heidel S.E.
        • Torgerson J.K.
        Vocal problems among aerobic instructors and aerobic participants.
        J Commun Disord. 1993; 26: 179-191
        • Södersten M.
        • Granqvist S.
        • Hammarberg B.
        • Szabo A.
        Vocal behavior and vocal loading factors for preschool teachers at work studied with binaural DAT recordings.
        J Voice. 2002; 16: 356-371
        • Vilkman E.
        Occupational safety and health aspects of voice and speech professions.
        Folia Phoniatr Logop. 2004; 56: 220-253
        • Laukkanen A.M.
        • Kankare E.
        Vocal loading-related changes in male teachers' voices investigated before and after a working day.
        Folia Phoniatr Logop. 2006; 58: 229-239
        • Laukkanen A.M.
        • Ilomäki I.
        • Leppänen K.
        • Vilkman E.
        Acoustic measures and self-reports of vocal fatigue by female teachers.
        J Voice. 2008; 22: 283-289
        • Ilomäki I.
        • Mäki E.
        • Laukkanen A.M.
        Vocal symptoms among teachers with and without voice education.
        Logoped Phoniatr Vocol. 2005; 30: 171-174
        • Lehto L.
        • Alku P.
        • Bäckström T.
        • Vilkman E.
        Voice symptoms of call-centre customer service advisers experienced during a work-day and effects of a short vocal training course.
        Logoped Phoniatr Vocol. 2005; 30: 14-27
        • Titze I.
        Phonation threshold pressure: a missing link in glottal aerodynamics.
        J Acoust Soc Am. 1992; 91: 2926-2935
        • Solomon N.P.
        • DiMattia M.S.
        Effects of a vocally fatiguing task and systematic hydration on phonation threshold pressure.
        J Voice. 2000; 14: 341-362
        • Milbrath R.L.
        • Solomon N.P.
        Do vocal warm-up exercises alleviate vocal fatigue?.
        J Speech Hear Res. 2003; 46: 422-436
        • Chang A.
        • Karnell M.P.
        Perceived phonatory effort and phonation threshold pressure across a prolonged voice loading task: a study of vocal fatigue.
        J Voice. 2004; 18: 454-466
        • Enflo L.
        • Sundberg J.
        Vocal fold collision threshold pressure: an alternative to phonation threshold pressure?.
        Logoped Phoniatr Vocol. 2009; 34: 210-217
        • McHenry M.
        • Johnson J.
        • Foshea B.
        The effect of specific versus combined warm-up strategies on the voice.
        J Voice. 2009; 23: 572-576
      2. Enflo L, Sundberg J, Romedahl C, McAllister A. Effects on vocal fold collision and phonation threshold pressure of resonance tube phonation with tube end in water. J Speech Lang Hear Res. In Press

      3. Enflo L, Sundberg J, Pabst F. Collision threshold pressure before and after vocal loading. In Proceedings of Interspeech. Brighton. 2009; 780–783