Voice was evaluated using the voice-related quality of life (V-RQOL) questionnaire, perceptual evaluations of voice quality by speech-language pathologists using the GRBAS (grade of hoarseness, roughness, breathiness, asthenia, strain) scale, and acoustic analysis (fundamental frequency, maximal phonation time, and relative average perturbation) using the Visi-Pitch II 3300.
Outcome measures included mean airflow rate, intensity in dB sound pressure level (SPL), maximum phonation time, and self-report of voice handicap.
The DSI is based on the weighted combination of the following set of voice measurements: maximum phonation time (MPT), highest frequency, lowest intensity, and jitter.
Eighteen students enrolled in an Australian tertiary 3-year acting program (nine male and nine female) were assessed at the beginning of their acting course and again 12 months later using a questionnaire, interview, maximum phonation time (MPT), reading, spontaneous speaking, sustained phonation tasks, and a pitch range task.
The primary objectives of this study were to determine the intrasubject reliability of repeated measures of maximum phonation time (MPT) duration during a single session and to examine the effects of age, sex, and total phonatory airflow on this reliability.
Acoustic and aerodynamic parameters were recorded, including fundamental frequency (F0), intensity, jitter, shimmer, signal-to-noise ratio (SNR), oral airflow (OAF), maximum phonation time (MPT), and estimated subglottic pressure (ESGP).
Voice acoustic analysis including fundamental frequency (F0), jitter, shimmer, harmonics-to-noise ratio (HNR), and maximum phonation time (MPT) can now be easily recorded and analyzed using a computer.
Conclusion: In asthmatic patients, maximum phonation time, frequency, and amplitude perturbation parameters were impaired, but the vital capacity and the duration of illness did not correlate with these findings.
The following voice parameters were evaluated: maximum phonation time (MPT), mean airflow rate (MFR), subglottic pressure (Psub), closed quotient (CQ), irregularity of frequency percentage (CFx), irregularity of amplitude percentage (CAx), average fundamental frequency (F0), noise-to-harmonic ratio (NHR), jitter percentage, and shimmer percentage.
The average maximal phonation times were similar for the two groups (7.8 s for patients and 7.4 s for controls) but lower than average normal scores reported in the literature.
Maximum phonation time (MPT), a clinical measurement of the longest time one can phonate a vowel, typically /a/, is a frequently used measure of vocal function, but normative data are lacking for MPT in healthy older adults.
