Journal article
Measurement Reliability of Laryngeal Resistance and Mean Flow Rate in Pediatric Subjects
Journal of voice, Vol.34(4), pp.590-597
07/2020
DOI: 10.1016/j.jvoice.2019.02.005
PMID: 30792082
Abstract
Mean flow rate (MFR) and laryngeal resistance (R
) are sensitive to changes in glottal configuration and biomechanics. There is little reported on aerodynamic parameters in children. We conducted a pilot study to evaluate MFR and R
measurement reliability in a pediatric population using labial and mechanical interruption methods.
Thirty-nine subjects aged 4-17 performed 10 trials per method. For labial interruptions, subjects produced five labial plosives at a comfortable amplitude. For mechanical interruptions, subjects maintained a steady /α/ while a balloon valve interrupted their airflow five times for 250 milliseconds each. MFR was measured as the flow through the interruption device between interruptions. R
was calculated by dividing subglottal pressure (P
) by MFR. The primary outcome measures of this study were the coefficients of variation of MFR and R
. Paired t tests were used to compare each variable between the two methods. Pearson's correlation was used to analyze the relationship between each parameter and subject age.
Mean P
(t(38) = 2.966, P < 0.01) and R
(t(38)=3.563, P < 0.01) were higher for labial interruptions while mean MFR (t(38) = -2.036, P < 0.05) was lower. Intrasubject coefficients of variation were higher for the labial technique for both MFR (t(38) = 4.939, P < 0.001) and R
(t(38) = 3.439, P < 0.01) while there was no difference in P
variability (P = 0.260). Mean MFR and R
were related to age for both the labial (MFR: r = 0.588, P < 0.001; R
: r = -0.468, p = 0.003) and mechanical trials (MFR: r = 0.534, P < 0.001; R
: r = -0.496, P = 0.001). The coefficients of variation for R
were negatively correlated with age for both labial (r = -0.415, P = 0.009) and mechanical trials (r = -0.471, P = 0.002). MFR was only correlated in the labial trials (r = -0.514, P = 0.001) and P
was only correlated in the mechanical trials (r = -0.519, P = 0.001).
Differences in means and intrasubject variation are likely due to differences in task and measurement timing. Precision of MFR and R
measurement in pediatric subjects was higher for mechanical interruption; further exploration of this method and its clinical utility is warranted. Measurement of aerodynamic parameters may be a useful addition to pediatric voice assessment.
Details
- Title: Subtitle
- Measurement Reliability of Laryngeal Resistance and Mean Flow Rate in Pediatric Subjects
- Creators
- Austin J Scholp - University of Wisconsin–MadisonCalvin D Hedberg - University of Wisconsin–MadisonJim R Lamb - University of Wisconsin–MadisonMatthew R Hoffman - University of Wisconsin School of Medicine and Public HealthMaia N Braden - University of Wisconsin–MadisonJ Scott McMurray - University of Wisconsin–MadisonJack J Jiang - University of Wisconsin–Madison
- Resource Type
- Journal article
- Publication Details
- Journal of voice, Vol.34(4), pp.590-597
- DOI
- 10.1016/j.jvoice.2019.02.005
- PMID
- 30792082
- ISSN
- 0892-1997
- eISSN
- 1873-4588
- Grant note
- DOI: 10.13039/100000002, name: NIH, award: R01 DC008153; DOI: 10.13039/100007015, name: University of Wisconsin-Madison
- Language
- English
- Date published
- 07/2020
- Academic Unit
- Otolaryngology
- Record Identifier
- 9984366282802771
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