Background: Temporal variations during the pitch have demonstrated significant impacts on the kinetic chain, and as such, have implications in injury risk.
Purpose: To determine the effect of varying chronological orders of maximum joint and segment velocities on ball velocity and upper extremity kinetics.
Methods: Professional baseball pitchers (n = 287) were assessed with 3D-motion capture (480 Hz) while pitching.
J Speech Lang Hear Res
March 2021
Purpose The goal of this study was to present vocal aerodynamic measurements from pediatric and adult participant pools. There are a number of anatomical changes involving the larynx and vocal folds that occur as children age and become adults. Data were collected using two methods of noninvasive aerodynamic assessment: mechanical interruption and labial interruption.
View Article and Find Full Text PDFIntroduction: Measures of subglottal pressure (Ps), phonation threshold pressure (PTP), and laryngeal resistance (LR) can be used as indicators of vocal cord disorders. The gold standard non-invasive measurement uses labial interruption, which has been shown to have reliability inconsistencies. Mechanical interruption methods have demonstrated promise in measurement reliability.
View Article and Find Full Text PDFObjectives: The aim of this study is to explore the effects of the angle of epiglottis (Aepi) on phonation and resonance in excised canine larynges.
Methods: The anatomic Aepi was measured for 14 excised canine larynges as a control. Then, the Aepis were manually adjusted to 60° and 90° in each larynx.
Objective: 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.
View Article and Find Full Text PDFObjectives/hypothesis: Phonation threshold pressure (PTP), the minimum subglottal pressure (P ) required for phonation, is sensitive to changes in laryngeal biomechanics and is often elevated with pathology. Little is reported on PTP in children; challenges with task performance and measurement reliability represent barriers to routine clinical assessment.
Study Design: Pilot study evaluating PTP and P measurement reliability in children using labial and mechanical interruption.