The Effect of Exercise on Respiratory Resistance in Athletes With and Without Paradoxical Vocal Fold Motion Disorder
Purpose: An investigational, portable instrument was used to assess inspiratory (Ri) and expiratory (Re) resistances during resting tidal breathing (RTB), post-exercise breathing (PEB) and recovery breathing (RB) in athletes with and without paradoxical vocal fold motion disorder (PVFMD).
Method: Prospective, controlled, repeated-measures within-subject and between-group design. Twenty-four teenage female athletes, 12 with and 12 without PVFMD, breathed into the Airflow Perturbation Device (APD) for baseline measures of respiratory resistance, and for two successive 1-min trials after treadmill running for up to 12 min. Exercise duration and dyspnea ratings were collected and compared across groups.
Results: Athletes with PVFMD had lower than control Ri and Re values during RTB that significantly increased at PEB and decreased during RB. Control athletes' Re decreased significantly from RTB to PEB but not from PEB to RB, whereas Ri did not change from RTB to PEB but decreased from PEB to RB. Athletes without PVFMD ran longer providing lower dyspnea ratings.
Conclusion: Immediately following exercise, athletes with PVFMD experienced increased respiratory resistance that impacted their exercise performance. The difference in resting respiratory resistances between groups is intriguing and could point to anatomical differences or neural adaptation in teenagers with PVFMD. The APD appears to be a clinically feasible tool that can provide insight into PVFMD and objective data for tracking treatment progress.
Autor / Fonte:Sally K Gallena, Nancy Pearl Solomon, Arthur T Johnson, Jafar Vossoughi, Wei Tian American Journal of Speech-language Pathology 2015 May 22