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Changes to respiratory kinematics associated with different cues to increase loudness in Parkinson’s disease.
Neeraja Sadagopan and Jessica E. Huber

We examined the effects of three different cues on loudness changes and respiratory support for loud speech in individuals with Parkinson’s disease (PD). Kinematic data from the rib cage and abdomen was collected using respiratory plethysmography (Respitrace), and acoustic, timing, and respiratory kinematic measurements were made for each loudness condition. Differences in the compliance characteristics of the rib cage and abdomen associated with increased rigidity of the chest wall in PD were evident from the termination data. For both PD and normal age- and sex-matched controls (EC), increased utterance length resulted in increased lung, rib cage, and abdominal initiations and excursions. In addition, vital capacity inspired was greater for longer utterances in both groups. However, individuals with PD demonstrated greater rib cage excursions than EC, but only for utterances longer than 20 syllables, suggesting that some effects specific to PD on respiratory support for speech may only be present for longer utterances. Interestingly, respiratory strategies used to support increased loudness did not vary no matter which type of cue was used to elicit loud speech.

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