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KMID : 1036820190240030785
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Communication Sciences & Disorders
2019 Volume.24 No. 3 p.785 ~ p.799
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Effects of Lax Vox Voice Therapy on Respiration and Phonation in Patients with Parkinson’s Disease
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Chae Hye-Rim
Choi Seong-Hee
Choi Chul-Hee
Lee Kyung-Jae
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Abstract
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Objectives: Parkinson’s disease (PD) is a degenerative disease of the central nervous system that mainly affects sensory and motor function. PD patients have difficulty in controlling their vocal pitch and loudness, and poor self-monitoring due to their sensory disorder. Among semi-occluded vocal tract exercises, Lax Vox is a holistic method that provides bio-feedback by focusing on the interaction of breathing, resonance, and phonation by tube phonation in water. The purpose of this study was to investigate the effect of Lax Vox voice therapy on respiration and phonation in patients with PD.
Methods: Ten patients with PD (4 males and 6 females) underwent Lax Vox voice therapy six times a week for 6 weeks. To assess the effectiveness of Lax Vox voice therapy, aerodynamic, acoustic evaluation, GRBAS scale, electroglottography, and Korean Voice Handicap Index (KVHI)-10 were performed before and after voice therapy.
Results: Significant improvement in aerodynamic, acoustic, auditory-perceptual rating measures, and KVHI-10 score was yielded following Lax Vox voice therapy. After treatment, significantly increased vital capacity (VC) and maximum phonation time (MPT); and reduced subglottal pressure (Psub) were observed. Cepstral peak prominence (CPP) was significantly increased and smoothed pitch perturbation quotient (sPPQ), vF0, shimmer, amplitude perturbation quotient (APQ), smoothed APQ (sAPQ), peak-amplitude variation (vAm) were significantly decreased after treatment. Moreover, Voice Range Profile (VRP) was extended and KVHI-10 scored significantly lower.
Conclusion: Current outcomes confirmed that significantly positive effects were found in respiration and phonation change following Lax Vox voice therapy for patients with PD. Therefore, Lax Vox voice therapy, in addition to Lee Silverman Voice Treatment, can be useful for an effective treatment option in patients with PD.
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KEYWORD
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Parkinson’s disease, Motor and sensory disorder, Lax Vox voice therapy, Semi-occluded vocal tract exercises (SOVTE)
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