Master of Arts (MA)


Communication Sciences and Disorders

Document Type



The Lee Silverman Voice Treatment (LSVT™) has received much attention in the past decade for its use in the treatment of individuals with Parkinson’s disease (Jones, 2005; Ramig, Countryman, O'Brien, Hoehn, & Thompson, 1996; Ramig, Sapir, Countryman et al., 2001; Wohlert, 2004). This intensive program requires therapy four times a week for four weeks in order to improve perceptual characteristics of the voice, such as loudness. However, since LSVT™ was introduced, the rehabilitation industry has experienced systematic reductions in allowable frequency and duration of covered services. The result has been that individuals often cannot qualify for the rigorous LSVT™ protocol (Centers for Medicare and Medicaid Services, 2008). The present study followed the standard treatment protocol but manipulated the dose of treatment to determine if a reduced dose of treatment would be effective for individuals with PD (IwPD) and dysarthria. Our treatment schedule used frequency, intensity, and duration variables that more closely mirrored the current state of clinical practice (e.g., 45 minutes, 2 times per week for 8 weeks). Two IwPD participated in the study and demonstrated improvements in maximum vocal SPL, but these gains were not maintained at a 6-month follow-up. Treatment outcomes indicated improvement in body structure/function as evidenced by increased vocal SPL by both participants across all three speech tasks. Speech intelligibility scores and communicative effectiveness ratings also improved for one participant. Results, though preliminary, indicated a reduced dosage of the LSVT™ protocol does exhibit treatment efficacy and treatment outcomes comparable to the original, intensive LSVT™ protocol, thus moving this treatment closer to determining the most clinically feasible and client-friendly version of LSVT™.



Document Availability at the Time of Submission

Release the entire work immediately for access worldwide.

Committee Chair

Donovan, Neila