Intensive voice treatment (LSVT) for patients with Parkinson’s disease: a 2 year follow up
Journal of Neurology, Neurosurgery, and Psychiatry
Ramig L.O., Sapir S., Countryman S., Pawlas A.A., O’Brien C., Hoehn M., & Thompson L.L. (2001) Intensive voice treatment (LSVT) for patients with Parkinson’s disease: a 2 year follow up Journal of Neurology, Neurosurgery, and Psychiatry, 71(4), 493-8
This study examined 33 patients with idiopathic ParkinsonÕs disease (IPD) to assess long term (24 months) effects of the Lee Silverman voice treatment (LSVT), a method designed to improve vocal function in patients with Parkinson’s disease. The 33 patients with IPD were stratified and randomly assigned to two treatment groups. One group received the LSVT, which emphasizes high phonatory-respiratory effort (the sound made by the combination of breathing and the vibration of the vocal cords), and the other group received respiratory therapy (RET), which emphasizes high respiratory effort alone. The LSVT was significantly more effective than the RET in improving (increasing) sound pressure level and semitone standard deviation immediately post-treatment and maintaining those improvements at 2 year follow up. The findings provide evidence for the efficacy of the LSVT as well as the long-term maintenance of these effects in the treatment of voice and speech disorders in patients with idiopathic Parkinson’s disease.