Efficacy of LSVT-LOUD Therapy on Voice, Speech, and Quality of Life in Parkinson's Disease

Overview

Parkinson's disease often causes speech and voice impairments, such as reduced vocal loudness and decreased speech intelligibility, which significantly impact the quality of life for patients and their families. The Lee Silverman Voice Therapy-LOUD (LSVT-LOUD) is a specialized, evidence-based speech therapy protocol designed to improve vocal function. This study investigates the effectiveness of the LSVT-LOUD protocol in Turkish-speaking individuals with Parkinson's disease. The research evaluates objective changes in vocal loudness and speech quality, as well as the subjective therapy experiences of participants. By analyzing both clinical outcomes and patient feedback, this study aims to contribute to the clinical application and adaptation of LSVT-LOUD for the Turkish-speaking population

This study implements the standardized Lee Silverman Voice Treatment (LSVT-LOUD) protocol, an intensive intervention focused on the recalibration of vocal effort through motor learning principles. The intervention requires participants to attend individual therapy sessions conducted four times per week over a four-week period, with each session lasting 60 minutes. The protocol emphasizes high-effort phonation and is structured into the following components: Daily Tasks: Sustained vowel phonation (maximum duration and stability), pitch range exercises (high-to-low and low-to-high glides), and maximum functional loudness drills using high-effort speech. Hierarchy Tasks: Systematic progression from word-level to sentence-level and, finally, conversational speech tasks, incorporating high-effort vocal production into increasingly complex linguistic structures. Carry-over Exercises: Daily practice assignments designed to facilitate the generalization of high-effort speech into activities of daily living and social interactions. Clinical instruction emphasizes the patient's sensory perception of vocal effort, using acoustic feedback to help participants recalibrate their internal perception of 'loud' versus 'normal' speech. The protocol is conducted in Turkish, adhering to the original LSVT-LOUD methodological requirements while accounting for linguistic nuances of the Turkish language.