Expiratory Muscle Training and Trunk Flexion in Parkinson's Disease

Exclusion Criteria

• •Severe dyskinesia or "on-off" fluctuations
• •Change in the PD medication in the last 3 months prior to enrollment
• •History of major spinal surgery or musculoskeletal spinal disorders
• •Need for assistive devices when rising from a chair or bed
• •Other neurological, orthopedic, or cardiovascular comorbidities that could affect postural control
• •Inadequate lip seal.