Muscle Strength, Balance, and Indoor Mobility in Oculopharyngeal Muscular Dystrophy: An Exploratory Canadian...

Area of Science:

• Neuromuscular Disorders
• Rehabilitation Science
• Clinical Outcome Assessments

Background:

• Oculopharyngeal muscular dystrophy (OPMD) is a rare neuromuscular disease characterized by dysphagia, ptosis, and proximal muscle weakness.
• Standardized clinical outcome assessments (COAs) for muscle strength and indoor mobility in OPMD are underutilized.
• Understanding factors influencing mobility is crucial for effective patient management and rehabilitation.

Purpose of the Study:

• To quantify muscle strength, balance, and indoor mobility in individuals with OPMD using standardized COAs.
• To identify key factors contributing to limitations in indoor mobility within the OPMD population.

Main Methods:

• A cross-sectional study involving 113 OPMD participants across four Canadian clinics.
• Utilized a battery of COAs including muscle testing, balance scales (ABC, Berg), and indoor mobility tests (10mWT, 30s-STS, 10-step stair test).
• Employed multiple linear regression with backward selection to analyze factors associated with indoor mobility outcomes.

Main Results:

• Participants exhibited reduced muscle strength (41.4%-81.4% of reference values), with hip flexors most affected.
• Indoor mobility tests also showed significant impairment (44.9%-83.3% of reference values).
• Balance, balance confidence, and lower limb muscle strength were identified as significant predictors for all indoor mobility measures, explaining 57.4%-79.9% of the variance.

Conclusions:

• This study establishes clinically relevant outcome measures for assessing mobility in OPMD.
• Identified balance and lower limb strength as critical targets for OPMD rehabilitation strategies.
• Findings can inform the selection of outcome measures for future OPMD intervention studies.