EMG-based Indicators of Muscular Co-Activation during Gait in Children with Duchenne Muscular Dystrophy

Area of Science:

• Biomedical Engineering
• Neuromuscular Disorders
• Gait Analysis

Background:

• Duchenne Muscular Dystrophy (DMD) is characterized by progressive muscular weakness.
• Motor function in DMD patients often shows impaired coordination and muscle activation patterns.
• Understanding these neuromuscular changes is crucial for managing the disease.

Purpose of the Study:

• To investigate the relationship between surface EMG activity, muscle co-activation, and gait kinematics in children with DMD.
• To evaluate how disease progression and pharmacological treatment influence muscle co-activation patterns.
• To correlate changes in muscle co-activation with specific markers of motor function during gait.

Main Methods:

• Surface electromyography (EMG) of lower limb muscles was recorded in 10 children with DMD.
• Kinematic data during unconstrained gait was collected concurrently.
• Co-activation indexes for agonist-antagonist muscle pairs were calculated and linked to kinematic gait parameters.

Main Results:

• A significant decrease in co-activation indexes was observed for two agonist-antagonist muscle pairs.
• This decrease in co-activation was associated with disease progression and pharmacological treatment.
• For one muscle pair, reduced co-activation correlated with a decline in gait motor function.

Conclusions:

• Muscle co-activation patterns are altered in children with Duchenne Muscular Dystrophy.
• Disease progression and treatment impact these neuromuscular control strategies.
• Impaired co-activation may serve as a biomarker for motor function deficits in DMD.