Investigating Muscle Activation Patterns and Muscle Synergies Pre- and Post-Balance Training in Older Adults.

Area of Science:

• Neurology
• Biomechanics
• Gerontology

Background:

• Falls are a major concern in aging populations, often linked to balance impairments.
• Previous balance training studies focused on clinical measures, overlooking underlying neuromuscular irregularities.
• Understanding neural contributions to balance is crucial for effective rehabilitation.

Purpose of the Study:

• To quantify neuromuscular changes resulting from rehabilitative balance training in older adults.
• To investigate the effectiveness of balance training on muscle activation and synergies.
• To determine if muscle synergies can inform balance training protocols.

Main Methods:

• Surface electromyography (sEMG) recorded from eight lower limb muscles.
• Evaluated twenty-three healthy older adults and five stroke survivors.
• Analyzed muscle synergies using non-negative matrix factorization (NNMF) before and after six weeks of balance training.

Main Results:

• Significant changes in muscle synergies and activation patterns were observed post-balance training.
• Both healthy older adults and stroke survivors showed altered neuromuscular strategies.
• Muscle activation patterns adapted following the balance intervention.

Conclusions:

• Muscle activation and muscle synergies serve as quantifiable metrics for balance training.
• Findings indicate potential for using sEMG-derived measures to personalize rehabilitative strategies.
• This research provides a foundation for optimizing balance training in older adults to reduce fall risk.