Biofeedback effectiveness to reduce upper limb muscle activity during computer work is muscle specific and time...

Area of Science:

• Ergonomics and Occupational Health
• Neuroscience
• Rehabilitation Medicine

Background:

• Continuous electromyographic (EMG) activity is a risk factor for muscle disorders.
• EMG biofeedback can reduce muscle activity during computer tasks.
• Understanding targeted biofeedback efficacy is crucial for preventing work-related musculoskeletal disorders.

Purpose of the Study:

• To investigate the effectiveness of unilateral EMG biofeedback on bilateral trapezius (TRA) and extensor digitorum communis (EDC) muscle activity.
• To compare the efficacy of biofeedback from homologous versus remote muscles.
• To assess the influence of time constraints on biofeedback effectiveness.

Main Methods:

• Eleven healthy women performed computer work under time-constrained and non-time-constrained conditions.
• EMG biofeedback was applied to the right TRA or EDC muscle using visual or auditory modes.
• Muscle activity was measured using EMG and mechanomyography, with control sessions for comparison.

Main Results:

• Biofeedback from TRA significantly reduced activity in both right (30%) and left (50%) TRA muscles compared to controls.
• Biofeedback from EDC reduced EDC activity by approximately 10% compared to controls.
• Biofeedback was effective under time constraints, reducing muscle activity in TRA and EDC.

Conclusions:

• EMG biofeedback effectively reduces muscle activity when applied to the homologous or bilateral muscle, but not when applied to a remote muscle.
• Biofeedback is significant in time-constrained conditions, suggesting its utility in demanding work environments.
• Targeting biofeedback to the most affected muscle is recommended for occupational pain relief and prevention.