A versatile approach to determine instantaneous co-activation: Development, implementation and comparison to existing...

Area of Science:

• Biomechanics
• Neuromuscular Physiology
• Computational Modeling

Background:

• Muscle co-activity analysis is crucial for understanding movement and injury.
• Existing co-activity measures may lack sensitivity or adaptability.
• Quantifying muscle responses during dynamic events like impacts is challenging.

Purpose of the Study:

• To present an adaptable method for computing muscle co-activity.
• To introduce a novel co-activation measure, Φ, derived from muscle activity dimensions.
• To evaluate the performance of Φ against existing measures.

Main Methods:

• Reducing instantaneous muscle activities into commonality and activity level dimensions.
• Independently weighting these dimensions to form the co-activation measure, Φ.
• Analyzing myoelectric data from simulated relaxed and braced rear vehicle impacts.

Main Results:

• The novel co-activation measure, Φ, showed greater sensitivity in muscle pair analyses.
• Φ demonstrated superior ability to discriminate between relaxed and braced conditions in multi-muscle scenarios.
• The adaptability of Φ allowed for tailored application based on specific research needs.

Conclusions:

• The presented adaptable method and co-activation measure (Φ) offer enhanced capabilities for analyzing muscle synergies.
• Φ provides a more sensitive and discriminative approach compared to previous co-activity measures.
• The flexibility of Φ makes it a valuable tool for diverse biomechanical and neuromuscular studies.