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An Exploratory Electromyography-Based Coactivation Index for the Cervical Spine
Peter Le1, Alexander Aurand1, Thomas M Best2
1The Ohio State University, Columbus.
Human Factors
|November 2, 2017
Summary
A new coactivation index for the neck effectively measures muscle effort during complex head movements. This tool quantifies neuromuscular effort in the cervical spine during dynamic, multiplanar motions.
Area of Science:
- Biomechanics
- Neuroscience
- Kinesiology
Background:
- Limited research exists on cervical spine coactivation, particularly during dynamic, multiplanar movements.
- Previous coactivation studies were restricted to sagittal/lateral planes or isometric exertions.
- A gap exists in methods for assessing cervical spine coactivation during complex, naturalistic head motions.
Purpose of the Study:
- To develop and validate an electromyography-based coactivation index for the cervical spine.
- To assess the index's effectiveness with complex dynamic head motions.
- To understand neuromuscular effort during naturalistic cervical spine movements.
Main Methods:
- Developed an electromyography-based coactivation index, adapting methods from lumbar spine research.
- Tested the index using a series of postures and speeds, including complex dynamic head motions.
- Applied the index without requiring a high-end biomechanical model.
Main Results:
- Complex motions, especially those involving twisting and higher speeds, demonstrated significantly higher coactivation magnitudes.
- Coupled movements (flexion and twisting) exhibited four to five times greater coactivation than uniplanar movements.
- Higher degrees of head control correlated with increased neuromuscular effort, as measured by the coactivation index.
Conclusions:
- The developed coactivation index successfully accommodates multiplanar and naturalistic cervical spine movements.
- The index effectively quantifies increased neuromuscular effort associated with demanding head control tasks.
- This index offers a valuable tool for analyzing the neuromuscular demands of various cervical spine activities.
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