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A non-MVC EMG normalization technique for the trunk musculature: Part 1. Method development
1The Biodynamics Laboratory, The Ohio State University, 210 Baker Systems, 1971 Neil Avenue, Columbus, OH 43210, USA. marras.1@osu.edu
Summary
This study introduces a new electromyography (EMG) normalization method using sub-maximal exertions and anthropometric data to predict expected maximum contraction (EMC). This approach offers a reliable alternative to subjective maximum voluntary contractions (MVCs), especially for injured individuals.
Area of Science:
- Biomechanics
- Neuroscience
- Human Physiology
Background:
- Muscle force assessment commonly uses electromyography (EMG) normalization.
- Maximum voluntary contraction (MVC) is the standard reference but is subjective and painful for injured individuals.
Purpose of the Study:
- Develop a novel EMG normalization technique.
- Predict an EMG reference point using sub-maximal exertions.
- Overcome limitations of the subjective MVC method.
Main Methods:
- Developed regression equations for trunk moments based on anthropometry (120 subjects).
- Recorded EMG during sub-maximal and maximal exertions (20 subjects).
- Assessed the relationship between EMG activity and trunk moment.
Main Results:
- Found a highly linear relationship between EMG activity and trunk moment for most trunk muscles.
- Demonstrated that an EMG-moment reference point can be derived from sub-maximal exertions and predicted maximal exertion (EMC).
Conclusions:
- The proposed normalization technique provides a viable alternative to MVC.
- This method is suitable for individuals with low back injuries or those unable to perform MVC.
- The technique has potential applications for other joints and muscles.