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EMG-force relationships in skeletal muscle
Critical Reviews in Biomedical Engineering
|January 1, 1981
Summary
This review explores the quantitative relationship between electromyography (EMG) signals and skeletal muscle force. It highlights signal processing effects and mathematical models, noting disagreements in findings.
Area of Science:
- Biomedical Engineering
- Neuroscience
- Biomechanics
Background:
- The relationship between electromyographic (EMG) signals and muscle force is crucial for understanding muscle function.
- Previous research has explored this relationship, often reporting a linear correlation between isometric force and processed EMG signals.
Purpose of the Study:
- To review the historical attempts at quantitatively defining the force-EMG relationship.
- To analyze the impact of signal processing techniques on experimental outcomes.
- To discuss mathematical models and current agreements/disagreements in the field.
Main Methods:
- Literature review of studies investigating the force-EMG relationship.
- Analysis of experimental factors such as electrode type, placement, amplification, and signal isolation.
- Discussion of joint position and muscular effort effects.
- Presentation and analysis of various mathematical models.
Main Results:
- Numerous studies suggest a linear relationship between isometric force and rectified, integrated EMG.
- Signal processing methods significantly influence the observed force-EMG relationship.
- Disagreements exist among studies regarding the precise nature and consistency of this relationship.
Conclusions:
- The force-EMG relationship is complex and influenced by numerous factors, including signal processing and experimental conditions.
- While a linear relationship is often reported for isometric contractions, its generalizability is debated.
- Further research is needed to refine models and understand the force-EMG relationship, especially during dynamic movements.