Mesure de l'activité électrique des muscles.
Designation:
System for the recording and analysis of muscle electrical activity (Electromyography - EMG).
Manufacturer: Various leading manufacturers (e.g., Delsys, Noraxon, Thought Technology).
Main Function:
- Precise measurement of the bioelectrical activity generated by skeletal muscles during voluntary contractions or reflex actions.
- In-depth analysis of muscle coordination (activation timing), localized muscle fatigue, and force-EMG relationships.
- Extensively used in biomechanical research, physical rehabilitation, ergonomics, and high-performance sports science.
Technical Characteristics:
Sensors: Non-invasive surface electrodes (sEMG) or invasive fine-wire intramuscular electrodes.
Sampling Frequency: Ranging from 1000 to 5000 Hz, depending on the system's specifications.
Resolution: High fidelity, typically ± 0.1 μV.
Connectivity: Wired telemetry or wireless telemetry (Bluetooth/Wi-Fi/Proprietary RF protocols).
Includes comprehensive software suites designed for robust data acquisition, advanced signal processing (filtering, RMS, rectification), and biomechanical EMG analysis.
Portability: Compact modules designed for flexible use in highly controlled lab environments or dynamic field settings.
Usage:
- Evaluation of muscle activation patterns and neuromuscular performance in sports and strength training.
- Monitoring the onset of localized muscle fatigue and optimizing post-exercise recovery strategies.
- Studies focusing on motor control, gait analysis, and complex biomechanical movements.
- Clinical diagnostics and targeted rehabilitation (neurology, physiotherapy, and biofeedback training).
Advantages:
- Provides highly precise, real-time measurement of neuromuscular activity.
- Easily synchronizes and integrates with other biomechanical tracking systems (e.g., 3D kinematics, force plates).
- Highly versatile, suitable for both laboratory research and field applications due to wireless portable modules.
- Allows for a granular and detailed analysis of motor unit recruitment and muscle firing patterns.
Limitations:
- Requires meticulous skin preparation and exact electrode placement to ensure reliable measurements and avoid cross-talk.
- Professional, research-grade systems entail a significant financial investment.
- Signals are highly susceptible to electrical interference (noise), sweat, and motion artifacts during dynamic movements.