Definition
Electromyography (EMG) is a technique for evaluating and recording the electrical activity of skeletal muscles. EMG uses electrodes on the skin to detect muscle activation.
Explanation
- EMGs assess the health and function of muscles and the nerve cells that control them.
- Measurements are taken at rest and during contracted states to determine recruitment patterns and fatigue.
- Results help identify muscle imbalances, activation deficits, and neuromuscular disease.
- In fitness, EMGs determine the most effective exercises for targeting specific muscles.
Examples
- Using EMG to compare muscle activity in the front delt during an overhead press vs. lateral raise.
- Assessing latissimus dorsi activation during pull-ups, lat pulldowns, and rows.
Related Terms
- Muscle activation, motor unit recruitment, neuromuscular fatigue
Common Questions
- Does EMG measure strength? No, it detects electrical signals but not force output.
- Can I get an EMG test? Yes, they are done by doctors, physical therapists, and researchers.
Do Not Confuse With
- EKGs – Assess heart electrical activity, not muscles.
- MRI – Imaging test that shows body structures, does not measure function.
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