Electromyography (EMG) is a diagnostic technique used in medicine to assess the health of muscles and the nerve cells controlling them. It involves the measurement of electrical activity in muscles during contraction and at rest. EMG is commonly used to:

1. Diagnose Neuromuscular Disorders: EMG helps identify conditions that affect the muscles or nerves controlling them, such as muscular dystrophy, neuropathies, or myopathies.
2. Evaluate Nerve Function: It can assess the health of nerve cells by recording the electrical signals they generate. This is particularly useful in diagnosing conditions like carpal tunnel syndrome or peripheral neuropathies.
3. Monitor Muscle Activity: EMG is used to monitor muscle function during various activities, providing valuable information about muscle performance and coordination.

Here's a brief overview of how EMG is typically performed:

• Needle EMG: A thin, needle-like electrode is inserted into the muscle to record electrical activity. This is usually done to assess the electrical activity at rest and during voluntary contraction.
• Surface EMG: Electrodes are placed on the skin over the muscles being tested. This method is less invasive than needle EMG and is often used for assessing overall muscle activity and coordination.

EMG results are interpreted by a neurologist or another healthcare professional. Abnormal patterns of electrical activity can indicate problems with the nerves or muscles. EMG is often used in conjunction with nerve conduction studies (NCS) to provide a comprehensive evaluation of the neuromuscular system.

It's important to note that EMG is a medical procedure and should be performed by qualified healthcare professionals. If you or someone you know may need an EMG, it's crucial to consult with a healthcare provider to discuss symptoms, concerns, and the appropriateness of the test.