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ELECTROMYOGRAM ANALYSIS OF - westminster 2025

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The document provides an overview of electromyogram (EMG) analysis focused on the muscle function of the forearm, specifically examining the extensor muscles. It explains the role of electrical activity in muscle contraction and outlines a laboratory experiment to measure this activity using EMG. The document includes safety precautions, materials needed, detailed procedures for data collection, and guiding questions to facilitate understanding. It also discusses common conditions like tennis elbow and how EMG can aid in diagnosis and treatment.

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What is the normal frequency of EMG?

The EMG frequency ranges vary from 0.01 Hz to 10 kHz, depending on the type of examination (invasive or noninvasive). The most useful and important frequency ranges are within the range from 50 to 150 Hz [6,7,8,9,10].

What is the electromyogram EMG used as a measure of?

Electromyography (EMG) measures muscle response or electrical activity in response to a nerves stimulation of the muscle. The test is used to help detect neuromuscular abnormalities. During the test, one or more small needles (also called electrodes) are inserted through the skin into the muscle.

What is an EMG test used to diagnose?

How painful is an EMG test? You may feel some pain or discomfort when your provider inserts the needle into your skin and muscles. But most people can complete the test without issues. After the test, the muscles they tested may feel tender for a few days.

What are the three phases of EMG?

Although the needle EMG study is often discussed as three sequential phasesthe insertional phase (assesses insertional activity), the resting phase (assesses spontaneous activity), and the activation phase (assesses voluntary activity)in practice, the three phases are not sequentially performed.

How painful is an EMG procedure?

An EMG can be used to diagnose a wide variety of neuromuscular diseases, motor problems, nerve injuries, or degenerative conditions, such as: Amyotrophic lateral sclerosis (ALS) Carpal tunnel syndrome. Cervical spondylosis. Guillain-Barre syndrome. Lambert-Eaton syndrome. Muscular dystrophy. Myasthenia gravis.

What is EMG electromyography analysis?

An EMG test looks at the electrical signals your muscles make when they are at rest and when used. A healthy muscle should not give off any electrical signals when you arent moving it. If your muscle is damaged, it may show electrical activity while at rest or activity that is not normal while using it.