What does electromyography (EMG) measure?

• A. Cardiac rhythm
• B. Muscle contraction and electrical activity
• C. Blood oxygen levels
• D. Fluid levels in the lungs

Answer: (B)

Electromyography (EMG) specifically measures the electrical activity produced by skeletal muscles during muscle contraction. This technique involves placing electrodes on the skin or inserting them into the muscle to detect the electrical signals that occur when the muscle fibers change from a resting state to an active state. These signals provide valuable information about muscle activation, coordination, and neuromuscular function.

Understanding EMG is crucial for sports medicine and rehabilitation professionals, as it helps assess muscle function and can assist in diagnosing neuromuscular disorders, evaluating muscle performance, and designing appropriate training or rehabilitation programs. By analyzing the electrical activity of muscles, practitioners can gain insights into how well the muscles are functioning, which is essential for developing effective athletic training practices.