What does Electromyography (EMG) measure?

Electromyography (EMG) specifically measures neural impulses or electrical activity in muscles. When a muscle contracts, it generates electrical signals that can be detected by electrodes placed on the skin over the muscle or inserted into the muscle itself. This information is crucial for understanding muscle function and can help in assessing neuromuscular disorders, evaluating the effectiveness of treatments, and even aiding in the rehabilitation process.

The other options are related to different aspects of physiology or speech science. For example, measuring air pressure in the lungs pertains to respiratory function but does not involve EMG. The movement of the tongue could be assessed through other methods, such as video or kinematic analysis, rather than directly measuring muscle activity. Lastly, measuring the volume of air inhaled and exhaled pertains to lung function tests, which require spirometry or similar technologies, not EMG. Thus, EMG's distinct focus on muscle electrical activity sets it apart from these other measures.