Electromyography
5. Detecting the EMG signal
Thera are two main possibilites of detecting EMG signal: surface EMG, which involves placing the electrodes on the skin overlying the muscle; intramuscular EMG, which involves inserting an electrode into the muscle itself.
We will discuss only the surface EMG (sEMG). If you are more interested in intramuscular EMG Im gonna reffer you on The Comprehensive Textbook of Clinical Biomechanics by J. Richards (2018) or Muscles Alive, Their Functions Revealed by Electromyograph by Basmajian)