fasciculation presumed due to shingles

Thanks for the interest! Actually the muscle doesn’t make this noise. We just ‘display’ it’s electrical activity as sound because it’s sometimes easier to hear abnormalities than to see them on an oscilloscope screen. Electromyography takes the tiny voltages generated naturally by muscle cells as they contract, amplifies this signal, and displays it on an oscilloscope as a graph of voltage against time. Traditionally the analogue voltage signal would be simultaneously ‘displayed’ as sound by simply playing it through a loudspeaker. Nowadays everything is digital so the voltage signal can be stored as a .wav file and played later on a computer, or stored as a .AVI video file.

I ALWAYS KNEW that muscles make sounds/noises when they twitch! KNEW IT! Wondering IF that's electricity passing thru' nerves, or, whatever.