The MMG is a low frequency vibration that may be observed when a muscle is contracted using suitable measuring techniques.
The MMG may provide a useful alternative to the electromyogram (EMG) for monitoring muscle activity.
It is currently the subject of research activity into prosthetic control and assistive technologies for the disabled.
[2] Muscle sounds were first described in print by the Jesuit scientist Francesco Maria Grimaldi[3] in a posthumous publication of 1665, which influenced the work of the English physician William Hyde Wollaston[4] and the German physicist Paul Erman.
The past two centuries of repeated rediscovery and neglect of the phenomenon were summarised by Stokes and Blythe[6] in 2001.