Murphy, Chris and Campbell, Niall and Caulfield, Brian and Ward, Tomas and Deegan, Catherine
Micro electro mechanical systems based sensor for mechanomyography.
In: 19th international conference BIOSIGNAL 2008, Brno, Czech Republic.
The purpose of this work was to design a micro electrical mechanical sensor (MEMS) based
system to measure the mechanomyogram of electrically stimulated muscle. The measuring
device for the mechanomyography (MMG) system consisted of a dual axis accelerometer and
a signal conditioning circuit designed specifically to enhance raw MMG signals . Currently
electromyography (EMG) is the standard tool for measuring muscle contraction. During
electrical stimulation however, EMG measurements are corrupted with a large stimulus
artefact. This obscures any contributions from the much smaller electrical activity of the
muscle tissue itself for the first 10ms to 12ms, before disappearing. MMG, being based on
kinetic measurements, offers an alternative in such cases. We illustrate this with a dual
modality EMG/MMG simultaneous acquisition for a Hoffman-reflex study.
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