An alternative to needle EMG?

High Density EMG

Traditionally, neuromuscular disorders have been diagnosed with needle EMG, often in combination with motor-nerve conduction studies. In the latter, surface electrodes are widely used to record the compound muscle action potentials.

Other than this, single bipolar surface recordings are not being used in routine electro-diagnosis, because of inherent limitations. They are being used, however, in other fields, such as kinesiology, ergonomics, rehabilitation and sports medicine, where it is important to record on-off switching of muscles or to estimate muscle force.

Obviously, needle EMG also has disadvantages, the most prominent being the invasiveness and the lack of spatial information.



With the above in mind, a number of research groups around the world have started to evaluate the possibilities of high density surface EMG (HDsEMG), using dense arrays of individual electrodes, to obtain informat from the muscle. This information is sometimes overlapping, but often complementary to the information extracted by needle EMG

At this point, HDsEMG is still very much in the research phase. It is thought, however, that it may become clinically useful in the assessment of for example motor fiber conduction velocity (MFCV) measurements (see specifications below).

Obvious advantages of HDsEMG are its non-invasiveness (especially attractive in pediatric applications) and its ability to record over very long time periods.



• Motor Fiber Conduction Velocity (MFCV)
• Fatigue Spatial distribution of motor unit action potentials (MUAP)
• Spatial distribution of recruitment patterns
• Localization of motor end plates


Optimal solutions for high quality research

TMSi products give access to data with quality you have never seen before. No mains interference. No movement artefacts. The optimal research device on the market.

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TMSi SAGA 32/64+

SAGA 32+/64+ is a 32 or 64 channel amplifier for electrophysiological measurements such as EEG or HD EMG. The best data quality combined with optimal flexibility.

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