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 information 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
TMSi systems vary from just a few channels to high density systems. Our sytems give access to data with quality you have never seen before.Show all products
SAGA 32+/64+ is a 32 or 64 channel amplifier for electrophysiological measurements such as EEG or HD EMG. The SAGA consists of two separable parts, a Data Recorder and Docking Station.Read more
The Refa is stationary system for measuring EEG or HD EMG. The Refa includes unipolar electrophysiological inputs (ExG) but also includes four bipolar electrophysiological inputs (BIP) and four auxiliary inputs (AUX). The Refa is available in 40, 72 and 136 channel configurations. Cascading two devices resulting in a maximum channel count of 272 channels.Read more