Week 2

Research about the EMG electrodes. The EMG signal is measured either non-invasively with surface electrodes or invasively with wire or needle electrodes. Since typical EMG signal levels are in the region of 400 μV to 3 mV (depending on many factors), the measured EMG signal is almost always pre-amplified, amplified.

EMG can be recorded from the skin surface or by placing an electrode directly within the subject’s muscle. This is usually referred to as a fine-wire recording. Surface EMG is generally recorded with either passive or active electrodes placed on the intact skin surface over the belly of the subjects muscle, while fine-wire recordings use a wire electrode that is inserted into the muscle by a trained (and, in most cases, licensed) professional. Each electrode type has specific advantages and disadvantages.


Examples of EMG electrodes : 

Figure 1 : Connection Method of Disposable EMG Monopolar Needle Electrodes

Figure 2 : Surface EMG Electrodes