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The influence of Inter-Electrode Distance on the RMS of the SEMG signal
A Melaku1, D K Kumar, A Bradley
1School of Electrical and Computer System Engineering, RMIT University, Melbourne, VIC 3000, Australia.
Abstract:
The aim of this research was to study the dependency of RMS of SEMG on inter-electrode distance. A group of ten healthy subjects (five males and five females) performed isometric elbow flexions of the right arm at 20, 50 and 80% of their maximal voluntary contraction (MVC). The SEMG signal was recorded using surface electrodes placed at a distance of 18 and 36 mm over the biceps brachii muscle. RMS-SEMG signals were analysed for average amplitude. At 20% MVC, no significant change was observed on the RMS value due to the spacing of the electrodes. The effect, however, was significant at 50 and 80% of MVC. Moreover, the study shows that SEMG amplitude is closely related to the level of force.
