Characterization of laplacian surface electromyographic signals during isometric contraction in biceps brachii
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hdl:2117/20937
Tipus de documentText en actes de congrés
Data publicació2013
EditorInstitute of Electrical and Electronics Engineers (IEEE)
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Abstract
Surface electromyography (sEMG) is a
noninvasive technique for monitoring the electrical activity
produced by the muscles. Usually, sEMG is performed by
carrying out monopolar or bipolar recordings by means of
conventional Ag/AgCl electrodes. In contrast, Laplacian
recordings of sEMG could also be obtained by using coaxial
ring electrodes. Laplacian recordings increase spatial
resolution and attenuate other distant bioelectric interferences.
Nevertheless, the spectral characteristics of this kind of
recordings have been scarcely studied. The objective of this
paper is to characterize the sEMG signals recorded with a
Laplacian ring electrode and to compare them with traditional
bipolar recordings with disc electrodes. Both kinds of signals
were collected simultaneously in two healthy subjects during
resting and sustained isometric voluntary contraction activities
in biceps brachii. The conducted study computed the
cumulative percentage of the power spectrum of sEMG so as to
determine the energy bandwidth of the two kinds of recordings
and the signal to noise ratio in different bands of the sEMG
spectrum. Also, muscle fatigue, a condition when muscle force
is reduced, was assessed using indexes from amplitude and
frequency domain. The results of this study suggest that
Laplacian sEMG has higher spectral bandwidth but a lower
signal to noise ratio in comparison to bipolar sEMG. In
addition, frequency fatigue indexes showed that Laplacian
recording had better response than bipolar recording, which
suggests that Laplacian electrode can be useful to study
muscular fatigue due to better spatial resolution.
CitacióEstrada, L. [et al.]. Characterization of laplacian surface electromyographic signals during isometric contraction in biceps brachii. A: IEEE Engineering in Medicine and Biology Society. "Conference proceedings : 35th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Conference". Osaka: Institute of Electrical and Electronics Engineers (IEEE), 2013, p. 535-538.
ISBN978-1-4577-0214-3
Versió de l'editorhttp://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6609555
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