Characterization of laplacian surface electromyographic signals during isometric contraction in biceps brachii

Estrada, Luis; Torres, Abel; Garcia-Casado, Javier; Prats-Boluda, Gema; Jané, R.

doi:10.1109/embc.2013.6609555

Cited by 8 publications

(12 citation statements)

References 16 publications

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“…The use of Laplacian electrodes of bigger diameter, or of bipolar configuration instead of TCB could yield signals of higher amplitude and better SNR. The evolution of fatigue parameters during the SIM was similar to that reported during isometric contraction in the biceps brachii when bipolar and Laplacian electrodes were compared [9], with an increase of ARV and FInsm5 and a decrease of MDF. It was noted that ARV was influenced by cardiac activity in bipolar and Laplacian EMGdi recordings but MDF and FInsm5 were more affected in bipolar EMGdi compared to Laplacian EMGdi.…”

Section: Resultssupporting

confidence: 76%

“…DISCUSSION AND CONCLUSIONS EMGdi signal was recorded simultaneously using a bipolar disc electrode configuration and a Laplacian electrode. Previous works have reported the advantage of using Laplacian electrodes in other anatomical regions of human body [6][7][8][9]. In the present study during both BHM and SIM, power spectrum of Laplacian EMGdi signal was more distributed in frequency, contained in a broader frequency range compared to bipolar EMGdi power spectrum.…”

Section: Resultsmentioning

confidence: 41%

“…Pre-gelled, disposable circular electrodes of 10 mm diameter (foam electrode 50/PK -EL501, Biopac Systems Inc, Santa Barbara, CA, USA) were placed over diaphragm muscle area between the 7 th and 8 th intercostal space, lateral to the right midclavicular line, with 50 mm inter-electrode distance. Dry Laplacian electrode (tripolar concentric ring electrode in quasi-bipolar configuration, TCB) of 24 mm outer diameter was plugged into a signal conditioner circuit and placed in the inter-electrode space of two Ag/AgCl electrodes and attached with an adhesive plaster to skin (Fig 1), as it was presented in [9]. A reference electrode was positioned at left ankle.…”

Section: B Signal Acquisitionmentioning

confidence: 99%

“…It overcomes the reduced spatial resolution and the influence of cardiac activity, drawbacks found in bipolar recordings [6,7]. The use of Laplacian electrodes has proven promising results in the study of electrocardiogram (ECG) [6], electroencephalogram [8], electroenterogram [7], and sEMG in biceps brachii [9].…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Laplacian Diaphragm Electromyographic Recordings in a Static Inspiratory Maneuver

et al. 2014

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Abstract-Diaphragm electromyography (EMGdi) provides important information on diaphragm activity, to detect neuromuscular disorders of the most important muscle in the breathing inspiratory phase. EMGdi is habitually recorded using needles or esophageal catheters, with the implication of being invasive for patients. Surface electrodes offer an alternative for the non-invasive assessment of diaphragm activity. Ag/AgCl surface disc electrodes are used in monopolar or bipolar configuration to record EMGdi signals. On the other hand, Laplacian surface potential can be estimated by signal recording through active concentric ring electrodes. This kind of recording could reduce physiological interferences, increase the spatial selectivity and reduce orientation problems in the electrode location. The aim of this work is to compare EMGdi signals recorded simultaneously with disc electrodes in bipolar configuration and a Laplacian ring electrode over chest wall. EMGdi signal was recorded in one healthy subject during a breath hold maneuver and a static inspiratory maneuver based on Mueller's technique. In order to estimate the covered frequency range and the degree of noise contamination in both bipolar and Laplacian EMGdi signals, the cumulative percentage of the power spectrum and the signal to noise ratio in subbands were determined. Furthermore, diaphragm fatigue was evaluated by means of amplitude and frequency parameters. Our findings suggest that Laplacian EMGdi recording covers a broader frequency range although with higher noise contamination compared to bipolar EMGdi recording. Finally, in Laplacian recording fatigue indexes showed a clearer trend for muscle fatigue detection and also a reduced cardiac interference, providing an alternative to bipolar recording for diaphragm fatigue studies.

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Section: Resultssupporting

confidence: 76%

Section: Resultsmentioning

confidence: 41%

Section: B Signal Acquisitionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evaluation of Laplacian Diaphragm Electromyographic Recordings in a Static Inspiratory Maneuver

et al. 2014

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“…Double differential configuration (DD) and Laplacian electrode configuration are new techniques for improving the accuracy of conventional EMG. These techniques have insufficient sensitivity, even though they can minimize the crosstalk that occurs from surrounding muscles (Extrada et al, 2013, Guerrero et al, 2016, Mesin et al, 2009.…”

Section: Introductionmentioning

confidence: 99%

Development and verification of circular array electromyography system for the selective electromyography signal detection

Chae

Song

Park

et al. 2017

JBSE

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Development and verification of circular array electromyography system for the selective electromyography signal detection Abstract Detecting selective electromyography (EMG) signals is important for minimizing errors in muscle information from crosstalk and delivering movement intension orders clearly. In this paper, we propose a circular-array EMG system for detecting the orientation of muscle fibers and recording maximal EMG amplitude. This system records six-channel bipolar EMG signals using a circular array grid consisting of twelve Au electrodes. We evaluate the performance of this system by hypothesizing that: (1) this system can detect the fiber orientation of forearm muscles (including flexor carpi radialis (FCR), extensor carpi radialis (ECR), pronator, and supinator) and record the maximal EMG amplitude; (2) it minimizes EMG amplitude error caused by twisting between the orientations of electrodes and muscles during complex movement from a body part with multi-degrees of freedom (DOF); the normalized root mean squares (Normalized RMS) were used to analyze the six-channel EMG signals to verify these three hypotheses. It was concluded that the circular array EMG system is superior to other systems in its acquisition of selective EMG signals. It could be a useful technique for improving the DOF in movement and obtaining accurate muscle information.

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Looking for optimal concentric ring electrodes: influence of design aspects on their performance

Garcia-Casado,

Ye-Lin,

Prats-Boluda

et al. 2023

Meas. Sci. Technol.

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Concentric ring electrodes (CREs) allow improved spatial resolution, reduced crosstalk and interference, and increased bandwidth in the sensing of bioelectrical activity. A wide variety of designs have been used, but their selection is rarely well-founded. The aim of this work is to assess the implications of aspects of CRE design such as the distance between poles, their width and their maximum diameter on aspects such as the signal amplitude (and, therefore, quality), Laplacian estimation error and spatial selectivity (SS). For this purpose, a finite dimensional model of the CRE was used, and its response to the activity of an electric dipole of variable depth was simulated via finite element method modeling. Our results show that increasing the electrode size increases the error to a greater extent than the signal amplitude increases. Pole widths should be as small as possible. The middle ring of the tripolar CRE should be as far away as possible from the central disc. Tripolar CREs typically outperform bipolar CREs of the same outer diameter, significantly reducing the Laplacian estimation error and improving the SS at the cost of a small decrease in signal amplitude. Our results also show that the design of current commercial versions of CREs can be optimized. Furthermore, we propose a methodology that facilitates the selection of an adequate CRE configuration based on the specifications for CRE performance and practical aspects, such as the depth of activity sources to be recorded from and/or the maximum size of electrodes to be used. The monitoring and analysis of bioelectrical signals in a wide range of applications can benefit from the enhanced electrode design and methodology proposed in this work.

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Characterization of laplacian surface electromyographic signals during isometric contraction in biceps brachii

Cited by 8 publications

References 16 publications

Evaluation of Laplacian Diaphragm Electromyographic Recordings in a Static Inspiratory Maneuver

Evaluation of Laplacian Diaphragm Electromyographic Recordings in a Static Inspiratory Maneuver

Development and verification of circular array electromyography system for the selective electromyography signal detection

Looking for optimal concentric ring electrodes: influence of design aspects on their performance

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