Detection and Conditioning of Surface EMG Signals

Merletti, Roberto; Botter, Alberto; Barone, Umberto

doi:10.1002/9781119082934.ch03

Cited by 36 publications

(17 citation statements)

References 64 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Surface electrodes have usually higher electrode impedances, which is usually accompanied by increased noise levels (Grimnes, 1983). Electrode impedance and background noise also depend on the electrode types (adhesive gel or dry surface electrodes), the electrode contact surface size, and conditions at the skin, such as the presence of perspiration (Grimnes, 1983;Godin et al, 1991;Huigen et al, 2002;Roy et al, 2007;Piervirgili et al, 2014;Merletti et al, 2016). Figure 2G shows the devastating effects of pronounced surface-electrode noise on continuous EMG recordings blinding its visibility, which complies with the absence of significant cross-correlation ( Figure 2H).…”

Section: Effects Of Surface-electrode Noisementioning

confidence: 99%

“…This may be ascribed to a good adaptation of the electrolyte interface between electrode and skin in combination with the larger contact surface of the electrodes. Larger contact surfaces imply lower impedances (Geddes, 1972;Merletti et al, 2016). The contact surface of a disk electrode, Ø 10 mm, is about fivefold that of the contact surface of a needle electrode of length 12 mm, Ø 0.4 mm.…”

Section: Effects Of Surface-electrode Noisementioning

confidence: 99%

“…In human for example, impedances of adhesive surface AG/AgCl electrodes can be 1-2 magnitudes higher than that reported for sc needle electrodes (Grimnes, 1983;Huigen et al, 2002;Journée et al, 2004). High electrode impedances also increase the sensitivity for power line noise (Piervirgili et al, 2014;Merletti et al, 2016). Extra fastening of the electrodes by circumferential applied tape, further called "taping, " might reduce electrode impedance and thus reduce the background noise when compared to absent mechanical fixation (not taped condition).…”

Section: Introductionmentioning

confidence: 98%

See 2 more Smart Citations

Extramuscular Recording of Spontaneous EMG Activity and Transcranial Electrical Elicited Motor Potentials in Horses: Characteristics of Different Subcutaneous and Surface Electrode Types and Practical Guidelines

Journée

Reed

et al. 2020

Front. Neurosci.

View full text Add to dashboard Cite

Introduction: Adhesive surface electrodes are worthwhile to explore in detail as alternative to subcutaneous needle electrodes to assess myogenic evoked potentials (MEP) in human and horses. Extramuscular characteristics of both electrode types and different brands are compared in simultaneous recordings by also considering electrode impedances and background noise under not mechanically secured (not taped) and taped conditions. Methods: In five ataxic and one non-ataxic horses, transcranial electrical MEPs, myographic activity, and noise were simultaneously recorded from subcutaneous needle (three brands) together with pre-gelled surface electrodes (five brands) on four extremities. In three horses, the impedances of four adjacent-placed surfaceelectrode pairs of different brands were measured and compared. The similarity between needle and surface EMGs was assessed by cross-correlation functions, pairwise comparison of motor latency times (MLT), and amplitudes. The influence of electrode noise and impedance on the signal quality was assessed by a failure rate (FR) function. Geometric means and impedance ranges under not taped and taped conditions were derived for each brand. Results: High coherencies between EMGs of needle-surface pairs degraded to 0.7 at moderate and disappeared at strong noise. MLTs showed sub-millisecond simultaneous differences while sequential variations were several milliseconds. Subcutaneous MEP

show abstract

Section: Effects Of Surface-electrode Noisementioning

confidence: 99%

Section: Effects Of Surface-electrode Noisementioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

See 1 more Smart Citation

Extramuscular Recording of Spontaneous EMG Activity and Transcranial Electrical Elicited Motor Potentials in Horses: Characteristics of Different Subcutaneous and Surface Electrode Types and Practical Guidelines

Journée

Reed

et al. 2020

Front. Neurosci.

View full text Add to dashboard Cite

show abstract

“…5 shows the latest version of our sEMG front-end, which has been obtained as result of our strengthened knowl- edge in bio-electronic acquisition field over years. The frontend works with the typical bipolar electrodes configuration [2], i.e., using two sensing electrodes to sense myofibers depolarization (V E1 1 and V E2 ) and one to refer body potential w.r.t. acquisition device (V ER ) [58].…”

Section: Front-end For Semg Processingmentioning

confidence: 99%

“…From its first clinical use in 1966 until now, the surface Elec-troMyoGraphy (sEMG) technique still maintains its essential place in the list of medical procedures to investigate the health of the human body. Indeed, by placing bio-potential electrodes directly on skin surface, sEMG provides an accessible way to monitor the electrical activity of skeletal muscles [1], [2]. During the last 30 years, beyond the constant evolution of sEMG in clinical applications [3]- [5], its practice also branches, reaching different non-medical sectors [6], e.g., fitness monitoring [7], (therapeutic) gaming control [8], virtual reality interaction [9], human-machine interface [10], [11], speech [12] and gesture [13], [14] recognition.…”

Section: Introductionmentioning

confidence: 99%

Tutorial: A Versatile Bio-Inspired System for Processing and Transmission of Muscular Information

et al. 2021

View full text Add to dashboard Cite

Device wearability and operating time are trending topics in recent state-of-art works on surface ElectroMyoGraphic (sEMG) muscle monitoring. No optimal trade-off, able to concurrently address several problems of the acquisition system like robustness, miniaturization, versatility, and power efficiency, has yet been found. In this tutorial we present a solution to most of these issues, embedding in a single device both an sEMG acquisition channel, with our custom event-driven hardware feature extraction technique (named Average Threshold Crossing), and a digital part, which includes a microcontroller unit, for (optionally) sEMG sampling and processing, and a Bluetooth communication, for wireless data transmission. The knowledge acquired by the research group brought to an accurate selection of each single component, resulting in a very efficient prototype, with a comfortable final size (57.8 mm x 25.2 mm x 22.1 mm) and a consistent signal-to-noise ratio of the acquired sEMG (higher than 15 dB). Furthermore, a precise design of the firmware has been performed, handling both signal acquisition and Bluetooth transmission concurrently, thanks to a FreeRTOS custom implementation. In particular, the system adapts to both sEMG and ATC transmission, with an application throughput up to 2 kB s −1 and an average operating time of 80 h (for high resolution sEMG sampling), relaxable to 8 B s −1 throughput and about 230 h operating time (considering a 110 mAh battery), in case of ATC acquisition only. Here we share our experience over the years in designing wearable systems for the sEMG detection, specifying in detail how our event-driven approach could benefit the device development phases. Some previous basic knowledge about biosignal acquisition, electronic circuits and programming would certainly ease the repeatability of this tutorial.

show abstract

EMG-Controlled Human-Robot Interfaces

Tsuji²,

Fukuda

2017

Human Modelling for Bio-Inspired Robotics

View full text Add to dashboard Cite

Detection and Conditioning of Surface EMG Signals

Cited by 36 publications

References 64 publications

Extramuscular Recording of Spontaneous EMG Activity and Transcranial Electrical Elicited Motor Potentials in Horses: Characteristics of Different Subcutaneous and Surface Electrode Types and Practical Guidelines

Extramuscular Recording of Spontaneous EMG Activity and Transcranial Electrical Elicited Motor Potentials in Horses: Characteristics of Different Subcutaneous and Surface Electrode Types and Practical Guidelines

Tutorial: A Versatile Bio-Inspired System for Processing and Transmission of Muscular Information

EMG-Controlled Human-Robot Interfaces

Contact Info

Product

Resources

About