Characterization of Textile Electrodes for Emg Measurements (original) (raw)
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Measurement of EMG activity with textile electrodes embedded into clothing
Physiological Measurement, 2007
Novel textile electrodes that can be embedded into sports clothing to measure averaged rectified EMG have been developed for an easy use in the field tests and in clinical settings. The purpose of this study was to evaluate the validity, reliability and feasibility of this new product to measure averaged rectified EMG. Validity was tested by comparing the signals from bipolar textile electrodes (42 cm 2) and traditional bipolar surface electrodes (1.32 cm 2) during bilateral isometric knee extension exercise with two electrode locations (A: both electrodes located in the same place, B: traditional electrodes placed on the individual muscles according to SENIAM, n=10 persons for each). Within-session repeatability (coefficient of variation CV %, n=10) was calculated from 5 repetitions of 60 % maximum voluntary contraction (MVC). Day-today repeatability (n=8) was assessed by measuring three different isometric force levels in five consecutive days. Feasibility of the textile electrodes in field conditions was assessed during maximal treadmill test (n=28). Bland-Altman plots showed a good agreement within 2SD between the textile and traditional electrodes demonstrating that the textile electrodes provide similar information on the EMG signal amplitude as the traditional electrodes. The within-session CV ranged from 13 to 21 % in both the textile and traditional electrodes. The day-today CV was smaller ranging from 4 to11 % for the textile electrodes. A similar relationship (r 2 =0,5) was found between muscle strength and EMG of traditional and textile electrodes. The feasibility study showed that the textile electrode technique can potentially make EMG measurements very easy in the field conditions. This study indicates that the textile electrodes embedded into shorts is a valid and feasible method for assessing the average rectified value of EMG.
Surface electromyography using textile-based electrodes
2012
Surface Electromyography (sEMG) is a fundamental method for study the biomechanical behavior of a person, allowing the extraction of valuable information for health professionals. This paper presents a research conducted with the purpose of developing textile electrodes for non invasive surface electromyography. Conducting fibers were used in a specifc arrangement taking into consideration SENIAM recommendations and embedded in a textile fabric. A comparison was made between conventional electrodes and the proposed ones. The results showed that the behavior is similar, which can constitute a valid alternative, overcoming some disadvantages such as the comfort for the user.
Performances evaluation of textile electrodes for EMG remote measurements
Conference proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference, 2013
This work focus on the evaluation of textile electrodes for EMG signals acquisition. Signals have been acquired simultaneously from textile electrode and from gold standard electrodes, by using the same acquisition system; tests were done across subjects and with multiple trials to enable a more complete analysis. This research activity was done in the frame of the European Project Interaction, aiming at the development of a system for a continuous daily-life monitoring of the functional performance of stroke survivors in their physical interaction with the environment.
Characterization of the Electrode-Skin Impedance of Textile Electrodes
Characterization of the Electrode-Skin Impedance of Textile Electrodes, 2014
Wearable systems are expected to contribute for improving traditional biopotential signals monitoring devices due to higher freedom and unobtrusiveness provided to the wearer. Textile electrodes present advantages compared with the conventional Ag/AgCl electrodes for the capturing of biopoten-tials, namely in terms of skin irritation due to the hydrogel and the need of a technician to place the electrodes on the correct positions. Due to the lack of hydrogel, textile electrodes present different electrical contact characteristics. The skin-electrode impedance is an important feature since it affects the captured signal quality. Although a low impedance is desired, a comfortable wearable system should not require the electrodes to be covered by the hydrogel or be moistened. A forearm sleeve provided with textile electrodes was used to study the electrode-skin impedance and the signal-to-noise ratio (SNR) of surface electromyographic (EMG) signals on a long-term use basis. The sleeve can be adjusted for different levels of tightening to control the pressure applied on the electrodes. The obtained results provide valuable information on the pressure that the textile garments of a sleeve or vest should apply on the recording electrodes, in order to assure a good electrical and mechanical contact between the electrodes and the skin and decrease the noise due to motion. It was observed that the electrode-skin impedance measurement alone is not sufficient to establish a relation with the SNR. The extraction of parameters from an electrical equivalent model of the electrode-skin interface allows to determine a relation with the model parameters and the SNR. The evaluation of these parameters during long-term monitoring will allow assessing the quality of biopotential measurements in textile electrodes.
Design and Testing of a Textile EMG Sensor for Prosthetic Control
Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 2020
Nowadays, Electromyography (EMG) signals generated by the amputee's residual limbs are widely used for the control of myoelectric prostheses, usually with the aid of pattern-recognition algorithms. Since myoelectric prostheses are wearable medical devices, the sensors that integrate them should be appropriate for the users'daily life, meeting the requirements of lightness, flexibility, greater motion identification, and skin adaptability. Therefore, this study aims to design and test an EMG sensor for prosthetic control, focusing on aspects such as adjustability, lightness, precise and constant signal acquisition; and replacing the conventional components of an EMG sensor with textile materials. The proposed sensor was made with Shieldex Technik-tex P130 + B conductive knitted fabric, with 99% pure silver plating. EMG data acquisition was performed twice on three volunteers: one with the textile sensor, and other with a commercial sensor used in prosthetic applications. Overall, the textile and the commercial sensor presented total average Signal-to-Noise Ratio (SNR) values of 10.24±5.45 dB and 11.74±8.64 dB, respectively. The authors consider that the obtained results are promising and leave room for further improvements in future work, such as designing strategies to deal with known sources of noise contamination and to increase the adhesion to the skin. In sum, the results presented in this paper indicate that, with the appropriate improvements, the proposed textile sensor may have the potential of being used for myoelectric prosthetic control, which can be a more ergonomic and accessible alternative to the sensors that are currently used for controlling these devices.
Textile based electrodes for ECG and EMG measurements
2017
This work is financed by FEDER funds through the Competitivity Factors Operational Programme - COMPETE and by national funds through FCT – Foundation for Science and Technology within the scope of the project POCI-01-0145-FEDER-007136.
Journal of sports science & medicine, 2018
The Athos ® wearable system integrates surface electromyography (sEMG ) electrodes into the construction of compression athletic apparel. The Athos system reduces the complexity and increases the portability of collecting EMG data and provides processed data to the end user. The objective of the study was to determine the reliability and validity of Athos as compared with a research grade sEMG system. Twelve healthy subjects performed 7 trials on separate days (1 baseline trial and 6 repeated trials). In each trial subjects wore the wearable sEMG system and had a research grade sEMG system's electrodes placed just distal on the same muscle, as close as possible to the wearable system's electrodes. The muscles tested were the vastus lateralis (VL), vastus medialis (VM), and biceps femoris (BF). All testing was done on an isokinetic dynamometer. Baseline testing involved performing isometric 1 repetition maximum tests for the knee extensors and flexors and three repetitions of...
Textile Electrodes In Electromyography Measurements For Hand Gesture Recognition
2020
I want to thank Professor Kari Halonen for the opportunity to work with interesting topics in his research group and providing me with an intriguing topic for my master's thesis. I also want to thank my two advisors, post doctoral researcher Elina Ilén for her insight in textiles and assistant professor Ivan Vujaklija for his expertise in electromyography and data classification. A big thank you to my colleague Samu Järvinen as well for collaborating with me in this project. I also had a great deal of help and support from my spouse Lauri who has an abundance of medical literature and knowledge and my sister Elsa who lent me a hand when mine was not working.
2015 9th International Conference on Sensing Technology (ICST), 2015
The paper presents a practical approach concerning the design, implementation and testing of dry textile electrodes for surface electromyography purposes. Several knitted structures were designed and knitted with conductive yarns, in order to compare the influence of the fabric structure in the electrode performance. The effect of the type of conductive yarn was also studied by comparing three different yarns. It was found that the textile electrodes perform well for sEMG acquisition, with a clear depiction of the muscle activity produced. There are significant differences between the structures tested and there is also some influence from the yarn used.