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Proceeding Paper

Representation of Joint Patterns in HD SEMG: A Case Study †

by 1,2,*,‡,§, 2,§, 3,§ and 2,4,§
1
Department of Cybernetics, Faculty of Electrical Engineering, Czech Technical University in Prague, 166 27 Prague, Czech Republic
2
The Czech Institute of Informatics, Robotics and Cybernetics, Czech Technical University in Prague, 160 00 Prague, Czech Republic
3
Faculty of Health Studies, Jan Evangelista Purkyně University in Ústí nad Labem, 400 96 Ústí nad Labem, Czech Republic
4
Faculty of Biomedical Engineering, Czech Technical University in Prague, 272 01 Kladno, Czech Republic
*
Author to whom correspondence should be addressed.
Presented at the 13th International Conference on Ubiquitous Computing and Ambient Intelligence UCAmI 2019, Toledo, Spain, 2–5 December 2019.
Current address: CIIRC, Jugoslávských partyzánů 1580/3, 160 00 Prague, Czech Republic.
§
These authors contributed equally to this work.
Proceedings 2019, 31(1), 45; https://doi.org/10.3390/proceedings2019031045
Published: 20 November 2019

Abstract

Investigation of joint patterns is one of many ways to detect soft tissue pathology. Functional blockage of the joint is a common clinical term that expresses one of the most common functional disorders in the musculoskeletal system. In this paper, we focus on HD SEMG signal processing with artificially induced joint blockage using reflective heel pad. Four bipolar electrodes were placed on the muscle vastus medialis and six on the muscle rectus femoris. One proband (male, 46 years) sat on the chair with the knee joint fixed at 70 flexion and hip at 120 between the pelvis and the femur, which corresponds to a relaxed sitting position. HD SEMG signals were recorded during three isometric maximum voluntary contractions of the knee extensors. The first data set of three contractions was measured without heel pad and the second and third data set with using pronation and supination heel pad respectively. Results show that stabilization of the knee is eliminated by fixing the leg in the chair and the muscle vastus medialis has only extension function without using heel pad. Thus, the contraction begins with activation of the muscle rectus femoris, which only has an extension function and then the muscle vastus medialis is added to the contraction. If we use the heel pad, the muscle vastus medialis stabilizes the knee and the contraction begins simultaneously with the musle rectus femoris.
Keywords: HD SEMG; joint patterns; functional blockage; reflective heel pad; muscle timing HD SEMG; joint patterns; functional blockage; reflective heel pad; muscle timing

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MDPI and ACS Style

Milerská, I.; Saifutdinová, E.; Jelínek, M.; Lhotská, L. Representation of Joint Patterns in HD SEMG: A Case Study. Proceedings 2019, 31, 45. https://doi.org/10.3390/proceedings2019031045

AMA Style

Milerská I, Saifutdinová E, Jelínek M, Lhotská L. Representation of Joint Patterns in HD SEMG: A Case Study. Proceedings. 2019; 31(1):45. https://doi.org/10.3390/proceedings2019031045

Chicago/Turabian Style

Milerská, Iva, Elizaveta Saifutdinová, Marek Jelínek, and Lenka Lhotská. 2019. "Representation of Joint Patterns in HD SEMG: A Case Study" Proceedings 31, no. 1: 45. https://doi.org/10.3390/proceedings2019031045

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