Objective models of EMG signals for cyclic processes such as a human gait

Luiza Babska; Monika Selegrat; Jacek J. Dusza

doi:10.1117/12.2248906

28 September 2016 Objective models of EMG signals for cyclic processes such as a human gait

Luiza Babska, Monika Selegrat, Jacek J. Dusza

Proceedings Volume 10031, Photonics Applications in Astronomy, Communications, Industry, and High-Energy Physics Experiments 2016; 100312Q (2016) https://doi.org/10.1117/12.2248906
Event: Photonics Applications in Astronomy, Communications, Industry, and High-Energy Physics Experiments 2016, 2016, Wilga, Poland

Abstract

EMG signals are small potentials appearing at the surface of human skin during muscle work. They arise due to changes in the physiological state of cell membranes in the muscle fibers. They are characterized by a relatively low frequency range (500 Hz) and a low amplitude signal (of the order of μV), making it difficult to record. Raw EMG signal is inherently random shape. However we can distinguish certain features related to the activation of the muscles of a deterministic or quasi-deterministic associated with the movement and its parametric description. Objective models of EMG signals were created on the base of actual data obtained from the VICON system installed at the University of Physical Education in Warsaw. The object of research (healthy woman) moved repeatedly after a fixed track. On her body 35 reflective markers to record the gait kinematics and 8 electrodes to record EMG signals were placed. We obtained research data included more than 1,000 EMG signals synchronized with the phases of gait. Test result of the work is an algorithm for obtaining the average EMG signal received from the multiple registration gait cycles carried out in the same reproducible conditions. The method described in the article is essentially a pre-finding measurement data from the two quasi-synchronous signals at different sampling frequencies for further processing. This signal is characterized by a significant reduction of high frequency noise and emphasis on the specific characteristics of individual records found in muscle activity.

Citation Download Citation

Luiza Babska, Monika Selegrat, and Jacek J. Dusza "Objective models of EMG signals for cyclic processes such as a human gait", Proc. SPIE 10031, Photonics Applications in Astronomy, Communications, Industry, and High-Energy Physics Experiments 2016, 100312Q (28 September 2016); https://doi.org/10.1117/12.2248906

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KEYWORDS

Electromyography

Gait analysis

Signal processing

Electrodes

Reflectivity

Action potentials

Skin

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