Elbow flexion and extension movements characterization by means of EMG
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2008-01-05
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BITTAR, L. M.
Castro, M.C.F.
Castro, M.C.F.
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BIODEVICES 2008 - Proceedings of the 1st International Conference on Biomedical Electronics and Devices
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BITTAR, L. M.; CASTRO, M. C. F. Elbow flexion and extension movements characterization by means of EMG. BIODEVICES 2008 - Proceedings of the 1st International Conference on Biomedical Electronics and Devices, v. 1, p. 147-150, jan. 2008.
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Electromyographic (EMG) signal is the electrical manifestation of neuromuscular activation associated with muscle contraction. The present work intends to characterize the behavior of the muscles biceps and triceps during elbow flexion and extension movements, without load. These movements were performed at horizontal and vertical planes. Three types of test were performed, for each plane, relating EMG signal with joint position. Five men volunteers, ages ranged between 18 and 21 years old, were selected to participate to the tests. The first test consisted to move 10 degrees for each three seconds until the allowed maximum flexion and then, to return at the same way to the initial position. For the second test, the same movement was made but continuously, without stopping at intermediate positions. And for the third test, continuously flexion and extension movements were repeated sequentially but for different amplitudes, increasing by 10 degrees each. The tests were repeated, three times each. Initially, graphical analysis of the data was made for standard behavior detection and, for a quantitative analysis, after EMG preprocessing, averages and variation coefficients were calculated from specific intervals at the beginning, middle and at the end of movement. Although an EMG signals inherent variability, results showed inter and intra subject's repeatability, but only for movements performed at the horizontal plane.