Week3_Electromyography_joshdean_section_30_group_4_week3 (2)

Week3_Electromyography_joshdean_section_30_group_4_week3...

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ECE 3280 Principles and Practice of Biomedical Engineering Laboratory Electromyography Experiment Section 30, Group 4 Felipe Zambrano (33 .3 %) Joshua Dean (33 .3 %) and Keith Oldano (33 .3 %) Experiment Conducted September 16, 2011 Submitted September 23, 2011 Abstract Eccentric muscle contractions involve the muscle to elongate while under tension due to an opposing force being greater than the force generated by the muscle while concentric muscle contractions have muscles shortening while generating force. An electromyography (EMG) is one of the most commonly used forms of biofeedback, a process of self-regulation by which an individual is provided with sensory feedback about a biological function in order to gain control over that biological function. While biofeedback can be used in muscle rehabilitation and muscle tension control, group 4 tested to see what the average maximum muscle contraction would be for eccentric and concentric contractions and determine if there were significant differences between the concentric contraction results for using and not using biofeedback. In order to obtain the necessary results, we proceeded with an EMG of the biceps and quadriceps, collected the results for each tested variable over three trials, and performed a T-Test for data analysis of the biofeedback. The analysis indicated the maximum concentric contractions without biofeedback for the quadriceps to have a mean of 0.4014±0.1325 mV for the raw EMG and 0.001342±0.0051 mV for the integrated EMG. The biceps, under the same variables, had respective averages of 2.9492±0.1242 mV for raw EMG and 0.01046±0.0064 mV for integrated EMG. However, there was not enough evidence to indicate biofeedback provided greater maximum concentric contractions for both the biceps and quadriceps when using a 0.05 as alpha in the paired t-test. Our results provide a starting point for other experiments to follow and perhaps they can test
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other muscles apart from flexors and extensors, or to test biofeedback for isotonic/isometric contractions. Introduction The experiment conducted focuses on the concentric and eccentric muscle contractions involving the biceps and quadriceps (thigh). Eccentric contractions are when the generated force by the muscles is less than the opposing force, which causes the muscles to elongate under tension, and concentric contractions are muscles shortening while generating force. Additionally, the two selected muscles are anatomically different to each other in that the biceps contract when the arm bends and extends when the arm extends; however, the quadriceps contracts when the leg extends and extends when the leg bends. These two muscles are ideal to be tested since they provide antagonistic movement of flexing the arm and extending the leg, but these dynamic differences will be crucial in the experiment’s test of seeing whether or not there is any effect from biofeedback because the test will not be centered on one specific kind of muscle movement
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This note was uploaded on 11/14/2011 for the course ECE 3820 taught by Professor Wang during the Fall '11 term at GWU.

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Week3_Electromyography_joshdean_section_30_group_4_week3...

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