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Electromyography (EMG) (a)  Consider the technique of electromyography (EMG) to examine muscle function about joints during movement. Explain where...

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Medical Sciences

  1. Electromyography (EMG)

(a)  Consider the techniqueof electromyography (EMG) to examine muscle function about jointsduring movement. Explain where the captured, high frequency rawsignal originates, and describe the physiological basis withreference to the relevant parts of the neuromuscularsystem.                                                                                         [8marks]

(b) When processing EMG signals, thefollowing terms are frequently encountered in the literature:

(i) Band Pass filtering

(ii) Full wave rectification

(iii) Normalisation to maximumvoluntary contraction (MVC)

(iv) Median frequency

Please explain what each of these terms mean, and describe theirrelevance/role in the context of interpretingEMG.                

Answer & Explanation Solved by verified expert
3.6 Ratings (338 Votes)
aElectromyography or EMG is a technique that records the movement of muscles It is based on the fact that when our muscle contracts an electric activity is generated and this is recorded from the areas of neighboring skin Electrodes are placed close to the muscle groups to record the activity during EMG When muscle is activated then the electrical activity in this muscles are propogated as action potentials along the sarcolemma and are picked up by the electrodes Physiological basis of EMG The neuromuscular system includes motor neurons in spinal cord sensory neurons in dorsal root ganglion and skeletal muscle fibers that links    See Answer
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