KP351 Lecture Notes - Lecture 2: Nyquist Frequency, Reference Electrode, Adipose Tissue
20 Mar 2020
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One electrode + one electrically neutral site. Two electrodes + one electrically neutral site. Not ideal for deeper muscles (beyond 10-20mm in depth) Increases precision due to uninsulated tip size. Very similar to the unmyelinated shealth of the nerve. 2-d arrears of 6-9 electrodes that can determine individual mu"s from the summed. Blood ow, muscle depth, muscle length, adipose tissue: noise sources. Gain factor, emg signal frequency content, nyquist limit theorem. Blood ow, muscle length/depth, motion artifacts, rf interference. (one electrode + one electrically neutral site) (two electrodes + one electrically neutral site) No ideal for deeper muscles (beyond 10-20mm in depth) If surface electrode used when it shouldn"t have been then other muscles may interfere with the signal. Increases precision due to uninsulated top size. Can be uncomfortable - consider the task. 2-d arrays of 6-9 electrodes that an determine mu. Innervation ratio: ratio of the amount of muscle bres that are innervated by motor neuron.
