HK 3600 Study Guide - Final Guide: Alpha Motor Neuron, List Of The Underland Chronicles Characters, Force Platform
24 Dec 2016
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Electromyography sum of the electrical activity of the muscle; emg muap muscle mf motor. Large diameter motor units create a larger emg signal. Surface muscles produce a larger emg signal than deeper muscles where the signal may dissipate. Recall the force is measured with a force transducer, not directly via emg. Distance from skin surface to muscle fiber. We are able to control the last five factors through proper electrode placement and data processing (see methods). Skin is wiped with alcohol to avoid signal impedance at electrode skin interface. Far enough apart - so they are not touching: close enough - to preserve the high frequency of noise, placing them adjacent to each other, but not so they are overlapping. Electrodes must also be acceptable to size to prevent covering too large of an area resulting in cross talk. Three electrode system of differential amplification is used, includes:
