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Electromyography Fundamentals

Electromyography FundamentalsGregory S. Rash, EdDElectromyography (EMG) is the study of muscle function through analysis of the electrical signals emanatedduring muscular contractions. Electromyography is often abused and misused by many clinicians and researchers. Manytimes even experienced electromyographers fail to provide enough information and detail on the protocols, recordingequipment and procedures used to allow other researchers to consistently replicate their studies. Hopefully, this chapter willclarify some of these problems and give the reader a basis for being able to conduct Electromyography studies as part oftheir on-going is measuring the electrical signal associated with the activation of the muscle. This may bevoluntary or involuntary muscle contraction. The EMG activity of voluntary muscle contractions is related to tension. Thefunctional unit of the muscle contraction is a motor unit, which is comprised of a single alpha motor neuron and all thefibers it enervates.

They also evaluate the spontaneous discharges of relaxed muscles and are able to isolate single motor unit activity. Kinesiological EMG is the type most found in the literature regarding movement analysis. This type of EMG studies the relationship of muscular function to movement of the body segments and evaluates timing of muscle activity

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