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.

The other is a passive electrode, which detect the EMG signal without a built-in amplifier, making it important to reduce all possible skin resistance as much as possible (requires conducting gels and extensive skin preparation). ... One must make sure all applied filters have zero phase shifts. The measure of the ability of the differential

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