Describe the electromyograph (EMG).
The EMG provides a more convenient means of
measur-ing neuromuscular function. Like the MMG, a peripheral motor nerve is
stimulated with a supramaximal current.
The electrical response of the muscle, the
compound action potential, is then recorded. Stimulating electrodes are placed
over a peripheral nerve, and recording elec-trodes are placed over an
innervated muscle. A ground electrode is placed as well. Unlike the MMG, the
EMG does not require a preloaded muscle or precise force vector measurements
because the response is electrical rather than mechanical. A greater variety of
muscles may be studied because the EMG is not specifically designed for a
particular muscle, nor is direct, continuous access to the studied muscle
required.
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