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EMG History and Principles
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abnormal activity abnormal EMG action potentials amplifier amplitude axilla bioelectric bizarre potentials brachioradialis Buchthal Calibration clinical EMG concentric needle electrode deltoid diagnostic differential disease distal dorsal interosseous muscle duration elbow elec electrical electrographic electromyographer EMG examination EMG study evoked potential excite extensor digitorum fasciculation fatigue fibrillation film frequency response gastrocnemius giant potentials H-potential indicate insertion activity interference pattern latency maximum effort median nerve motor neuron motor unit action motor unit potentials movement artifact msec muscle fibers muscular myasthenia myasthenic myopathies myotonia myotonia congenita needle movement nerve conduction velocity neurogenic neuropathy normal EMG normal muscle Norris numbers obtained pain patient percussion peripheral nerve positive denervation potentials potentials evoked progressive muscular dystrophy pulse quadriceps recording circuit reduced interference reflexes S-D curve single fiber skin electrodes supramaximal synapse synchronization technique terminal conduction tibial tracing ulnar nerve ulnar nerve stimulation unit action potentials voltage voluntary contraction weakness wrist