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Electromyography (EMG) is an electrodiagnostic medicine technique for evaluating and recording the electrical activity produced by skeletal muscles.〔Kamen, Gary. Electromyographic Kinesiology. In Robertson, DGE et al. Research Methods in Biomechanics. Champaign, IL: Human Kinetics Publ., 2004.〕 EMG is performed using an instrument called an electromyograph, to produce a record called an electromyogram. An electromyograph detects the electrical potential generated by muscle cells when these cells are electrically or neurologically activated. The signals can be analyzed to detect medical abnormalities, activation level, or recruitment order, or to analyze the biomechanics of human or animal movement. ==Medical uses== EMG testing has a variety of clinical and biomedical applications. EMG is used as a diagnostics tool for identifying neuromuscular diseases, or as a research tool for studying kinesiology, and disorders of motor control. EMG signals are sometimes used to guide botulinum toxin or phenol injections into muscles. EMG signals are also used as a control signal for prosthetic devices such as prosthetic hands, arms, and lower limbs. EMG then acceleromyograph may be used for neuromuscular monitoring in general anesthesia with neuromuscular-blocking drugs, in order to avoid postoperative residual curarization (PORC).〔Harvey AM, Masland RL: ''Actions of durarizing preparations in the human.'' Journal of Pharmacology And Experimental Therapeutics, Vol. 73, Issue 3, 304-311, 1941〕〔Botelho SY: ''Comparison of simultaneously recorded electrical and mechanical activity in myasthenia gravis patients and in partially curarized normal humans.'' Am J Med. 1955 Nov;19(5):693-6. PMID 13268466〕〔Christie TH, Churchill-Davidson HC: ''The St. Thomas's Hospital nerve stimulator in the diagnosis of prolonged apnoea.'' Lancet. 1958 Apr 12;1(7024):776. PMID 13526270〕〔Engbaek J, Ostergaard D, Viby-Mogensen J: ''Double burst stimulation (DBS): a new pattern of nerve stimulation to identify residual neuromuscular block.'' Br J Anaesth. 1989 Mar;62(3):274-8. PMID 2522790〕 Except in the case of some purely primary myopathic conditions EMG is usually performed with another electrodiagnostic medicine test that measures the conducting function of nerves. This is called a nerve conduction studies (NCS). Needle EMG and NCSs are typically indicated when there is pain in the limbs, weakness from spinal nerve compression, or concern about some other neurologic injury or disorder.〔, which cites * *〕 Spinal nerve injury does not cause neck, mid back pain or low back pain, and for this reason, evidence has not shown EMG or NCS to be helpful in diagnosing causes of axial lumbar pain, thoracic pain, or cervical spine pain.〔 Needle EMG may aid with the diagnosis of nerve compression or injury (such as carpal tunnel syndrome), nerve root injury (such as sciatica), and with other problems of the muscles or nerves. Less common medical conditions include amyotrophic lateral sclerosis, myasthenia gravis, and muscular dystrophy. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「electromyography」の詳細全文を読む スポンサード リンク
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