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Myotonia (''Myo'' from Greek; muscle, and ''Tonus'' from Latin; tension) is a symptom of a small handful of certain neuromuscular disorders characterized by delayed relaxation (prolonged contraction) of the skeletal muscles after voluntary contraction or electrical stimulation. Myotonia is present in Myotonia congenita, Paramyotonia Congenita and myotonic dystrophy. Generally, repeated contraction of the muscle can alleviate the myotonia and relax the muscles thus improving the condition, however this is not the case in Paramyotonia congenita. This phenomenon is known as "Warm-Up" and is not to be confused with warming up before exercise, though they may appear similar. Individuals with the disorder may have trouble releasing their grip on objects or may have difficulty rising from a sitting position and a stiff, awkward gait. Myotonia can affect all muscle groups; however, the pattern of affected muscles can vary depending on the specific disorder involved. People suffering from disorders involving myotonia can have a life-threatening reaction to certain anaesthetics; one of these conditions occurs when the patient is under anaesthetic and is termed "Malignant hyperthermia". ==Causes== Myotonia may present in the following diseases with different causes related to the ion channels in the skeletal muscle fiber membrane (Sarcolemma). 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「Myotonia」の詳細全文を読む スポンサード リンク
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