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Tremor consists of rhythmic oscillations across a joint resulting from involuntary, alternating activation of agonist and antagonist muscles. For example, wrist tremor is caused by alternating activation and relaxation of forearm flexor and extensor muscles. Essential tremor (ET) is the most prevalent movement disorder among adults, affecting up to 2% of the general population. The prevalence of ET increases with age; estimates range up to more than 10% in individuals older than age 70 years. Also called benign essential tremor and familial tremor, ET may not be benign and can result in severe impairment in activities of daily living in some individuals. ET manifests as postural and kinetic tremor at the arms and hands; the head and voice are often involved (Benito-Leon and Louis 2007; Jankovic 2000).

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