Tremors are non-intentional rhythmic movements of a body part, which are the result of alternating or irregular synchronous contractions of muscles that have an opposite effect on a joint. For example, muscles that, when contracted, result in flexion of the wrist are stimulated synchronously with muscles that result in extension of the wrist. The result is a rhythmic flexion and extension of the wrist. This phenomenon can happen in any part of the body. It is this rhythmic quality that defines and distinguishes tremors from any other abnormal movements.
Norberto Alvarez, MD
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