Table 1

 Classification of tremor

Type of tremorDefinition
Rest tremor Tremor that occurs in a body part that is not voluntarily activated and is completed supported against gravity.
Action tremor Any tremor that is produced by voluntary contraction of muscle, including postural, isometric, and kinetic tremor. The last includes intention tremor.
Postural tremorTremor that is present while voluntarily maintaining a position against gravity.
Kinetic tremorTremor that occurs during any voluntary movement. It may include visually or non-visually guided movements. Tremor during target directed movement is called intention tremor.
Isometric tremorTremor that occurs as a result of muscle contraction against a rigid stationary object.
Task specific tremorKinetic tremor that may appear or become exacerbated during specific activities.