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Effects of Task and Part on Tremor Characteristics in Patients with Essential Tremor
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 Title & Authors
Effects of Task and Part on Tremor Characteristics in Patients with Essential Tremor
Heo, J.H.; Kim, J.W.; Kwon, Y.R.; Eom, Gwang-Moon; Kwon, D.Y.; Lee, C.N.; Park, K.W.; Manto, M.;
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 Abstract
Essential tremor is a neurological disorder with a tremor of the arms and hands. It is well known that essential tremor is characterized by the postural tremor and the action tremor. There has been no report on the quantitative difference in the characteristics of two tremor types. The purpose of this study was to investigate the possible difference in tremor characteristics of postural and action tremors. Seventeen patients with essential tremor (, 7 men, 10 women) participated in this study. Patients performed the tasks of postural maintenance (arms outstretched) and daily actions (spiral drawing). Three-axes (pitch, roll and yaw) gyro sensors were attached on index finger, back of hand and forearm, from which the segment and the joint angular velocities were calculated. Outcome measure was the tremor amplitude defined as the root-mean-square mean of the vector-sum angular velocity at segments and joints. Two-way ANOVA showed that task and joint had main factor on the tremor amplitude (p < 0.05). Post-hoc analysis revealed that tremor amplitude at the metacarpo-phalangeal joint was not affected by task (p > 0.05). However, tremor amplitude at the wrist joint differed among the tasks (p < 0.05), and it was greater in the action tasks than in postural task. Tremor was greater at finger segments than at hand and forearm and it increased in action tasks. The results of this study would be helpful for the understanding and task-specific treatments of the essential tremor.
 Keywords
essential tremor;task specific;angular velocity;action tremor;postural tremor;
 Language
Korean
 Cited by
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