The effects of weight load and joint immobilization on reorganization of postural tremor

Ing Shiou Hwang, C. C. Huang, J. H. Su, C. T. Huang, C. H. Wang, M. S. Young

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6 引文 斯高帕斯(Scopus)


To investigate change in coordinative strategies due to wrist immobilization and index loading, postural tremors from the index, hand, and forearm were recorderd during different postural holding tasks. The wrist joint was immobilized with a thermoplastic splint in the constrained condition, and a copper mass of 100 grams was applied to the index finger in the loaded condition. The structures of the postural tremors of all upper limb segments among the unloaded-unconstrained, unloaded-constrained, loaded-unconstrained, and loaded-constrained conditions were compared. Index loading exaggerated index/forearm postural tremor, while the load-induced tremor enhancement was no longer evident for wrist immobilization. In the unloaded condition, wrist immobilization resulted specifically in enhancement of carpal postural tremor, rather than in the index and forearm. Index loading induced a marked tremor peak and relative power in the range of 5-8 Hz. Wrist immobilization potentiated the carpal tremor peak of 1-4 Hz in association with enhancement of carpal-forearm mechanical coupling. In light of structural changes in postural tremor, our data suggest that (1) a wrist splint is effective to counteract load-induced enhancement of postural tremor, and (2) freezing of the wrist joint might facilitate compensatory strategies to minimize passive fluctuation transmission from the carpal to index.

頁(從 - 到)67-77
期刊Electromyography and Clinical Neurophysiology
出版狀態Published - 2006 3月

All Science Journal Classification (ASJC) codes

  • 生理學
  • 神經病學(臨床)
  • 生理學(醫學)


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