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Changes in cortical inhibition during task-specific contractions in primary writing tremor patients

Identifieur interne : 004C84 ( Main/Merge ); précédent : 004C83; suivant : 004C85

Changes in cortical inhibition during task-specific contractions in primary writing tremor patients

Auteurs : Milos Ljubisavljevic [Serbie, Émirats arabes unis] ; Aleksandra Kacar [Serbie] ; Sladjan Milanovic [Serbie] ; Marina Svetel [Serbie] ; Vladimir S. Kostic [Serbie]

Source :

Movement disorders [ 0885-3185 ] ; 2006.

RBID : Pascal:06-0352383

Descripteurs français

Pascal (Inist)
- Système nerveux pathologie, Tremblement, Contraction, Homme, Stimulation magnétique transcrânienne, Période muette.
Wicri :
- topic : Homme.

English descriptors

KwdEn :
- Contraction, Human, Nervous system diseases, Silent period, Transcranial magnetic stimulation, Tremor.

Abstract

Primary writing tremor (PWT) is a rare disease of unknown pathophysiology. We studied changes in silent period (SP) duration, after transcranial magnetic stimulation (TMS), set at 20% above the motor threshold in 6 PWT patients and 7 healthy control subjects. SP duration was tested during a task-specific act, i.e., writing that induced tremor in all patients in the affected hand (Wr); nonspecific voluntary contraction of intensity, matching that developed during writing (VCWr); and during near maximal voluntary contraction (VCNmax). There were no differences in SP duration during Wr and VCWr contraction on the right affected side or between sides in both PWT patients and control subjects, nor between the groups. However, during VCNmax, SP significantly shortened on both sides in PWT patients, whereas there were no changes in control subjects. Although it appears that inhibitory mechanism are not directly involved in the generation of the tremulous activity, the shortening of SP indicates that central inhibitory mechanisms are affected in PWT patients. Therefore, whereas the underlying pathophysiological mechanisms in PWT and writer's cramp may share common features, the results indicate that PWT is not a variant of focal task-specific dystonia but rather a separate nosological entity.

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Pascal:06-0352383

Le document en format XML

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<front><div type="abstract" xml:lang="en">Primary writing tremor (PWT) is a rare disease of unknown pathophysiology. We studied changes in silent period (SP) duration, after transcranial magnetic stimulation (TMS), set at 20% above the motor threshold in 6 PWT patients and 7 healthy control subjects. SP duration was tested during a task-specific act, i.e., writing that induced tremor in all patients in the affected hand (Wr); nonspecific voluntary contraction of intensity, matching that developed during writing (VCWr); and during near maximal voluntary contraction (VCNmax). There were no differences in SP duration during Wr and VCWr contraction on the right affected side or between sides in both PWT patients and control subjects, nor between the groups. However, during VCNmax, SP significantly shortened on both sides in PWT patients, whereas there were no changes in control subjects. Although it appears that inhibitory mechanism are not directly involved in the generation of the tremulous activity, the shortening of SP indicates that central inhibitory mechanisms are affected in PWT patients. Therefore, whereas the underlying pathophysiological mechanisms in PWT and writer's cramp may share common features, the results indicate that PWT is not a variant of focal task-specific dystonia but rather a separate nosological entity.</div>
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	Movement Disorders (revue)
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Movement Disorders (revue)

Changes in cortical inhibition during task-specific contractions in primary writing tremor patients

Changes in cortical inhibition during task-specific contractions in primary writing tremor patients

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Links to Exploration step

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri