Task‐dependent modulation of silent period duration in focal hand dystonia
Identifieur interne : 003711 ( Main/Exploration ); précédent : 003710; suivant : 003712Task‐dependent modulation of silent period duration in focal hand dystonia
Auteurs : Cathy M. Stinear [Nouvelle-Zélande] ; Winston D. Byblow [Nouvelle-Zélande]Source :
- Movement Disorders [ 0885-3185 ] ; 2005-09.
Descripteurs français
- Pascal (Inist)
English descriptors
- KwdEn :
- Adult, Dystonia, Dystonic Disorders (diagnosis), Dystonic Disorders (physiopathology), Electromyography, Female, Hand, Hand (physiopathology), Hand Strength (physiology), Humans, Male, Middle Aged, Modulation, Motor cortex, Nervous system diseases, Perception, Questionnaires, Reaction Time (physiology), Rest, Severity of Illness Index, Silent period, Time Factors, Transcranial magnetic stimulation, focal hand dystonia, inhibition, motor cortex, sensory perception, transcranial magnetic stimulation.
- MESH :
- diagnosis : Dystonic Disorders.
- physiology : Hand Strength, Reaction Time.
- physiopathology : Dystonic Disorders, Hand.
- Adult, Electromyography, Female, Humans, Male, Middle Aged, Questionnaires, Rest, Severity of Illness Index, Time Factors.
Abstract
Focal hand dystonia (FHD) is a movement disorder that is also associated with impaired sensory function and sensorimotor integration. The aim of this study was to assess the modulation of inhibitory function in the motor cortex during the performance of four motor tasks (isometric pinch grip, writing, texture discrimination, and a phasic control task) in 8 FHD and 8 control subjects. The affected hands of the FHD subjects and the dominant hands of the control subjects were tested. Inhibitory function was assessed using transcranial magnetic stimulation to evoke a silent period in the ongoing electromyographic activity of the target muscle (first dorsal interosseous). There was no difference between FHD subjects and control subjects in silent period duration, which was significantly longer during the phasic texture discrimination and phasic control task than during the isometric pinch or writing. This finding suggests that the phasic nature of the task may increase cortical inhibitory function, rather than the sensory discrimination task itself. The accuracy of texture discrimination was significantly lower in FHD subjects than in control subjects. Sensory discrimination tasks do not appear to directly modulate the inhibitory processes responsible for the duration of the silent period. © 2005 Movement Disorder Society
Url:
DOI: 10.1002/mds.20514
Affiliations:
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The aim of this study was to assess the modulation of inhibitory function in the motor cortex during the performance of four motor tasks (isometric pinch grip, writing, texture discrimination, and a phasic control task) in 8 FHD and 8 control subjects. The affected hands of the FHD subjects and the dominant hands of the control subjects were tested. Inhibitory function was assessed using transcranial magnetic stimulation to evoke a silent period in the ongoing electromyographic activity of the target muscle (first dorsal interosseous). There was no difference between FHD subjects and control subjects in silent period duration, which was significantly longer during the phasic texture discrimination and phasic control task than during the isometric pinch or writing. This finding suggests that the phasic nature of the task may increase cortical inhibitory function, rather than the sensory discrimination task itself. The accuracy of texture discrimination was significantly lower in FHD subjects than in control subjects. Sensory discrimination tasks do not appear to directly modulate the inhibitory processes responsible for the duration of the silent period. © 2005 Movement Disorder Society</div></front></TEI><affiliations><list><country><li>Nouvelle-Zélande</li></country></list><tree><country name="Nouvelle-Zélande"><noRegion><name sortKey="Stinear, Cathy M" sort="Stinear, Cathy M" uniqKey="Stinear C" first="Cathy M." last="Stinear">Cathy M. Stinear</name></noRegion><name sortKey="Byblow, Winston D" sort="Byblow, Winston D" uniqKey="Byblow W" first="Winston D." last="Byblow">Winston D. Byblow</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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