Muscle relaxation is impaired in dystonia: A reaction time study
Identifieur interne : 003C49 ( Main/Exploration ); précédent : 003C48; suivant : 003C50Muscle relaxation is impaired in dystonia: A reaction time study
Auteurs : Alessandro Buccolieri [Italie] ; Laura Avanzino [Italie] ; Lucio Marinelli [Italie] ; Carlo Trompetto [Italie] ; Roberta Marchese [Italie] ; Giovanni Abbruzzese [Italie]Source :
- Movement Disorders [ 0885-3185 ] ; 2004-06.
Descripteurs français
- Pascal (Inist)
English descriptors
- KwdEn :
- Adult, Aged, Dystonia, Dystonia (physiopathology), Electromyography (instrumentation), Female, Humans, Male, Middle Aged, Muscle Relaxation (physiology), Muscle, Skeletal (physiopathology), Nervous system diseases, Reaction Time (physiology), Reaction time, Severity of Illness Index, dystonia, inhibitory mechanisms, muscle relaxation, reaction time, sensorimotor integration.
- MESH :
- instrumentation : Electromyography.
- physiology : Muscle Relaxation, Reaction Time.
- physiopathology : Dystonia, Muscle, Skeletal.
- Adult, Aged, Female, Humans, Male, Middle Aged, Severity of Illness Index.
Abstract
A simple visual reaction time (RT) paradigm was used to investigate whether the velocity of relaxation is impaired in dystonia. In 16 subjects with a clinical diagnosis of adult‐onset focal, segmental or multifocal dystonia and in 15 age‐matched normal controls, the relaxation reaction time (R‐RT) and the contraction reaction time (C‐RT) were compared across different tasks involving the flexor carpi radialis (FCR), biceps brachii (BB) and triceps brachii (TR) arm muscles. In normal controls, the latency of EMG termination (R‐RT) was significantly shorter than the latency of electromyographic (EMG) onset (C‐RT) in the BB and TR muscles, but not in the FCR muscle. In dystonic patients, the latency of EMG termination (R‐RT) was significantly longer than the latency of EMG onset (C‐RT) in the FCR and BB muscles. No significant difference of the C‐RT was observed between patients and controls whereas the R‐RT was prolonged significantly in the BB and TR muscles of patients with dystonia and almost significantly in the FCR muscle. This study indicates that muscle relaxation is abnormal in patients with focal (multifocal or segmental) dystonia. The impaired muscle relaxation may contribute to the longer overlap of agonist–antagonist activities (co‐contraction) typically observed in dystonia and to the slowness of voluntary movement sequencing. © 2004 Movement Disorder Society
Url:
DOI: 10.1002/mds.10711
Affiliations:
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Le document en format XML
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Movement Disorder Unit, University of Genoa, Genoa</wicri:regionArea><wicri:noRegion>Genoa</wicri:noRegion></affiliation></author><author><name sortKey="Abbruzzese, Giovanni" sort="Abbruzzese, Giovanni" uniqKey="Abbruzzese G" first="Giovanni" last="Abbruzzese">Giovanni Abbruzzese</name><affiliation wicri:level="1"><country xml:lang="fr">Italie</country><wicri:regionArea>Department of Neurosciences, Ophthalmology and Genetics, Section of Neurology, Movement Disorder Unit, University of Genoa, Genoa</wicri:regionArea><wicri:noRegion>Genoa</wicri:noRegion></affiliation></author></analytic><monogr></monogr><series><title level="j">Movement Disorders</title><title level="j" type="sub">Official Journal of the Movement Disorder Society</title><title level="j" type="abbrev">Mov. Disord.</title><idno type="ISSN">0885-3185</idno><idno type="eISSN">1531-8257</idno><imprint><publisher>Wiley Subscription Services, Inc., A Wiley Company</publisher><pubPlace>Hoboken</pubPlace><date type="published" when="2004-06">2004-06</date><biblScope unit="vol">19</biblScope><biblScope unit="issue">6</biblScope><biblScope unit="page" from="681">681</biblScope><biblScope unit="page" to="687">687</biblScope></imprint><idno type="ISSN">0885-3185</idno></series><idno type="istex">B2630A77E7B74E3BD5C59298F14E089CC8BC6A9C</idno><idno type="DOI">10.1002/mds.10711</idno><idno type="ArticleID">MDS10711</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0885-3185</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Adult</term><term>Aged</term><term>Dystonia</term><term>Dystonia (physiopathology)</term><term>Electromyography (instrumentation)</term><term>Female</term><term>Humans</term><term>Male</term><term>Middle Aged</term><term>Muscle Relaxation (physiology)</term><term>Muscle, Skeletal (physiopathology)</term><term>Nervous system diseases</term><term>Reaction Time (physiology)</term><term>Reaction time</term><term>Severity of Illness Index</term><term>dystonia</term><term>inhibitory mechanisms</term><term>muscle relaxation</term><term>reaction time</term><term>sensorimotor integration</term></keywords><keywords scheme="MESH" qualifier="instrumentation" xml:lang="en"><term>Electromyography</term></keywords><keywords scheme="MESH" qualifier="physiology" xml:lang="en"><term>Muscle Relaxation</term><term>Reaction Time</term></keywords><keywords scheme="MESH" qualifier="physiopathology" xml:lang="en"><term>Dystonia</term><term>Muscle, Skeletal</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Adult</term><term>Aged</term><term>Female</term><term>Humans</term><term>Male</term><term>Middle Aged</term><term>Severity of Illness Index</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Dystonie</term><term>Système nerveux pathologie</term><term>Temps réaction</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">A simple visual reaction time (RT) paradigm was used to investigate whether the velocity of relaxation is impaired in dystonia. In 16 subjects with a clinical diagnosis of adult‐onset focal, segmental or multifocal dystonia and in 15 age‐matched normal controls, the relaxation reaction time (R‐RT) and the contraction reaction time (C‐RT) were compared across different tasks involving the flexor carpi radialis (FCR), biceps brachii (BB) and triceps brachii (TR) arm muscles. In normal controls, the latency of EMG termination (R‐RT) was significantly shorter than the latency of electromyographic (EMG) onset (C‐RT) in the BB and TR muscles, but not in the FCR muscle. In dystonic patients, the latency of EMG termination (R‐RT) was significantly longer than the latency of EMG onset (C‐RT) in the FCR and BB muscles. No significant difference of the C‐RT was observed between patients and controls whereas the R‐RT was prolonged significantly in the BB and TR muscles of patients with dystonia and almost significantly in the FCR muscle. This study indicates that muscle relaxation is abnormal in patients with focal (multifocal or segmental) dystonia. The impaired muscle relaxation may contribute to the longer overlap of agonist–antagonist activities (co‐contraction) typically observed in dystonia and to the slowness of voluntary movement sequencing. © 2004 Movement Disorder Society</div></front></TEI><affiliations><list><country><li>Italie</li></country></list><tree><country name="Italie"><noRegion><name sortKey="Buccolieri, Alessandro" sort="Buccolieri, Alessandro" uniqKey="Buccolieri A" first="Alessandro" last="Buccolieri">Alessandro Buccolieri</name></noRegion><name sortKey="Abbruzzese, Giovanni" sort="Abbruzzese, Giovanni" uniqKey="Abbruzzese G" first="Giovanni" last="Abbruzzese">Giovanni Abbruzzese</name><name sortKey="Avanzino, Laura" sort="Avanzino, Laura" uniqKey="Avanzino L" first="Laura" last="Avanzino">Laura Avanzino</name><name sortKey="Marchese, Roberta" sort="Marchese, Roberta" uniqKey="Marchese R" first="Roberta" last="Marchese">Roberta Marchese</name><name sortKey="Marinelli, Lucio" sort="Marinelli, Lucio" uniqKey="Marinelli L" first="Lucio" last="Marinelli">Lucio Marinelli</name><name sortKey="Trompetto, Carlo" sort="Trompetto, Carlo" uniqKey="Trompetto C" first="Carlo" last="Trompetto">Carlo Trompetto</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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