Poster Open Access

Should you restrict the hand of able-bodied participants? (Abstract title: Influence of a transradial amputation on neuromuscular control of forearm muscles)

Kristoffersen, Morten Bak; Franzke, Andreas; Murgia, Alessio; Bongers, Raoul; van der Sluis, Corry


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        <foaf:name>van der Sluis, Corry</foaf:name>
        <foaf:givenName>Corry</foaf:givenName>
        <foaf:familyName>van der Sluis</foaf:familyName>
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            <foaf:name>University of Groningen, University Medical Center Groningen, Department of Rehabilitation Medicine, Groningen, the Netherlands</foaf:name>
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    <dct:title>Should you restrict the hand of able-bodied participants? (Abstract title: Influence of a transradial amputation on neuromuscular control of forearm muscles)</dct:title>
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    <dct:issued rdf:datatype="http://www.w3.org/2001/XMLSchema#gYear">2017</dct:issued>
    <dcat:keyword>Prosthesis</dcat:keyword>
    <dcat:keyword>Myocontrol</dcat:keyword>
    <dcat:keyword>EMG</dcat:keyword>
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        <foaf:name>European Commission</foaf:name>
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    <dct:description>&lt;p&gt;ABSTRACT&lt;br&gt; Following an upper-limb amputation the muscles and&lt;br&gt; tendons in the amputation stump are often rearranged by a&lt;br&gt; surgical procedure. One of the purposes of this rearrangement&lt;br&gt; is to shape the stump as to optimally support the prosthesis&lt;br&gt; socket, and to create good control sites for a myoelectric&lt;br&gt; prosthesis using direct control. For the transradial level the&lt;br&gt; main wrist flexors and extensors are used for the latter&lt;br&gt; purpose and the remaining muscles are mainly used for&lt;br&gt; reshaping the stump. This is an interesting phenomenon from&lt;br&gt; a motor control perspective and questions arise to how the&lt;br&gt; control strategy of the neuromotor system changes after&lt;br&gt; amputation when muscles and other tissues are rearranged&lt;br&gt; and subsequently degenerate. Moreover, the feedback loop is&lt;br&gt; heavily altered due to absence of a moving limb. This also&lt;br&gt; appears to have an effect on the electromyogram (EMG) as&lt;br&gt; demonstrated in several studies in which motion intent was&lt;br&gt; classified using features of the EMG measured at the forearm.&lt;br&gt; When comparing classification accuracy between ablebodied&lt;br&gt; subjects and amputee subjects the accuracy was lower&lt;br&gt; for the amputees. However, the relative accuracy between&lt;br&gt; able-bodied participants and amputees is fairly consistent&lt;br&gt; among a range of classification algorithms. Therefore, many&lt;br&gt; studies recruit able-bodied subjects and extrapolate their&lt;br&gt; results to the amputee population.&lt;br&gt; In this study we aim to investigate how transradial&lt;br&gt; amputation influences the EMG in an effort to improve the&lt;br&gt; transferability of results from able-bodied participants to&lt;br&gt; amputee users. In our study protocol, we simultaneously&lt;br&gt; measure the EMG at the forearm of both the unaffected and&lt;br&gt; the affected side of transradial amputees. Participants will&lt;br&gt; perform bimanual (phantom) movements in two different&lt;br&gt; conditions. In the &amp;lsquo;restricted-hand condition&amp;rsquo;, the hand of the&lt;br&gt; able side is restricted by a brace so the movement&lt;br&gt; contractions become isometric. In the &amp;lsquo;free-hand condition&amp;rsquo;,&lt;br&gt; the hand of the able side is not restricted. The purpose of&lt;br&gt; restricting the able hand is to simulate the loss of hand&lt;br&gt; movements while contracting wrist muscles and determine&lt;br&gt; how this influences the EMG. We hypothesize that the EMG&lt;/p&gt; &lt;p&gt;measured at the able-side in the &amp;lsquo;restricted-hand condition&amp;rsquo; is&lt;br&gt; more similar to the EMG at the affected side than it is in the&lt;br&gt; &amp;lsquo;free-hand condition&amp;rsquo;. To quantify this, we use a patternrecognition&lt;br&gt; algorithm to classify the motion intent from both&lt;br&gt; sides and analyse the resulting classification clusters using&lt;br&gt; the separability index, repeatability index and the semiprincipal&lt;br&gt; axes as described in the literature.&lt;/p&gt; &lt;p&gt;&amp;nbsp;&lt;/p&gt;</dct:description>
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