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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{
  "DOI": "10.5281/zenodo.1217847", 
  "abstract": "<p>ABSTRACT<br>\nFollowing an upper-limb amputation the muscles and<br>\ntendons in the amputation stump are often rearranged by a<br>\nsurgical procedure. One of the purposes of this rearrangement<br>\nis to shape the stump as to optimally support the prosthesis<br>\nsocket, and to create good control sites for a myoelectric<br>\nprosthesis using direct control. For the transradial level the<br>\nmain wrist flexors and extensors are used for the latter<br>\npurpose and the remaining muscles are mainly used for<br>\nreshaping the stump. This is an interesting phenomenon from<br>\na motor control perspective and questions arise to how the<br>\ncontrol strategy of the neuromotor system changes after<br>\namputation when muscles and other tissues are rearranged<br>\nand subsequently degenerate. Moreover, the feedback loop is<br>\nheavily altered due to absence of a moving limb. This also<br>\nappears to have an effect on the electromyogram (EMG) as<br>\ndemonstrated in several studies in which motion intent was<br>\nclassified using features of the EMG measured at the forearm.<br>\nWhen comparing classification accuracy between ablebodied<br>\nsubjects and amputee subjects the accuracy was lower<br>\nfor the amputees. However, the relative accuracy between<br>\nable-bodied participants and amputees is fairly consistent<br>\namong a range of classification algorithms. Therefore, many<br>\nstudies recruit able-bodied subjects and extrapolate their<br>\nresults to the amputee population.<br>\nIn this study we aim to investigate how transradial<br>\namputation influences the EMG in an effort to improve the<br>\ntransferability of results from able-bodied participants to<br>\namputee users. In our study protocol, we simultaneously<br>\nmeasure the EMG at the forearm of both the unaffected and<br>\nthe affected side of transradial amputees. Participants will<br>\nperform bimanual (phantom) movements in two different<br>\nconditions. In the &lsquo;restricted-hand condition&rsquo;, the hand of the<br>\nable side is restricted by a brace so the movement<br>\ncontractions become isometric. In the &lsquo;free-hand condition&rsquo;,<br>\nthe hand of the able side is not restricted. The purpose of<br>\nrestricting the able hand is to simulate the loss of hand<br>\nmovements while contracting wrist muscles and determine<br>\nhow this influences the EMG. We hypothesize that the EMG</p>\n\n<p>measured at the able-side in the &lsquo;restricted-hand condition&rsquo; is<br>\nmore similar to the EMG at the affected side than it is in the<br>\n&lsquo;free-hand condition&rsquo;. To quantify this, we use a patternrecognition<br>\nalgorithm to classify the motion intent from both<br>\nsides and analyse the resulting classification clusters using<br>\nthe separability index, repeatability index and the semiprincipal<br>\naxes as described in the literature.</p>\n\n<p>&nbsp;</p>", 
  "author": [
    {
      "family": "Kristoffersen, Morten Bak"
    }, 
    {
      "family": "Franzke, Andreas"
    }, 
    {
      "family": "Murgia, Alessio"
    }, 
    {
      "family": "Bongers, Raoul"
    }, 
    {
      "family": "van der Sluis, Corry"
    }
  ], 
  "id": "1217847", 
  "issued": {
    "date-parts": [
      [
        2017, 
        8, 
        15
      ]
    ]
  }, 
  "publisher": "Zenodo", 
  "title": "Should you restrict the hand of able-bodied participants? (Abstract title: Influence of a transradial amputation on neuromuscular control of forearm muscles)", 
  "type": "graphic"
}
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