Effects of environmental instabilities on endpoint stiffness during the maintenance of human arm posture.
Identifieur interne : 001177 ( PubMed/Corpus ); précédent : 001176; suivant : 001178Effects of environmental instabilities on endpoint stiffness during the maintenance of human arm posture.
Auteurs : Matthew A. Krutky ; Randy D. Trumbower ; Eric J. PerreaultSource :
- Conference proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference [ 1557-170X ] ; 2009.
English descriptors
- KwdEn :
- MESH :
- physiology : Elastic Modulus, Postural Balance, Posture.
- Adult, Female, Humans, Male.
Abstract
Using the upper limb to manipulate objects or tools requires maintenance of stable arm posture. The ability to maintain stable postures is dependent on the mechanical properties of the arm, which can be characterized by estimates of endpoint stiffness. In this study we quantified the endpoint stiffness of the human arm during postural interactions with mechanically imposed unstable loads. The purpose was to determine the extent to which arm stiffness is adapted according to the mechanical properties of the environment during postural tasks. We estimated the endpoint stiffness of the right arms of eight subjects as they interacted with four haptic environments: rigid, unstable along the direction of maximal endpoint stiffness and orthogonal to this direction, and a high-strength unstable environment also aligned to the orientation of maximal endpoint stiffness. The size and orientation of endpoint stiffness were quantified for each haptic condition. Stiffness size was increased along the directions of the destabilizing environments (p<0.003). However, the environments had no significant effect on stiffness orientation (p>0.26). These findings suggest that at a fixed posture interactions with unstable environments can induce moderate, task-appropriate changes in limb mechanics that are tuned to the environment. However, these changes are small relative to those that can be obtained by changing limb posture.
DOI: 10.1109/IEMBS.2009.5334751
PubMed: 19965062
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pubmed:19965062Le document en format XML
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Perreault</name></author></titleStmt><publicationStmt><idno type="wicri:source">PubMed</idno><date when="2009">2009</date><idno type="doi">10.1109/IEMBS.2009.5334751</idno><idno type="RBID">pubmed:19965062</idno><idno type="pmid">19965062</idno><idno type="wicri:Area/PubMed/Corpus">001177</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en">Effects of environmental instabilities on endpoint stiffness during the maintenance of human arm posture.</title><author><name sortKey="Krutky, Matthew A" sort="Krutky, Matthew A" uniqKey="Krutky M" first="Matthew A" last="Krutky">Matthew A. Krutky</name><affiliation><nlm:affiliation>Sensory Motor Performance Program, The Rehabilitation Institute of Chicago and Department of Biomedical Engineering, Northwestern University, Evanston, IL 60611, USA.</nlm:affiliation></affiliation></author><author><name sortKey="Trumbower, Randy D" sort="Trumbower, Randy D" uniqKey="Trumbower R" first="Randy D" last="Trumbower">Randy D. Trumbower</name></author><author><name sortKey="Perreault, Eric J" sort="Perreault, Eric J" uniqKey="Perreault E" first="Eric J" last="Perreault">Eric J. Perreault</name></author></analytic><series><title level="j">Conference proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. 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The ability to maintain stable postures is dependent on the mechanical properties of the arm, which can be characterized by estimates of endpoint stiffness. In this study we quantified the endpoint stiffness of the human arm during postural interactions with mechanically imposed unstable loads. The purpose was to determine the extent to which arm stiffness is adapted according to the mechanical properties of the environment during postural tasks. We estimated the endpoint stiffness of the right arms of eight subjects as they interacted with four haptic environments: rigid, unstable along the direction of maximal endpoint stiffness and orthogonal to this direction, and a high-strength unstable environment also aligned to the orientation of maximal endpoint stiffness. The size and orientation of endpoint stiffness were quantified for each haptic condition. Stiffness size was increased along the directions of the destabilizing environments (p<0.003). However, the environments had no significant effect on stiffness orientation (p>0.26). These findings suggest that at a fixed posture interactions with unstable environments can induce moderate, task-appropriate changes in limb mechanics that are tuned to the environment. However, these changes are small relative to those that can be obtained by changing limb posture.</div></front></TEI><pubmed><MedlineCitation Owner="NLM" Status="MEDLINE"><PMID Version="1">19965062</PMID><DateCreated><Year>2009</Year><Month>12</Month><Day>07</Day></DateCreated><DateCompleted><Year>2010</Year><Month>04</Month><Day>02</Day></DateCompleted><DateRevised><Year>2014</Year><Month>12</Month><Day>04</Day></DateRevised><Article PubModel="Print"><Journal><ISSN IssnType="Print">1557-170X</ISSN><JournalIssue CitedMedium="Print"><Volume>2009</Volume><PubDate><Year>2009</Year></PubDate></JournalIssue><Title>Conference proceedings : ... 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The purpose was to determine the extent to which arm stiffness is adapted according to the mechanical properties of the environment during postural tasks. We estimated the endpoint stiffness of the right arms of eight subjects as they interacted with four haptic environments: rigid, unstable along the direction of maximal endpoint stiffness and orthogonal to this direction, and a high-strength unstable environment also aligned to the orientation of maximal endpoint stiffness. The size and orientation of endpoint stiffness were quantified for each haptic condition. Stiffness size was increased along the directions of the destabilizing environments (p<0.003). However, the environments had no significant effect on stiffness orientation (p>0.26). These findings suggest that at a fixed posture interactions with unstable environments can induce moderate, task-appropriate changes in limb mechanics that are tuned to the environment. However, these changes are small relative to those that can be obtained by changing limb posture.</AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Krutky</LastName><ForeName>Matthew A</ForeName><Initials>MA</Initials><AffiliationInfo><Affiliation>Sensory Motor Performance Program, The Rehabilitation Institute of Chicago and Department of Biomedical Engineering, Northwestern University, Evanston, IL 60611, USA.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Trumbower</LastName><ForeName>Randy D</ForeName><Initials>RD</Initials></Author><Author ValidYN="Y"><LastName>Perreault</LastName><ForeName>Eric J</ForeName><Initials>EJ</Initials></Author></AuthorList><Language>eng</Language><GrantList CompleteYN="Y"><Grant><GrantID>K25 HD044720</GrantID><Acronym>HD</Acronym><Agency>NICHD NIH HHS</Agency><Country>United States</Country></Grant><Grant><GrantID>NS053813</GrantID><Acronym>NS</Acronym><Agency>NINDS NIH HHS</Agency><Country>United 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Version="1">11404214</PMID></CommentsCorrections><CommentsCorrections RefType="Cites"><RefSource>Exp Brain Res. 2001 Dec;141(3):312-23</RefSource><PMID Version="1">11715075</PMID></CommentsCorrections><CommentsCorrections RefType="Cites"><RefSource>J Neurophysiol. 2002 Jun;87(6):2808-16</RefSource><PMID Version="1">12037183</PMID></CommentsCorrections><CommentsCorrections RefType="Cites"><RefSource>Exp Brain Res. 2004 Aug;157(4):507-17</RefSource><PMID Version="1">15112115</PMID></CommentsCorrections><CommentsCorrections RefType="Cites"><RefSource>Biol Cybern. 1999 May;80(5):327-37</RefSource><PMID Version="1">10365425</PMID></CommentsCorrections><CommentsCorrections RefType="Cites"><RefSource>J Neurophysiol. 2007 Apr;97(4):2676-85</RefSource><PMID Version="1">17287438</PMID></CommentsCorrections><CommentsCorrections RefType="Cites"><RefSource>J Neurosci. 2007 Jul 18;27(29):7705-16</RefSource><PMID Version="1">17634365</PMID></CommentsCorrections><CommentsCorrections RefType="Cites"><RefSource>PLoS One. 2009;4(5):e5411</RefSource><PMID Version="1">19412540</PMID></CommentsCorrections><CommentsCorrections RefType="Cites"><RefSource>J Neurophysiol. 2008 May;99(5):2101-13</RefSource><PMID Version="1">18287550</PMID></CommentsCorrections></CommentsCorrectionsList><MeshHeadingList><MeshHeading><DescriptorName MajorTopicYN="N" UI="D000328">Adult</DescriptorName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="N" UI="D055119">Elastic Modulus</DescriptorName><QualifierName MajorTopicYN="N" UI="Q000502">physiology</QualifierName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="N" UI="D005260">Female</DescriptorName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="N" UI="D006801">Humans</DescriptorName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="N" UI="D008297">Male</DescriptorName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="N" UI="D004856">Postural Balance</DescriptorName><QualifierName MajorTopicYN="Y" 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