Reduction of neuromuscular redundancy for postural force generation using an intrinsic stability criterion
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| Title: | Reduction of neuromuscular redundancy for postural force generation using an intrinsic stability criterion |
|---|---|
| Authors: | Bunderson, Nathan E.1, Burkholder, Thomas J.2, Ting, Lena H.1,2 lena.ting@bme.gatech.edu |
| Source: | Journal of Biomechanics. Jun2008, Vol. 41 Issue 7, p1537-1544. 8p. |
| Subjects: | Extremities (Anatomy), Anatomy, Arm, Fins (Anatomy) |
| Abstract: | Abstract: Postural control requires the coordination of multiple muscles to achieve both endpoint force production and postural stability. Multiple muscle activation patterns can produce the required force for standing, but the mechanical stability associated with any given pattern may vary, and has implications for the degree of delayed neural feedback necessary for postural stability. We hypothesized that muscular redundancy is reduced when muscle activation patterns are chosen with respect to intrinsic musculoskeletal stability as well as endpoint force production. We used a three-dimensional musculoskeletal model of the cat hindlimb with 31 muscles to determine the possible contributions of intrinsic muscle properties to limb stability during isometric force generation. Using dynamic stability analysis we demonstrate that within the large set of activation patterns that satisfy the force requirement for posture, only a reduced subset produce a mechanically stable limb configuration. Greater stability in the frontal-plane suggests that neural control mechanisms are more highly active for sagittal-plane and for ankle joint control. Even when the limb was unstable, the time-constants of instability were sufficiently great to allow long-latency neural feedback mechanisms to intervene, which may be preferential for movements requiring maneuverability versus stability. Local joint stiffness of muscles was determined by the stabilizing or destabilizing effects of moment-arm versus joint angle relationships. By preferentially activating muscles with high local stiffness, muscle activation patterns with feedforward stabilizing properties could be selected. Such a strategy may increase intrinsic postural stability without co-contraction, and may be useful criteria in the force-sharing problem. [Copyright &y& Elsevier] |
| Copyright of Journal of Biomechanics is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 32088037 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Reduction of neuromuscular redundancy for postural force generation using an intrinsic stability criterion – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Bunderson%2C+Nathan+E%2E%22">Bunderson, Nathan E.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Burkholder%2C+Thomas+J%2E%22">Burkholder, Thomas J.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Ting%2C+Lena+H%2E%22">Ting, Lena H.</searchLink><relatesTo>1,2</relatesTo><i> lena.ting@bme.gatech.edu</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Biomechanics%22">Journal of Biomechanics</searchLink>. Jun2008, Vol. 41 Issue 7, p1537-1544. 8p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Extremities+%28Anatomy%29%22">Extremities (Anatomy)</searchLink><br /><searchLink fieldCode="DE" term="%22Anatomy%22">Anatomy</searchLink><br /><searchLink fieldCode="DE" term="%22Arm%22">Arm</searchLink><br /><searchLink fieldCode="DE" term="%22Fins+%28Anatomy%29%22">Fins (Anatomy)</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Abstract: Postural control requires the coordination of multiple muscles to achieve both endpoint force production and postural stability. Multiple muscle activation patterns can produce the required force for standing, but the mechanical stability associated with any given pattern may vary, and has implications for the degree of delayed neural feedback necessary for postural stability. We hypothesized that muscular redundancy is reduced when muscle activation patterns are chosen with respect to intrinsic musculoskeletal stability as well as endpoint force production. We used a three-dimensional musculoskeletal model of the cat hindlimb with 31 muscles to determine the possible contributions of intrinsic muscle properties to limb stability during isometric force generation. Using dynamic stability analysis we demonstrate that within the large set of activation patterns that satisfy the force requirement for posture, only a reduced subset produce a mechanically stable limb configuration. Greater stability in the frontal-plane suggests that neural control mechanisms are more highly active for sagittal-plane and for ankle joint control. Even when the limb was unstable, the time-constants of instability were sufficiently great to allow long-latency neural feedback mechanisms to intervene, which may be preferential for movements requiring maneuverability versus stability. Local joint stiffness of muscles was determined by the stabilizing or destabilizing effects of moment-arm versus joint angle relationships. By preferentially activating muscles with high local stiffness, muscle activation patterns with feedforward stabilizing properties could be selected. Such a strategy may increase intrinsic postural stability without co-contraction, and may be useful criteria in the force-sharing problem. [Copyright &y& Elsevier] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Biomechanics is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.jbiomech.2008.02.004 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 8 StartPage: 1537 Subjects: – SubjectFull: Extremities (Anatomy) Type: general – SubjectFull: Anatomy Type: general – SubjectFull: Arm Type: general – SubjectFull: Fins (Anatomy) Type: general Titles: – TitleFull: Reduction of neuromuscular redundancy for postural force generation using an intrinsic stability criterion Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Bunderson, Nathan E. – PersonEntity: Name: NameFull: Burkholder, Thomas J. – PersonEntity: Name: NameFull: Ting, Lena H. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 06 Text: Jun2008 Type: published Y: 2008 Identifiers: – Type: issn-print Value: 00219290 Numbering: – Type: volume Value: 41 – Type: issue Value: 7 Titles: – TitleFull: Journal of Biomechanics Type: main |
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