Kinetic measures of restabilisation during volitional stepping reveal age-related alterations in the control of mediolateral dynamic stability.
Saved in:
| Title: | Kinetic measures of restabilisation during volitional stepping reveal age-related alterations in the control of mediolateral dynamic stability. |
|---|---|
| Authors: | Singer, Jonathan C.1, McIlroy, William E.1, Prentice, Stephen D.1 sprentice@uwaterloo.ca |
| Source: | Journal of Biomechanics. 2014, Vol. 47 Issue 14, p3539-3545. 7p. |
| Subjects: | Age factors in disease, Reaction forces, Human locomotion, Biomechanics, Human kinematics |
| Abstract: | Research examining age-related changes in dynamic stability during stepping has recognised the Accepted 24 August 2014 importance of the restabilisation phase, subsequent to foot-contact. While regulation of the net ground reaction force (GRFnet) line of action is believed to influence dynamic stability during steady-state locomotion, such control during restabilisation remains unknown. This work explored the origins of agerelated decline in mediolateral dynamic stability by examining the line of action of GRFnet relative to the centre of mass (COM) during restabilisation following voluntary stepping. Healthy younger and older adults ( n = 20 per group) performed three single-step tasks (varying speed and step placement), altering the challenge to stability control. Age-related differences in magnitude and intertrial variability of the angle of divergence of GRFnet line of action relative to the COM were quantified, along with the peak mediolateral and vertical GRFnet components. The angle of divergence was further examined at discrete points during restabilisation, to uncover events of potential importance to stability control. Older adults exhibited a reduced angle of divergence throughout restabilisation. Temporal and spatial constraints on stepping increased the magnitude and intertrial variability of the angle of divergence, although not differentially among the older adults. Analysis of the time-varying angle of divergence revealed agerelated reductions in magnitude, with increases in timing and intertrial timing variability during the later phase of restabilisation. This work further supports the idea that age-related challenges in lateral stability control emerge during restabilisation. Age-related alterations during the later phase of restabilisation may signify challenges with reactive control. [ABSTRACT FROM AUTHOR] |
| 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 | Links: – Type: pdflink Text: Availability: 0 |
|---|---|
| Header | DbId: egs DbLabel: Engineering Source An: 99273191 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
| IllustrationInfo | |
| Items | – Name: Title Label: Title Group: Ti Data: Kinetic measures of restabilisation during volitional stepping reveal age-related alterations in the control of mediolateral dynamic stability. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Singer%2C+Jonathan+C%2E%22">Singer, Jonathan C.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22McIlroy%2C+William+E%2E%22">McIlroy, William E.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Prentice%2C+Stephen+D%2E%22">Prentice, Stephen D.</searchLink><relatesTo>1</relatesTo><i> sprentice@uwaterloo.ca</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Biomechanics%22">Journal of Biomechanics</searchLink>. 2014, Vol. 47 Issue 14, p3539-3545. 7p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Age+factors+in+disease%22">Age factors in disease</searchLink><br /><searchLink fieldCode="DE" term="%22Reaction+forces%22">Reaction forces</searchLink><br /><searchLink fieldCode="DE" term="%22Human+locomotion%22">Human locomotion</searchLink><br /><searchLink fieldCode="DE" term="%22Biomechanics%22">Biomechanics</searchLink><br /><searchLink fieldCode="DE" term="%22Human+kinematics%22">Human kinematics</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Research examining age-related changes in dynamic stability during stepping has recognised the Accepted 24 August 2014 importance of the restabilisation phase, subsequent to foot-contact. While regulation of the net ground reaction force (GRFnet) line of action is believed to influence dynamic stability during steady-state locomotion, such control during restabilisation remains unknown. This work explored the origins of agerelated decline in mediolateral dynamic stability by examining the line of action of GRFnet relative to the centre of mass (COM) during restabilisation following voluntary stepping. Healthy younger and older adults ( n = 20 per group) performed three single-step tasks (varying speed and step placement), altering the challenge to stability control. Age-related differences in magnitude and intertrial variability of the angle of divergence of GRFnet line of action relative to the COM were quantified, along with the peak mediolateral and vertical GRFnet components. The angle of divergence was further examined at discrete points during restabilisation, to uncover events of potential importance to stability control. Older adults exhibited a reduced angle of divergence throughout restabilisation. Temporal and spatial constraints on stepping increased the magnitude and intertrial variability of the angle of divergence, although not differentially among the older adults. Analysis of the time-varying angle of divergence revealed agerelated reductions in magnitude, with increases in timing and intertrial timing variability during the later phase of restabilisation. This work further supports the idea that age-related challenges in lateral stability control emerge during restabilisation. Age-related alterations during the later phase of restabilisation may signify challenges with reactive control. [ABSTRACT FROM AUTHOR] – 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.) |
| PLink | https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=99273191 |
| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.jbiomech.2014.08.022 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 7 StartPage: 3539 Subjects: – SubjectFull: Age factors in disease Type: general – SubjectFull: Reaction forces Type: general – SubjectFull: Human locomotion Type: general – SubjectFull: Biomechanics Type: general – SubjectFull: Human kinematics Type: general Titles: – TitleFull: Kinetic measures of restabilisation during volitional stepping reveal age-related alterations in the control of mediolateral dynamic stability. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Singer, Jonathan C. – PersonEntity: Name: NameFull: McIlroy, William E. – PersonEntity: Name: NameFull: Prentice, Stephen D. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 10 Text: 2014 Type: published Y: 2014 Identifiers: – Type: issn-print Value: 00219290 Numbering: – Type: volume Value: 47 – Type: issue Value: 14 Titles: – TitleFull: Journal of Biomechanics Type: main |
| ResultId | 1 |
