• Login
    View Item 
    •   UMB Digital Archive
    • UMB Open Access Articles
    • UMB Open Access Articles 2018
    • View Item
    •   UMB Digital Archive
    • UMB Open Access Articles
    • UMB Open Access Articles 2018
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    All of UMB Digital ArchiveCommunitiesPublication DateAuthorsTitlesSubjectsThis CollectionPublication DateAuthorsTitlesSubjects

    My Account

    LoginRegister

    Statistics

    Display statistics

    The center of pressure and ankle muscle cocontraction in response to anterior-posterior perturbations

    • CSV
    • RefMan
    • EndNote
    • BibTex
    • RefWorks
    Author
    Kim, D.
    Hwang, J.-M.
    Date
    2018
    Journal
    PLoS ONE
    Publisher
    Public Library of Science
    Type
    Article
    
    Metadata
    Show full item record
    See at
    https://dx.doi.org/10.1371/journal.pone.0207667
    Abstract
    Though both contraction of agonist muscles and co-contraction of antagonistic muscle pairs across the ankle joint are essential to postural stability, they are perceived to operate independently of each other, In an antagonistic setup, agonist muscles contract generating moment about the joint, while antagonist muscles contract generating stiffness across the joint. While both work together in maintaining robustness in the face of external perturbations, contractions of agonist muscles and co-contractions of antagonistic muscle pairs across the ankle joint play different roles in responding to and adapting to external perturbations. To determine their respective roles, we exposed participants to repeated perturbations in both large and small magnitudes. The center of pressure (COP) and a cocontraction index (CCI) were used to quantify the activation of agonist muscles and antagonistic muscle pairs across the ankle joint. Our results found that participants generated moment of a large magnitude across the ankle joint - a large deviation in the COP curve - in response to perturbations of a large magnitude (p <0.05), whereas the same participants generated higher stiffness about the ankle - a larger value in CCI - in response to perturbations of a small magnitude (p <0.05). These results indicate that participants use different postural strategies pertaining to circumstances. Further, the moment across the ankle decreased with repetitions of the same perturbation (p <0.05), and CCI tended to remain unchanged even in response to a different perturbation following repetition of the same perturbation (p <0.05). These findings suggest that ankle muscle contraction and co-contraction play different roles in regaining and maintaining postural stability. This study demonstrates that ankle moment and stiffness are not correlated in response to external perturbations. © 2018 Kim, Hwang. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
    Keyword
    center of pressure
    Ankle Joint
    Postural Balance--physiology
    Identifier to cite or link to this item
    https://www.scopus.com/inward/record.uri?eid=2-s2.0-85057469619&doi=10.1371%2fjournal.pone.0207667&partnerID=40&md5=bb7eca95023ffe9ebea6ab093a8f4269; http://hdl.handle.net/10713/8774
    ae974a485f413a2113503eed53cd6c53
    10.1371/journal.pone.0207667
    Scopus Count
    Collections
    UMB Open Access Articles 2018

    entitlement

    Related articles

    • Compensatory strategies during walking in response to excessive muscle co-contraction at the ankle joint.
    • Authors: Wang R, Gutierrez-Farewik EM
    • Issue date: 2014 Mar
    • Ankle muscle responses during perturbed walking with blocked ankle joints.
    • Authors: Vlutters M, van Asseldonk EHF, van der Kooij H
    • Issue date: 2019 May 1
    • Ankle muscle co-contractions during quiet standing are associated with decreased postural steadiness in the elderly.
    • Authors: Vette AH, Sayenko DG, Jones M, Abe MO, Nakazawa K, Masani K
    • Issue date: 2017 Jun
    • Lower limb joint stiffness and muscle co-contraction adaptations to instability footwear during locomotion.
    • Authors: Apps C, Sterzing T, O'Brien T, Lake M
    • Issue date: 2016 Dec
    • Segmental reflexes and ankle joint stiffness during co-contraction of antagonistic ankle muscles in man.
    • Authors: Nielsen J, Sinkjaer T, Toft E, Kagamihara Y
    • Issue date: 1994
    DSpace software (copyright © 2002 - 2021)  DuraSpace
    Quick Guide | Policies | Contact Us | UMB Health Sciences & Human Services Library
    Open Repository is a service operated by 
    Atmire NV
     

    Export search results

    The export option will allow you to export the current search results of the entered query to a file. Different formats are available for download. To export the items, click on the button corresponding with the preferred download format.

    By default, clicking on the export buttons will result in a download of the allowed maximum amount of items.

    To select a subset of the search results, click "Selective Export" button and make a selection of the items you want to export. The amount of items that can be exported at once is similarly restricted as the full export.

    After making a selection, click one of the export format buttons. The amount of items that will be exported is indicated in the bubble next to export format.