NDLI: Expecting ankle tilts and wearing an ankle brace influence joint control in an imitated ankle sprain mechanism during walking.

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Expecting ankle tilts and wearing an ankle brace influence joint control in an imitated ankle sprain mechanism during walking.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Gehring, Dominic Wissler, Sabrina Lohrer, Heinz Nauck, Tanja Gollhofer, Albert
Description	Author Affiliation: Gehring D ( Department of Sport and Sport Science, University of Freiburg, Germany. Electronic address: dominic.gehring@sport.uni-freiburg.de.); Wissler S ( Department of Sport and Sport Science, University of Freiburg, Germany.); Lohrer H ( Institute for Sports Medicine, Frankfurt, Germany.); Nauck T ( Institute for Sports Medicine, Frankfurt, Germany.); Gollhofer A ( Department of Sport and Sport Science, University of Freiburg, Germany.)
Abstract	A thorough understanding of the functional aspects of ankle joint control is essential to developing effective injury prevention. It is of special interest to understand how neuromuscular control mechanisms and mechanical constraints stabilize the ankle joint. Therefore, the aim of the present study was to determine how expecting ankle tilts and the application of an ankle brace influence ankle joint control when imitating the ankle sprain mechanism during walking. Ankle kinematics and muscle activity were assessed in 17 healthy men. During gait rapid perturbations were applied using a trapdoor (tilting with 24° inversion and 15° plantarflexion). The subjects either knew that a perturbation would definitely occur (expected tilts) or there was only the possibility that a perturbation would occur (potential tilts). Both conditions were conducted with and without a semi-rigid ankle brace. Expecting perturbations led to an increased ankle eversion at foot contact, which was mediated by an altered muscle preactivation pattern. Moreover, the maximal inversion angle (-7%) and velocity (-4%), as well as the reactive muscle response were significantly reduced when the perturbation was expected. While wearing an ankle brace did not influence muscle preactivation nor the ankle kinematics before ground contact, it significantly reduced the maximal ankle inversion angle (-14%) and velocity (-11%) as well as reactive neuromuscular responses. The present findings reveal that expecting ankle inversion modifies neuromuscular joint control prior to landing. Although such motor control strategies are weaker in their magnitude compared with braces, they seem to assist ankle joint stabilization in a close-to-injury situation.
File Format	HTM / HTML
ISSN	09666362
Issue Number	3
Volume Number	39
e-ISSN	18792219
Journal	Gait & Posture
Language	English
Publisher	Elsevier
Publisher Date	2014-03-01
Publisher Place	Great Britain (UK)
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Research Support, Non-u.s. Gov't Discipline Orthopedics Prevention & Control Humans Male Journal Article Physiopathology Young Adult Walking Ankle Joint Biomechanical Phenomena Braces Ankle Injuries Sprains And Strains Physiology Electromyography Joint Instability
Content Type	Text
Resource Type	Article
Subject	Orthopedics and Sports Medicine Rehabilitation Biophysics Sports Science

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Expecting ankle tilts and wearing an ankle brace influence joint control in an imitated ankle sprain mechanism during walking.

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