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01-10-2014 | Original Article

Decoupling of laxity and cortical activation in functionally unstable ankles during joint loading

Authors: Alan R. Needle, C. Buz Swanik, Michael Schubert, Kirsten Reinecke, William B. Farquhar, Jill S. Higginson, Thomas W. Kaminski, Jochen Baumeister

Published in: European Journal of Applied Physiology | Issue 10/2014

Abstract

Purpose

Recent studies have highlighted central nervous system alterations following ligamentous injury that may contribute to joint instability. However, research has not observed cortical responses to joint loading or sensory changes in the context of joint laxity following injury.

Methods

Forty-two subjects were stratified into healthy (CON), unstable (UNS), and coper (COP) groups using ankle injury and instability history. Event-related desynchronization (%) from electroencephalography quantified somatosensory cortex activity as the ankle was loaded using an arthrometer.

Results

Cortical activation increased as the ankle was loaded (F = 63.05, p < 0.001), but did not differ between groups (F = 1.387, p = 0.268), despite greater laxity in UNS (F = 3.58, p = 0.038).

Conclusions

Increased somatosensory cortex activity was observed with joint loading; however, though UNS demonstrated a degree of mechanical instability, no differences in magnitude of cortical activation were observed. Continued research should explore how the relationship between cortical activation and joint stiffness is affected following ligamentous injury.

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Title: Decoupling of laxity and cortical activation in functionally unstable ankles during joint loading
Authors: Alan R. Needle
C. Buz Swanik
Michael Schubert
Kirsten Reinecke
William B. Farquhar
Jill S. Higginson
Thomas W. Kaminski
Jochen Baumeister
Publication date: 01-10-2014
Publisher: Springer Berlin Heidelberg
Published in: European Journal of Applied Physiology / Issue 10/2014
Print ISSN: 1439-6319
Electronic ISSN: 1439-6327
DOI: https://doi.org/10.1007/s00421-014-2929-3

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Decoupling of laxity and cortical activation in functionally unstable ankles during joint loading

Abstract

Purpose

Methods

Results

Conclusions

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Abstract

Purpose

Methods

Results

Conclusions

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