Impairment-Based Rehabilitation Increases Lower Leg Muscle Volumes and Strength in Chronic Ankle Instability Patients: A Preliminary Study

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dc.contributor.author Feger, MA en
dc.contributor.author Donovan, L en
dc.contributor.author Herb, CC en
dc.contributor.author Handsfield, Geoffrey en
dc.contributor.author Blemker, SS en
dc.contributor.author Hart, JM en
dc.contributor.author Saliba, SA en
dc.contributor.author Abel, MF en
dc.contributor.author Park, JS en
dc.contributor.author Hertel, J en
dc.date.accessioned 2018-10-10T02:30:46Z en
dc.date.issued 2019-07 en
dc.identifier.citation Journal of Sport Rehabilitation 28:5 450-458 Jul 2019 en
dc.identifier.issn 1056-6716 en
dc.identifier.uri http://hdl.handle.net/2292/40363 en
dc.description.abstract Context: Patients with chronic ankle instability (CAI) have demonstrated atrophy of foot and ankle musculature and deficits in ankle strength. The effect of rehabilitation on muscle morphology and ankle strength has not previously been investigated in patients with CAI. Objective: Our objective was to analyze the effect of impairment-based rehabilitation on intrinsic and extrinsic foot and ankle muscle volumes and strength in patients with CAI. Design: Controlled laboratory study. Setting: Laboratory. Patients: Five young adults with CAI. Intervention: Twelve sessions of supervised impairment-based rehabilitation that included range of motion, strength, balance, and functional exercises. Main Outcome Measures: Measures of extrinsic and intrinsic foot muscle volume and ankle strength measured before and after 4 weeks of supervised rehabilitation. Novel fast-acquisition magnetic resonance imaging was used to scan from above the femoral condyles through the entire foot. The perimeter of each muscle was outlined on each axial slice and then the 2-dimensional area was multiplied by the slice thickness (5 mm) to calculate muscle volume. Plantar flexion, dorsiflexion, inversion, and eversion isometric strength were measured using a hand-held dynamometer. Results: Rehabilitation resulted in hypertrophy of all extrinsic foot muscles except for the flexor hallucis longus and peroneals. Large improvements were seen in inversion, eversion, and plantar flexion strength following rehabilitation. Effect sizes for significant differences following rehabilitation were all large and ranged from 1.54 to 3.35. No significant differences were identified for intrinsic foot muscle volumes. Conclusion: Preliminary results suggest that impairment-based rehabilitation for CAI can induce hypertrophy of extrinsic foot and ankle musculature with corresponding increases in ankle strength. en
dc.publisher Human Kinetics en
dc.relation.ispartofseries Journal of Sport Rehabilitation en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. en
dc.rights Accepted author manuscript version reprinted, by permission, from Journal of Sport Rehabilitation 28:5 450-458 Jul 2019, http://dx.doi.org/10.1123/jsr.2017-0136. © Human Kinetics, Inc. en
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm en
dc.rights.uri https://journals.humankinetics.com/page/copyright en
dc.title Impairment-Based Rehabilitation Increases Lower Leg Muscle Volumes and Strength in Chronic Ankle Instability Patients: A Preliminary Study en
dc.type Journal Article en
dc.identifier.doi 10.1123/jsr.2017-0136 en
pubs.issue 5 en
pubs.begin-page 450 en
pubs.volume 28 en
dc.rights.holder Copyright: Human Kinetics en
pubs.end-page 458 en
dc.rights.accessrights http://purl.org/eprint/accessRights/OpenAccess en
pubs.subtype Article en
pubs.elements-id 740511 en
pubs.org-id Bioengineering Institute en
pubs.record-created-at-source-date 2018-05-18 en
pubs.dimensions-id 29405809 en


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