Accepted Article
Received Date : 20-Jul-2013
Revision Requested: 15-Oct-2013 Revised Date : 25-Feb-2014 Accepted Date : 03-Mar-2014 Article type
: Regular Paper
Time-course effect of exercise-induced muscle damage on localized muscle mechanical properties assessed using elastography
Lilian LACOURPAILLE2, Antoine NORDEZ2, François HUG2,3, Antoine COUTURIER1, Christian DIBIE1, Gaël GUILHEM1*
1
French National Institute of Sport (INSEP), Research and Medical Departments, Laboratory Sport,
Expertise, Performance, Paris, France 2
University of Nantes, Laboratory “Motricité, Interactions, Performance” (EA 4334), Nantes, France
3
The University of Queensland, NHMRC Centre of Clinical Research Excellence in Spinal Pain, Injury
and Health, School of Health and Rehabilitation Sciences, Brisbane, Australia
Running title: Changes in shear elastic modulus after muscle damage *Correspondence and reprints: Gaël Guilhem, PhD French National Institute of Sport (INSEP)
This article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process which may lead to differences between this version and the Version of Record. Please cite this article as an 'Accepted Article', doi: 10.1111/apha.12272 This article is protected by copyright. All rights reserved.
Accepted Article
Research Department Laboratory Sport, Expertise, Performance 11, avenue du Tremblay 75012 Paris France Phone: +33 (0)1 41 74 43 36 Fax: +33 (0)1 41 74 45 35 E-mail: [email protected]
Abstract Aim: Changes in muscle stiffness after exercise-induced muscle damage have been classically inferred from passive torque-angle curves. Elastographic techniques can be used to estimate the shear modulus of a localized muscular area. This study aimed to quantify the changes in shear elastic modulus in different regions of the elbow flexors after eccentric exercise and their relation to muscle length. Methods: Shear elastic modulus and transverse relaxation time (T2) were measured in the biceps brachii and brachialis muscles of sixteen participants, before, 1h, 48h and 21 days after 3 sets of 10 maximal isokinetic eccentric contractions performed at 120°.s-1. Results: The shear elastic modulus of the elbow flexors significantly increased 1h (+46%; P=0.005), with no significant change at 48h and 21D, post-exercise. In contrast, T2 was not modified at 1h but significantly increased at 48h (+15%; P
Received Date : 20-Jul-2013
Revision Requested: 15-Oct-2013 Revised Date : 25-Feb-2014 Accepted Date : 03-Mar-2014 Article type
: Regular Paper
Time-course effect of exercise-induced muscle damage on localized muscle mechanical properties assessed using elastography
Lilian LACOURPAILLE2, Antoine NORDEZ2, François HUG2,3, Antoine COUTURIER1, Christian DIBIE1, Gaël GUILHEM1*
1
French National Institute of Sport (INSEP), Research and Medical Departments, Laboratory Sport,
Expertise, Performance, Paris, France 2
University of Nantes, Laboratory “Motricité, Interactions, Performance” (EA 4334), Nantes, France
3
The University of Queensland, NHMRC Centre of Clinical Research Excellence in Spinal Pain, Injury
and Health, School of Health and Rehabilitation Sciences, Brisbane, Australia
Running title: Changes in shear elastic modulus after muscle damage *Correspondence and reprints: Gaël Guilhem, PhD French National Institute of Sport (INSEP)
This article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process which may lead to differences between this version and the Version of Record. Please cite this article as an 'Accepted Article', doi: 10.1111/apha.12272 This article is protected by copyright. All rights reserved.
Accepted Article
Research Department Laboratory Sport, Expertise, Performance 11, avenue du Tremblay 75012 Paris France Phone: +33 (0)1 41 74 43 36 Fax: +33 (0)1 41 74 45 35 E-mail: [email protected]
Abstract Aim: Changes in muscle stiffness after exercise-induced muscle damage have been classically inferred from passive torque-angle curves. Elastographic techniques can be used to estimate the shear modulus of a localized muscular area. This study aimed to quantify the changes in shear elastic modulus in different regions of the elbow flexors after eccentric exercise and their relation to muscle length. Methods: Shear elastic modulus and transverse relaxation time (T2) were measured in the biceps brachii and brachialis muscles of sixteen participants, before, 1h, 48h and 21 days after 3 sets of 10 maximal isokinetic eccentric contractions performed at 120°.s-1. Results: The shear elastic modulus of the elbow flexors significantly increased 1h (+46%; P=0.005), with no significant change at 48h and 21D, post-exercise. In contrast, T2 was not modified at 1h but significantly increased at 48h (+15%; P
