Time-course effect of exercise-induced muscle damage on localized muscle mechanical properties assessed using elastography

Lacourpaille, L., Nordez, A., Hug, F., Couturier, A., Dibie, C. and Guilhem, G. (2014) Time-course effect of exercise-induced muscle damage on localized muscle mechanical properties assessed using elastography. Acta Physiologica, 211 1: 135-146. doi:10.1111/apha.12272


Author Lacourpaille, L.
Nordez, A.
Hug, F.
Couturier, A.
Dibie, C.
Guilhem, G.
Title Time-course effect of exercise-induced muscle damage on localized muscle mechanical properties assessed using elastography
Journal name Acta Physiologica   Check publisher's open access policy
ISSN 1748-1708
1748-1716
Publication date 2014
Year available 2014
Sub-type Article (original research)
DOI 10.1111/apha.12272
Open Access Status
Volume 211
Issue 1
Start page 135
End page 146
Total pages 12
Place of publication Chichester, West Sussex, United Kingdom
Publisher Blackwell Publishing Ltd
Collection year 2015
Language eng
Subject 1314 Physiology
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, 1 h, 48 h and 21 days after three sets of ten maximal isokinetic eccentric contractions performed at 120° s-1. Results: The shear elastic modulus of the elbow flexors significantly increased 1 h (+46%; P = 0.005), with no significant change at 48 h and 21D, post-exercise. In contrast, T2 was not modified at 1 h but significantly increased at 48 h (+15%; P < 0.05). The increase in shear elastic modulus was more pronounced at long muscle lengths and reached a similar extent in the different regions of the elbow flexors. The normalized hysteresis area of shear elastic modulus-length relationship for the biceps brachii increased 1 h post-exercise (31%) in comparison with the pre-exercise value (18%), but was not significantly altered after five stretching cycles (P = 0.63). Conclusion: Our results show homogeneous changes in muscle shear elastic modulus within and between elbow flexors. The greater increase in shear elastic modulus observed at long muscle lengths suggests the putative involvement of both cross-bridges number and titin in the modifications of muscle shear elastic modulus after damaging exercise.
Keyword Eccentric contractions
Hysteresis area
Oedema
Passive tension
Supersonic shear imaging
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2015 Collection
School of Health and Rehabilitation Sciences Publications
 
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Created: Fri, 09 May 2014, 15:24:36 EST by Francois Hug on behalf of School of Health & Rehabilitation Sciences