In vivo passive mechanical properties of skeletal muscle improve with massage-like loading following eccentric exercise

JOURNAL OF BIOMECHANICS

卷:45

Article

Haas, Caroline^1,2  Best, Thomas M.^1,2  Wang, Qian¹  Butterfield, Timothy A.³  Zhao, Yi¹ 

[1] Ohio State Univ, Dept Biomed Engn, Columbus, OH 43210 USA

[2] Ohio State Univ, Dept Family Med, Columbus, OH 43210 USA

[3] Univ Kentucky, Coll Hlth Sci, Lexington, KY 40506 USA

关键词: Compressive loading;    Skeletal muscle;    Viscoelasticity;    Manual therapy;   

DOI  :  10.1016/j.jbiomech.2012.08.008

来源: Elsevier

【 摘 要 】

A quasi-linear viscoelasticity (QLV) model was used to study passive time-dependent responses of skeletal muscle to repeated massage-like compressive loading (MLL) following damaging eccentric exercise. Six skeletally mature rabbits were surgically instrumented with bilateral peroneal nerve cuffs for stimulation of the hindlimb tibialis anterior (TA) muscles. Following the eccentric exercise, rabbits were randomly assigned to a four-day MLL protocol mimicking deep effleurage (0.5 Hz, ION for 15 min or for 30 min). The contralateral hindlimb served as the exercised, no-MLL control for both MLL conditions. Viscoelastic properties of the muscle pre-exercise, post-exercise on Day 1, and pre- and post-MLL Day 1 through Day 4 were determined with ramp-and-hold tests. The instantaneous elastic response (AG(0)) increased following exercise (p < 0.05) and decreased due to both the 15 min and 30 min four-day MLL protocols (p < 0.05). Post-four days of MLL the normalized AG(0) decreased from post-exercise (Day 1,248.5%) to the post-MLL (Day 4,98.5%) (p < 0.05), compared to the no-MLL group (Day 4, 222.0%) (p < 0.05). Exercise and four-day MLL showed no acute or cumulative effects on the fast and slow relaxation coefficients (p > 0.05). This is the first experimental evidence of the effect of both acute (daily) and cumulative changes in viscoelastic properties of intensely exercised muscle due to ex vivo MLL. It provides a starting point for correlating passive muscle properties with mechanical effects of manual therapies, and may shed light on design and optimization of massage protocols. (C) 2012 Elsevier Ltd. All rights reserved.

【 授权许可】

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