Eccentric training improves tendon biomechanical properties: a rat model
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(2) Introduction. The. • •. Eccentric = treatment of choice for tendinopathies. •. A minimum of 20 training sessions appears to be necessary. •. Morphological and biochemical changes in the tissue are not yet clear. Prolonged program of sub-maximal eccentric contractions reduced all symptoms of tendinopathy.
(3) Aim • To better define the biomechanical changes that affect healthy tendinous tissue after eccentric and concentric training.
(4) Materials & methods • The Institutional Animal Care and Use Ethics. Committee of the University of Liège approved the protocol used in this study.
(5) Materials & methods 18 rats Group U Untrained. Group C Concentrique. Group E Eccentrique. 6 rats. 6 rats. 6 rats. No physical exercise. Running on treadmill! (+15°, 17m/min, 1h, 3x/sem, 5 sem). Running on treadmill! (-15°, 17m/min, 1h, 3x/sem, 5 sem).
(6) Materials & methods • Tricipital tendon. !. • Patellar tendon !. • Achilles tendon. bilaterally.
(7) Materials & methods. • Biomechanical testing up to rupture after measurement . ! ! !. • Histological cross-section. Haematoxylin eosin. Masson’s trichrome.
(8) Results.
(9) Results.
(10) Discussion •. Improvement in the mechanical qualities : . eccentric training > absence of training. concentric training = absence of training. •. Some studies ➙ sub-maximal eccentric exercise reduces the tendency of the tendon to degenerate by increasing the collagen fiber content and/or by reducing the neovascularisation..
(11) Discussion • Mechanical strength per surface area = between the three groups. ➙ no modification in the quality of the histological structure. ➙ the higher resistance relies on an increase in the tendon cross-sectional area.
(12) Discussion • •. The physiological process = mechanotransduction. •. = non-neural physiological process, which contributes to the maintenance of normal musculoskeletal structure in the absence of an injury, and to healing after an injury. = range of phenomena through which the organism converts mechanical stress into cellular responses ➙ structural changes .
(13) Conclusion •. The mechanical properties of tendons in rats improve after specific training, especially following eccentric training. •. The higher resistance of trained tendons mostly results from an increase of the cross-sectional area although small modifications of the tissue architecture may also play a role. •. Our results partly explained how mechanical loading, especially in eccentric mode, could improve the healing of tendon.
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(15) Thank you !. http://hdl.handle.net/2268/164675.
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