1. Training-induced increase in Achilles tendon stiffness affects tendon strain pattern during running
- Author
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Amelie Werkhausen, Neil J. Cronin, Kirsten Albracht, Gøran Paulsen, Askild V. Larsen, Jens Bojsen-Møller, and Olivier R. Seynnes
- Subjects
Achilles tendon ,Stiffness ,Running ,Tendon properties ,Architectural gear ratio ,Gastrocnemius ,Medicine ,Biology (General) ,QH301-705.5 - Abstract
Background During the stance phase of running, the elasticity of the Achilles tendon enables the utilisation of elastic energy and allows beneficial contractile conditions for the triceps surae muscles. However, the effect of changes in tendon mechanical properties induced by chronic loading is still poorly understood. We tested the hypothesis that a training-induced increase in Achilles tendon stiffness would result in reduced tendon strain during the stance phase of running, which would reduce fascicle strains in the triceps surae muscles, particularly in the mono-articular soleus. Methods Eleven subjects were assigned to a training group performing isometric single-leg plantarflexion contractions three times per week for ten weeks, and another ten subjects formed a control group. Before and after the training period, Achilles tendon stiffness was estimated, and muscle-tendon mechanics were assessed during running at preferred speed using ultrasonography, kinematics and kinetics. Results Achilles tendon stiffness increased by 18% (P
- Published
- 2019
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