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Erschienen in: European Journal of Applied Physiology 6/2013

01.06.2013 | Original Article

Exercise-induced changes in triceps surae tendon stiffness and muscle strength affect running economy in humans

verfasst von: Kirsten Albracht, Adamantios Arampatzis

Erschienen in: European Journal of Applied Physiology | Ausgabe 6/2013

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Abstract

The purpose of the present study was to investigate whether increased tendon-aponeurosis stiffness and contractile strength of the triceps surae (TS) muscle-tendon units induced by resistance training would affect running economy. Therefore, an exercise group (EG, n = 13) performed a 14-week exercise program, while the control group (CG, n = 13) did not change their training. Maximum isometric voluntary contractile strength and TS tendon-aponeurosis stiffness, running kinematics and fascicle length of the gastrocnemius medialis (GM) muscle during running were analyzed. Furthermore, running economy was determined by measuring the rate of oxygen consumption at two running velocities (3.0, 3.5 ms−1). The intervention resulted in a ∼7 % increase in maximum plantarflexion muscle strength and a ∼16 % increase in TS tendon-aponeurosis stiffness. The EG showed a significant ∼4 % reduction in the rate of oxygen consumption and energy cost, indicating a significant increase in running economy, while the CG showed no changes. Neither kinematics nor fascicle length and elongation of the series-elastic element (SEE) during running were affected by the intervention. The unaffected SEE elongation of the GM during the stance phase of running, in spite of a higher tendon-aponeurosis stiffness, is indicative of greater energy storage and return and a redistribution of muscular output within the lower extremities while running after the intervention, which might explain the improved running economy.
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Metadaten
Titel
Exercise-induced changes in triceps surae tendon stiffness and muscle strength affect running economy in humans
verfasst von
Kirsten Albracht
Adamantios Arampatzis
Publikationsdatum
01.06.2013
Verlag
Springer-Verlag
Erschienen in
European Journal of Applied Physiology / Ausgabe 6/2013
Print ISSN: 1439-6319
Elektronische ISSN: 1439-6327
DOI
https://doi.org/10.1007/s00421-012-2585-4

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