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EFFECTS OF ECCENTRIC TRAINING ON THE MECHANICAL AND GEOMETRICAL PROPERTIES OF THE MUSCLE-TENDON PLANTAR FLEXORS SYSTEM
Authors: Ben Jeddou I., Ben Salah F. Z. , Arfa Y. , Dustin c.
Number of views: 289
Aim: Determine the adjustments to the structures of the musculo-tendinous system of the Plantar flexors of the ankle 10
weeks of eccentric training, as well as the geometry of the triceps surae and muscles of the tendon of Achilles and the
mechanical properties of the elastic components of the rheological model of Zajac (1989).
Methods and equipment: Sixty two topics were randomly distributed in a training group (GE, n = 31, 5 beginnings, 6
boxers, 5 wrestlers, 7 jumpers in lengths and 8 basketball: 20.9 ± 2.6 years, 178.1 ± 8.3 cm, 68.4 ± 9.2 kg) and a group
control (GC, n = 31, students of the Military Academy of sports: 23.6 ± 1.8 years, 176.6 ± 11.4 cm 72.0 ± 7.7 kg). All
subjects were involved in regular sporting activity (10.5 ± 6.2 hours per week) and have not changed their usual activity
during the duration of the study. The 3 experimental sessions were carried out in random order one to two weeks before the
start of the training Protocol (pre-test) then a week after the end of the 10 weeks of training (post-test).
Parameters studied: Characterization of the geometry of the muscles of the triceps surae, tendon of Achilles and the
stiffness of these and properties mechanical tendon and the stiffness of the PRC.
Results: The results showed that the mechanical properties of the tendon and muscle adapt specific and different way
depending on the type of training to optimize the transmission process of skeletal muscle tension and storage-restitution of
the elastic potential energy during movement.
Conclusion: The 10 weeks of eccentric training did not alter performance vertical relaxation, flexibility, and strength of the
trained subjects. Despite this lack of evolution of functional parameters, eccentric training would induce rather at the level of
the intrinsic mechanical properties of muscle tissue (decrease in stiffness of these1) on the mechanical and geometrical
properties of the tendon. The nature of the adaptations of the mechanical properties of the muscle and the tendon is
associated with a change in intrinsic mechanical properties of muscle and tendon tissue rather than a change to the level of
the geometric parameters of the muscle and the tendon.
Keywords: Eccentric training, flexibility, elastic component, musculo-articular stiffness, muscle architecture,