Muscle architecture adaptations to knee extensor eccentric training: Rectus femoris vs. vastus lateralis |
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| Authors: | Bruno Manfredini Baroni MSc Jeam Marcel Geremia MSc Rodrigo Rodrigues PE Rodrigo De Azevedo Franke PE Kiros Karamanidis PhD Marco Aurélio Vaz PhD |
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| Affiliation: | 1. Exercise Research Laboratory, School of Physical Education, Federal University of Rio Grande do Sul, , Brazil;2. Institute of Biomechanics and Orthopaedics, German Sport University of Cologne, , Cologne, Germany;3. Faculty of Mathematics and Technology, RheinAhrCampus Remagen, Koblenz University of Applied Sciences, , Koblenz, Germany |
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| Abstract: | ![]()
Introduction: Changes in muscle architecture induced by eccentric knee extensor training remain unclear, as well the adaptive responses of synergistic knee extensor muscles with different geometrical designs. Methods: Ultrasonography images were taken from rectus femoris (RF) and vastus lateralis (VL) of 20 male volunteers before and after a non‐training control period of 4 weeks, and additional evaluations were performed after 4, 8, and 12 weeks of isokinetic eccentric training. Results: RF and VL had significant changes in muscle architecture within the first 4 training weeks, and the adaptive response throughout the intervention was similar. Muscle thickness increased by around 7–10%, fascicle length increased 17–19%, and pennation angle was unchanged. Conclusions: Increased muscle thickness due to eccentric training was related to increased fascicle length and not to pennation angle changes. Although RF and VL have a different fascicular geometry, they had similar morphological adaptations to eccentric training. Muscle Nerve 48 : 498–506, 2013 |
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| Keywords: | eccentric exercise fascicular geometry muscle plasticity quadriceps femoris ultrasonography |
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