Volume 48, Issue 4 pp. 498-506
Research Article

Muscle architecture adaptations to knee extensor eccentric training: Rectus femoris vs. vastus lateralis

Bruno Manfredini Baroni MSc

Corresponding Author

Bruno Manfredini Baroni MSc

Exercise Research Laboratory, School of Physical Education, Federal University of Rio Grande do Sul, Porto Alegre, Brazil

Correspondence to: B.M. Baroni; e-mail: [email protected]Search for more papers by this author
Jeam Marcel Geremia MSc

Jeam Marcel Geremia MSc

Exercise Research Laboratory, School of Physical Education, Federal University of Rio Grande do Sul, Porto Alegre, Brazil

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Rodrigo Rodrigues PE

Rodrigo Rodrigues PE

Exercise Research Laboratory, School of Physical Education, Federal University of Rio Grande do Sul, Porto Alegre, Brazil

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Rodrigo De Azevedo Franke PE

Rodrigo De Azevedo Franke PE

Exercise Research Laboratory, School of Physical Education, Federal University of Rio Grande do Sul, Porto Alegre, Brazil

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Kiros Karamanidis PhD

Kiros Karamanidis PhD

Institute of Biomechanics and Orthopaedics, German Sport University of Cologne, Cologne, Germany

Faculty of Mathematics and Technology, RheinAhrCampus Remagen, Koblenz University of Applied Sciences, Koblenz, Germany

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Marco Aurélio Vaz PhD

Marco Aurélio Vaz PhD

Exercise Research Laboratory, School of Physical Education, Federal University of Rio Grande do Sul, Porto Alegre, Brazil

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First published: 30 January 2013
Citations: 99

This study was supported by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES Brazil), Financiadora de Estudos e Projetos (FINEP Brazil), and Conselho Nacional de Pesquisa (CNPq Brazil).

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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