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

Bruno Manfredini Baroni, Jeam Marcel Geremia, Rodrigo Rodrigues, Rodrigo De Azevedo Franke, Kiros Karamanidis, Marco Aurélio Vaz

Publikation: Beitrag in FachzeitschriftZeitschriftenaufsätzeForschungBegutachtung

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.

OriginalspracheEnglisch
ZeitschriftMuscle & nerve
Jahrgang48
Ausgabenummer4
Seiten (von - bis)498-506
Seitenumfang9
DOIs
PublikationsstatusVeröffentlicht - 01.10.2013

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