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Muscle architecture adaptations to knee extensor eccentric training: Rectus femoris vs. vastus lateralis
Author(s) -
Baroni Bruno Manfredini,
Geremia Jeam Marcel,
Rodrigues Rodrigo,
Azevedo Franke Rodrigo,
Karamanidis Kiros,
Vaz Marco Aurélio
Publication year - 2013
Publication title -
muscle and nerve
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.025
H-Index - 145
eISSN - 1097-4598
pISSN - 0148-639X
DOI - 10.1002/mus.23785
Subject(s) - muscle architecture , eccentric , eccentric training , fascicle , medicine , anatomy , physical medicine and rehabilitation , vastus lateralis muscle , ultrasonography , knee flexion , skeletal muscle , surgery , physics , quantum mechanics
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