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Title of Journal: Eur J Appl Physiol

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Abbravation: European Journal of Applied Physiology

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Springer Berlin Heidelberg

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DOI

10.1002/chin.199535061

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ISSN

1439-6327

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Inhomogeneous architectural changes of the quadric

Authors: Ryoichi Ema Taku Wakahara Naokazu Miyamoto Hiroaki Kanehisa Yasuo Kawakami
Publish Date: 2013/08/15
Volume: 113, Issue: 11, Pages: 2691-2703
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Abstract

Eleven recreationally active men 27 ± 2 years completed a 12week resistance training program for knee extensors Before and after the intervention muscle thicknesses fascicle lengths and pennation angles of the four muscles vastus lateralis vastus medialis vastus intermedius rectus femoris in several regions 2–4 regions per each muscle were measured using ultrasonography Anatomical crosssectional areas ACSAs at the same positions as the ultrasound measurements were determined from magnetic resonance imagesRelative increases in the ACSA muscle thickness and pennation angle of the rectus femoris were significantly greater than those of the vasti Relative increases in the ACSAs of the vastus lateralis and rectus femoris were significantly greater in the distal than in the proximal region and those in the muscle thickness and pennation angle of the vastus intermedius were significantly greater in the medial than in the lateral region Fascicle lengths did not change in any muscles The interrelations between muscle thickness and pennation angle remained unchanged after the intervention with a significant association between the relative changes of the two variablesThe current results indicate that 1 hypertrophy of the quadriceps femoris is associated with a proportional increase in pennation angle but not necessarily in fascicle length and 2 traininginduced changes in muscle size and pennation do not evenly occur among the quadriceps along or across a muscle

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