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      Local architecture of the vastus intermedius is a better predictor of knee extension force than that of the other quadriceps femoris muscle heads.

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          Abstract

          The purpose of this study was to determine whether the muscle architecture of each head of the quadriceps femoris (QF) at multiple regions can be used to predict knee extension force. Muscle thickness and pennation angle were measured using sonographic images from multiple regions on each muscle of the QF with the knee flexed to 90°. The fascicle lengths of the rectus femoris (RF), vastus lateralis (VL) and vastus intermedius (VI) muscles were estimated based on sonographic images taken along the length of the thigh. The muscle architecture of the vastus intermedius was determined in two separate locations using sonographic images of the anterior (ant-VI) and lateral portions (lat-VI). The maximal voluntary contraction (MVC) was measured during isometric knee extension at a knee joint angle of 90°. The relationship between MVC force and muscle architecture was examined using a stepwise linear regression analysis with MVC force as the dependent variable. The muscle thickness of the ant-VI was selected as an independent variable in the first step of the linear regression analysis (R(2) = 0.66, P<0.01). In the second step, pennation angle of the lat-VI was added to the model (R(2) = 0.91, P<0.01). These results suggest that among the four muscles that make up the QF, the muscle architecture of the VI is the best predictor of knee extension force.

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          Author and article information

          Journal
          Clin Physiol Funct Imaging
          Clinical physiology and functional imaging
          Wiley
          1475-097X
          1475-0961
          Sep 2015
          : 35
          : 5
          Affiliations
          [1 ] Graduate School of Education and Human Development, Nagoya University, Nagoya, Japan.
          [2 ] Japan Society for the Promotion of Science, Tokyo, Japan.
          [3 ] School of Health and Sport Sciences, Chukyo University, Nagoya, Japan.
          [4 ] Research Center of Health, Physical Fitness & Sports, Nagoya University, Nagoya, Japan.
          Article
          10.1111/cpf.12173
          24915999

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