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.
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.
Authors: Matt S Stock; Jacob A Mota; Ryan N DeFranco; Katherine A Grue; A Unique Jacobo; Eunhee Chung; Jordan R Moon; Jason M DeFreitas; Travis W Beck Journal: Eur J Appl Physiol Date: 2017-03-20 Impact factor: 3.078
Authors: Kayla D Seymore; Zachary J Domire; Paul DeVita; Patrick M Rider; Anthony S Kulas Journal: Eur J Appl Physiol Date: 2017-03-09 Impact factor: 3.078
Authors: Maria João Valamatos; Francisco Tavares; Rute M Santos; António P Veloso; Pedro Mil-Homens Journal: Eur J Appl Physiol Date: 2018-07-07 Impact factor: 3.078
Authors: Claudia Ferreira Gomes da Silva; Felipe Xavier de Lima E Silva; Karoline Baptista Vianna; Gabriel Dos Santos Oliveira; Marco Aurélio Vaz; Bruno Manfredini Baroni Journal: Braz J Phys Ther Date: 2018-03-28 Impact factor: 3.377
Authors: S Garcia-Vicencio; E Coudeyre; V Kluka; C Cardenoux; A-G Jegu; A-V Fourot; S Ratel; V Martin Journal: Int J Obes (Lond) Date: 2015-08-19 Impact factor: 5.095