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The mechanics of agonistic muscles

de Brito Fontana, Heiliane ; Han, Seong-won ; Sawatsky, Andrew ; Herzog, Walter

Journal of biomechanics, 2018-10, Vol.79, p.15-20 [Periódico revisado por pares]

United States: Elsevier Ltd

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Título:
The mechanics of agonistic muscles
Autor: de Brito Fontana, Heiliane ; Han, Seong-won ; Sawatsky, Andrew ; Herzog, Walter
Assuntos: Activation ; Animals ; Biomechanical Phenomena ; Biomechanics ; Conflicts of interest ; Distribution problem ; Electromyography ; Female ; Force ; Force-length relationship ; Hypotheses ; Intermuscular force transmission ; Intermuscular pressure ; Isometric Contraction - physiology ; Joints - physiology ; Knee ; Measurement methods ; Mechanics (physics) ; Muscle contraction ; Muscle coordination ; Muscle function ; Muscle properties ; Muscle redundancy ; Muscles ; Muscular function ; Quadriceps femoris ; Quadriceps muscle ; Quadriceps Muscle - physiology ; Rabbits ; Torque ; Torque-angle relationship
É parte de: Journal of biomechanics, 2018-10, Vol.79, p.15-20
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
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Descrição: In this study, we tested two assumptions that have been made in experimental studies on muscle mechanics: (i) that the torque-angle properties are similar among agonistic muscles crossing a joint, and (ii) that the sum of the torque capacity of individual muscles adds up to the torque capacity of the agonist group. Maximum isometric torque measurements were made using a specifically designed animal knee extension dynamometer for the intact rabbit quadriceps muscles (n = 10) for knee angles between 60 and 120°. The nerve branches of the vastus lateralis (VL), vastus medialis (VM) and rectus femoris (RF) muscles were carefully dissected, and a custom made nerve cuff electrode was implanted on each branch. Knee extensor torques were measured for four maximal activation conditions at each knee angle: VL activation, VM activation, RF activation, and activation of all three muscles together. With the exception of VL, the torque-angle relationships of the individual muscles did not have the shape of the torque-angle relationship obtained when all muscles were activated simultaneously. Furthermore, the maximum torque capacity obtained by adding the individual torque capacities of VL, VM and RF was approximately 20% higher than the torques produced when the three muscles were activated simultaneously. These results bring into question our understanding of in-vivo muscle contraction and challenge assumptions that are sometimes made in human and animal muscle force analyses.
Editor: United States: Elsevier Ltd
Idioma: Inglês

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The mechanics of agonistic muscles

de Brito Fontana, Heiliane ; Han, Seong-won ; Sawatsky, Andrew ; Herzog, Walter

United States: Elsevier Ltd

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