Effects of distal and proximal arm muscles fatigue on multi-joint movement organization |
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Authors: | Anne-Fabienne Huffenus David Amarantini Nicolas Forestier |
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Affiliation: | (1) Laboratoire de Modélisation des Activités Sportives, Département STAPS, UFR-CISM, Université de Savoie, Campus Scientifique, 73376 Le Bourget du Lac Cedex, France;(2) Laboratoire Sport et Performance Motrice, UFR-APS, Université Joseph Fourier, Grenoble, France;(3) Laboratoire Adaptation Perceptivo-Motrice et Apprentissage, Université Paul Sabatier, Toulouse, France |
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Abstract: | To investigate the strategies developed by the central nervous system to compensate for fatigue in muscles, we studied the changes in the relative mechanical contribution of the joint torques in a multi-joint movement following an isometric exhaustion test. Eighteen male subjects performed throws, moving the arm in the horizontal plane, before and after two fatigue protocols. Muscular fatigue was induced either in the distal (extensor digitorum communis) or in the proximal (triceps brachii) agonist muscle of the arm. The kinematic, kinetic and electromyographic parameters of the movement were analysed. The subjects produced two different coordinations following the fatigue protocols. In the distal fatigue condition, the wrist angular velocity was maintained by decreasing elbow active torque. In the proximal fatigue condition, the compensatory strategy involved increasing the contribution of the wrist. In fact, the control of elbow and wrist was modified in order to compensate for the different mechanical effects. |
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Keywords: | Coordination Multi-joint movement Muscular fatigue Joint torques |
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