The postural control can be optimized by the first movement initiation condition encountered when submitted to muscle fatigue |
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| Institution: | 1. Department of Internal Medicine, Neurology, Ghent University, Ghent University Hospital, De Pintelaan 185, 1K12A, B-9000 Ghent, Belgium;2. Department of Speech, Language and Hearing Sciences, Ghent University, Ghent University Hospital, De Pintelaan 185, 2P1, B-9000 Ghent, Belgium;3. Veiga de Almeida University, Rua Ibituruna, 108, Tijuca, Rio de Janeiro, Brazil;4. Department of Neurology, Ghent University Hospital, De Pintelaan 185,1K12A, B-9000 Ghent, Belgium;5. Department of physical therapy and motor rehabilitation, Ghent University Hospital, De Pintelaan 185, B-9000 Ghent, Belgium;6. MEDISIP, Department of Electronics and Information Systems, Ghent University – iMINDS Medical IT Department, Ghent University Hospital De Pintelaan 185, 5-Blok B, B-9000 Ghent, Belgium;7. Department of Neurosurgery, Ghent University Hospital, De Pintelaan 185, 4K12E, B-9000 Ghent, Belgium;8. Department of Surgery, Ghent University, De Pintelaan 185, 4K12E, B-9000 Ghent, Belgium;9. Faculty of Education, Health and Social Work, University College Ghent, Keramiekstraat 80, B-9000 Ghent, Belgium;1. Department of Industrial Engineering Baskent University, Ankara, Turkey;2. Department of Industrial Engineering Gazi University, Ankara, Turkey;1. Federal University of Paraiba, Brazil;2. Federal University of Pernambuco – UFPE, Recife, PE, Brazil;3. Postgraduate Program in Neuropsychiatry and Behavioral Sciences at the Federal University of Pernambuco – UFPE, Recife, PE, Brazil;1. CHRU de Brest;2. AP–HM;3. Centre hospitalier de Valenciennes;1. Laboratoire de psychologie des processus et conduites complexes, EA4431, université de Paris Ouest - Nanterre - La Défense, bureau C103a, 200, avenue de la République, 92001 Nanterre cedex, France;2. Laboratoire CLLE-LTC, UMR 5263, CNRS, université de Toulouse 2, EPHE, Maison de la recherche, 5, allées A.-Machado, 31058 Toulouse cedex, France |
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| Abstract: | We investigated whether and how the movement initiation condition (IC) encountered during the early movements performed following focal muscle fatigue affects the postural control of discrete ballistic movements. For this purpose, subjects performed shoulder flexions in a standing posture at maximal velocity under two movement IC, i.e., in self-paced conditions and submitted to a Stroop-like task in which participants had to trigger fast shoulder flexions at the presentation of incongruent colors. Shoulder flexion kinematics, surface muscle activity of focal and postural muscles as well as center-of-pressure kinematics were recorded. The initial IC and the order in which subjects were submitted to these two conditions were varied within two separate experimental sessions. IC schedule was repeated before and after fatigue protocols involving shoulder flexors. The aim of this fatigue procedure was to affect acceleration-generating capacities of focal muscles. In such conditions, the postural muscle activity preceding and accompanying movement execution is expected to decrease. Following fatigue, when subjects initially moved in self-paced conditions, postural muscle activity decreased and scaled to the lower focal peak acceleration. This postural strategy then transferred to the Stroop-like task. In contrast, when subjects initially moved submitted to the Stroop-like task, postural muscle activity did not decrease and this transferred to self-paced movements. Regarding the center-of-pressure peak velocity, which is indicative of the efficiency of the postural actions generated in stabilizing posture, no difference appeared between the two sessions post-fatigue. This highlights an optimization of the postural actions when subjects first moved in self-paced conditions, smaller postural muscle activation levels resulting in similar postural consequences. In conclusion, the level of neuromuscular activity associated with the postural control is affected and can be optimized by the initial movement IC experienced post-fatigue. Beyond the fundamental contributions arising from these results, we point out potential applications for trainers and sports instructors. |
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| Keywords: | Muscle fatigue Motor control Postural control Optimal control Control transfer |
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