The role of biceps brachii and brachioradialis for the control of elbow flexion and extension movements |
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| Institution: | 1. Department of Biomedical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran;2. Engineering Research Center in Medicine and Biology, Science and Research Branch, Islamic Azad University, Tehran, Iran;1. Child Neurology and Psychiatry Unit, Catholic University, Rome, Italy;2. Unit of Neuromuscular and Neurodegenerative Disorders, Bambino Gesù Children''s Hospital, Rome, Italy;3. Department of Neurosciences and Nemo Sud Clinical Center, University of Messina, Messina, Italy;4. Cardiomiology and Medical Genetics, Department of Experimental Medicine, Second University of Naples, Naples, Italy;5. Department of Developmental Neuroscience, IRCCS Stella Maris, Pisa, Italy;6. Center of Myology and Neurodegenerative Disorders and Physical and Rehabilitation Medicine Unit, Istituto Giannina Gaslini, Genova, Italy;7. Neuromuscular Center, AOU Città della Salute e della Scienza, University of Torino, Turin, Italy;8. Department of Neurosciences, University of Padua, Padua, Italy;9. IRCCS Casimiro Mondino Foundation, Pavia, Italy;10. IRCCS Eugenio Medea, Bosisio Parini, Italy;11. Child Neurology and Psychiatry Unit, IRCCS Institute of Neurological Sciences, Bellaria Hospital, Bologna, Italy;12. Centro Clinico Nemo, Milan, Italy;13. Pediatric Neurology and Myopathology Units, Neurological Institute Carlo Besta, Milan, Italy;14. Biostatistics Unit, Department of Health Sciences, University of Genoa, Genoa, Italy |
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| Abstract: | How do synergistic muscles interact, when their contraction aims at stabilizing and fine-tuning a movement, which is induced by the antagonistic muscle? The aim of the study was to analyze the interaction of biceps and brachioradialis during fine-tuning control tasks in comparison to load bearing ones. The surface electromyogram of biceps, brachioradialis and triceps were examined in 15 healthy subjects in dynamic flexion and extension movements with different combinations of contraction levels, joint angles and angular velocities. The measurements were conducted in two configurations, where the torque due to an external load opposes the rotational direction of the elbow flexion (load bearing tasks) or the elbow extension (fine-tuning tasks).Whereas during load bearing control tasks, similar muscular activation of biceps and brachioradialis was observed for all joint angles, angular velocities and external loads, during fine-tuning control tasks a significant difference of the muscular activation of both flexors was observed for 1 kg, F(3.639, 47.305) = 2.864, p = 0.037, and 5 kg of external load, F(1.570, 21.976) = 6.834, p = 0.008.The results confirm the synergistic muscular activation of both flexors during load bearing tasks, but suggest different control strategies for both flexors when they comprise a fine-tuning control task. |
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| Keywords: | Biceps Brachioradialis Muscular activation Control Categorization |
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