In this study we utilize the concept of synergy formation as a simplifying control strategy to manage the high number of degrees of freedom presented in the maintenance of the posture of the shoulder joint. We address how to find the muscle synergy recruitment map to the biomechanical demands (biaxial external torque) during an isometric shoulder task. We use a numerical optimization based shoulder model to obtain muscle activation levels when a biaxial external isometric torque is exposed at the shoulder glenohumeral joint. In the numerical simulations, different shoulder torque vectors parallel to the horizontal plane are considered. For each selected direction for the torque, the resulting muscle activation data are calculated and then used for grouping muscles in some fixed element synergies by nonnegative matrix factorization method Next, the muscle synergies are converted from activation level to the torque space to see how muscle synergy recruitment addresses the torque production in a specific direction at the shoulder joint. The results confirmed our expectation that the few dominant synergies are sufficient to address the torque vectors in directions which coincide to the basic vectors of torque space, such that each muscle contributed to more than one synergy.
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ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis
July 12–14, 2010
Istanbul, Turkey
Conference Sponsors:
- International
ISBN:
978-0-7918-4915-6
PROCEEDINGS PAPER
Muscle Synergies Based on a Biomechanical Biaxial Isometric Shoulder Model Minimizing Fatigue
Mohamadreza Nassajian Moghadam,
Mohamadreza Nassajian Moghadam
Sharif University of Technology, Tehran, Iran
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Kamiar Aminian,
Kamiar Aminian
Ecole Polytechnique Fe´de´rale de Lausanne, Lausanne, Switzerland
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Mohsen Asghari,
Mohsen Asghari
Sharif University of Technology, Tehran, Iran
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Mohammad Parnianpour
Mohammad Parnianpour
Sharif University of Technology, Tehran, Iran
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Mohamadreza Nassajian Moghadam
Sharif University of Technology, Tehran, Iran
Kamiar Aminian
Ecole Polytechnique Fe´de´rale de Lausanne, Lausanne, Switzerland
Mohsen Asghari
Sharif University of Technology, Tehran, Iran
Mohammad Parnianpour
Sharif University of Technology, Tehran, Iran
Paper No:
ESDA2010-25230, pp. 797-804; 8 pages
Published Online:
December 28, 2010
Citation
Nassajian Moghadam, M, Aminian, K, Asghari, M, & Parnianpour, M. "Muscle Synergies Based on a Biomechanical Biaxial Isometric Shoulder Model Minimizing Fatigue." Proceedings of the ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis. ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, Volume 1. Istanbul, Turkey. July 12–14, 2010. pp. 797-804. ASME. https://doi.org/10.1115/ESDA2010-25230
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