Abstract
In the field of computational biomechanics, the experimental evaluation of the material properties is crucial for the development of computational models that closely reproduce real organ systems. When simulations of muscle tissue are concerned, stress/strain relations for both passive and active behavior are required. These experimental relations usually exhibit certain variability. In this study, a set of material parameters involved in a 3D skeletal muscle model are determined by using a system biology approach in which the parameters are randomly varied leading to a population of models. Using a set of experimental results from an animal model, a subset of the entire population of models was selected. This reduced population predicted the mechanical response within the window of experimental observations. Hence, a range of model parameters, instead of a single set of them, was determined. Rat Tibialis Anterior muscle was selected for this study. Muscles (\(n=6\)) were activated through the sciatic nerve and during contraction the tissue pulled a weight fixed to the distal tendon (concentric contraction). Three different weights 1, 2 and 3 N were used and the time course of muscle stretch was analyzed obtaining values of (mean \(\pm\) standard deviation): \(0.714\pm 0.01\), \(0.808\pm 0.060\) and \(0.851\pm 0.033\) respectively. A paired two-sided sign rank test showed significant differences between the muscle response for the three weights (\(p<0.01\)). This study shows that the Monte Carlo method could be used for determine muscle characteristic parameters considering the variability of the experimental population.
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Acknowledgements
The authors gratefully acknowledge research support from the Spanish Ministry of Economy and Competitiveness (Projects DPI2011-27939-C02-01), the Department of Industry and Innovation (Government of Aragon) and also support from the University of Zaragoza through the research Project JIUZ-2012-TEC-05 and the predoctoral Grant of the Department of Industry and Innovation (Government of Aragon). The authors also want to thank the Tissue Characterization Platform of CIBER-BBN for technical support during the experimental tests. CIBER-BBN is an initiative funded by the VI National R&D&i Plan 2008–2011, Iniciativa Ingenio 2010, Consolider Program, CIBER Actions and financed by the Instituto de Salud Carlos III with assistance from the European Regional Development Fund.
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Associate Editor Stefan M. Duma oversaw the review of this article.
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Sierra, M., Miana-Mena, F.J., Calvo, B. et al. On Using Model Populations to Determine Mechanical Properties of Skeletal Muscle. Application to Concentric Contraction Simulation. Ann Biomed Eng 43, 2444–2455 (2015). https://doi.org/10.1007/s10439-015-1279-6
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DOI: https://doi.org/10.1007/s10439-015-1279-6