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Authors
Tamura, Atsutaka Nagoya Institute of Technology / Tottori University Researchers DB KAKEN
Matsumoto, Takeo Nagoya Institute of Technology / Nagoya University
Keywords
stress relaxation
muscle fiber bundle
uniaxial stretch
viscoelasticity
elastic response
traumatic injury
Abstract
BackgroundThe mechanical characterization of skeletal muscle under high-rate loading regimes is important for predicting traumatic injuries due to traffic accidents and contact sports. However, it is difficult to perform dynamic mechanical tests at rates relevant to such rapid loading events. MethodsIn the present study, a series of stress relaxation tests were conducted on rabbit hind-limb muscle fiber bundles using a custom tensile tester. Using relatively moderate loading conditions compared to those typically associated with traumatic injuries, the passive stress-decaying mechanical properties of muscle fiber bundles were characterized. In addition, stress relaxation responses to various ramp-hold stretches were theoretically predicted by a custom-built code. FindingsThe results showed that the muscle fiber bundles exhibit greater stress relaxation at higher loading rates and greater stretch magnitudes. Based on these results, the data points representing the “elastic” stress–strain tensile behavior typical of traumatic injury were extrapolated using curve fitting. The theoretical model revealed rate-dependent characteristics of the muscle fiber bundles under traumatic loading conditions, which would result in tensile strengths of 300–500 kPa at the maximum engineering strain of 54%. This strength is on the order of magnitude as the maximum isometric stress of an active muscle contraction. InterpretationThe proposed numerical model is expected to serve as a powerful research tool to investigate injury mechanisms of the skeletal muscle. Moreover, the elastic response that was theoretically predicted here will be useful in the development of effective countermeasures to prevent traumatic injuries due to rapid loading events.
Publisher
Elsevier
Content Type
Journal Article
Link
ISSN
02680033
Journal Title
Clinical Biomechanics
Volume
69
Start Page
184
End Page
190
Published Date
2019-10
Publisher-DOI
Text Version
Author
Rights
(C) 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/
Citation
Tamura, Atsutaka. Hongu, Jun-ichi. Matsumoto, Takeo. et al. Theoretical elastic tensile behavior of muscle fiber bundles in traumatic loading events. Clinical Biomechanics. 69. 184-190. 2019-10-31.
Department
Faculty of Engineering/Graduate School of Engineering
Language
English
pii
S0268-0033(18)30708-3