| Literature DB >> 24360198 |
Michael R Rehorn1, Alison K Schroer1, Silvia S Blemker2.
Abstract
The passive properties of skeletal muscle play an important role in muscle function. While the passive quasi-static elastic properties of muscle fibers have been well characterized, the dynamic visco-elastic passive behavior of fibers has garnered less attention. In particular, it is unclear how the visco-elastic properties are influenced by lengthening velocity, in particular for the range of physiologically relevant velocities. The goals of this work were to: (i) measure the effects of lengthening velocity on the peak stresses within single muscle fibers to determine how passive behavior changes over a range of physiologically relevant lengthening rates (0.1-10Lo/s), and (ii) develop a mathematical model of fiber viscoelasticity based on these measurements. We found that passive properties depend on strain rate, in particular at the low loading rates (0.1-3Lo/s), and that the measured behavior can be predicted across a range of loading rates and time histories with a quasi-linear viscoelastic model. In the future, these results can be used to determine the impact of viscoelastic behavior on intramuscular stresses and forces during a variety of dynamic movements.Entities:
Keywords: Muscle fiber mechanics; QLV model; Viscoelasticity
Mesh：
Year: 2013 PMID： 24360198 PMCID： PMC3925397 DOI： 10.1016/j.jbiomech.2013.11.044
Source DB: PubMed Journal: J Biomech ISSN： 0021-9290 Impact factor: 2.712