The passive properties of muscle fibers are velocity dependent

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 unclea...

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Bibliographic Details
Published in:Journal of biomechanics 2014-02, Vol.47 (3), p.687-693
Main Authors: Rehorn, Michael R, Schroer, Alison K, Blemker, Silvia S
Format: Article
Language:English
Subjects:
Animals
Behavior
Biomechanical Phenomena - physiology
Dynamics
Elasticity - physiology
Experiments
Fibers
Fourier transforms
Loading rate
Male
Mathematical models
Mice
Mice, Inbred C57BL
Models, Biological
Movements
Muscle Contraction - physiology
Muscle fiber mechanics
Muscle Fibers, Skeletal - physiology
Muscle, Skeletal - cytology
Muscle, Skeletal - physiology
Muscles
Muscular system
Musculoskeletal system
Nonlinear Dynamics
Physical Medicine and Rehabilitation
Proteins
QLV model
Stress, Mechanical
Stresses
Studies
Viscoelasticity
Viscosity
Weight-Bearing - physiology
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Summary: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 (0.1–10 L o /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 (0.1–3 L o /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.
ISSN:0021-9290
1873-2380
DOI:10.1016/j.jbiomech.2013.11.044