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A Novel Stretching Platform for Applications in Cell and Tissue Mechanobiology
Published on: June 3, 2014
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Factors that influence muscle shear modulus during passive stretch.
1Department of Research, New York Chiropractic College, Seneca Falls, NY, United States.
Journal of Biomechanics
|June 27, 2015
Summary
Elastography measures muscle shear modulus, but its physiological meaning is unclear. This study models shear modulus, revealing it depends on muscle properties like specific tension and anisotropy, not just passive force.
Area of Science:
- Biomechanics
- Biomaterials
- Muscle Physiology
Background:
- Elastography is increasingly used to assess muscle shear modulus in various conditions.
- The physiological meaning of muscle shear modulus remains largely unknown, hindering clinical interpretation.
- This knowledge gap limits the application of elastography for understanding muscle biomechanics in health and disease.
Purpose of the Study:
- To derive a mathematical model for the physiological meaning of skeletal muscle resting shear modulus.
- To investigate the relationship between shear modulus and passive muscle force under stretching.
- To validate the model using ex-vivo animal data.
Main Methods:
- Developed a mathematical model based on the Hill-type passive force-length relationship.
- Analyzed resting shear modulus in slack muscles.
- Compared model predictions with ex-vivo animal data.
Main Results:
- Resting shear modulus is influenced by specific tension, passive force-length relationship parameters, and muscle anisotropy.
- The slope of the shear modulus-passive force relationship is primarily linked to muscle anatomical cross-sectional area.
- This slope is also affected by the normalized passive muscle force-length relationship and muscle anisotropy.
Conclusions:
- Muscle shear modulus under passive stretching has a strong linear relationship with passive muscle force.
- The absolute value of muscle shear modulus is influenced by mechanical, material, and architectural properties.
- Consideration of these properties is crucial for accurate interpretation of muscle shear modulus values in elastography.
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