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Frog semitendinosis tendon load-strain and stress-strain properties during passive loading
R L Lieber1, M E Leonard, C G Brown
1Division of Orthopedics and Rehabilitation, Veterans Administration Medical Center, San Diego, California.
The American Journal of Physiology
|July 1, 1991
Summary
The frog semitendinosis (ST) tendon exhibits unique mechanical properties, with varying stiffness and lower modulus compared to mammals. This tendon operates in a
Area of Science:
- Biomechanics
- Tendon Physiology
- Comparative Anatomy
Background:
- Understanding the mechanical properties of muscle-tendon units is crucial for biomechanics and motor control.
- The frog semitendinosis (ST) tendon's mechanical behavior under physiological loads is not well-characterized.
Purpose of the Study:
- To measure and compare the mechanical properties of the frog ST tendon, bone-tendon junction, and aponeurosis.
- To determine the stress-strain relationship and stiffness of these tissues under passive loading up to maximum isometric tension (Po).
Main Methods:
- Passive mechanical loading of the frog ST tendon, bone-tendon junction, and aponeurosis.
- Measurement of stiffness, strain, Young's modulus, and stress at maximum isometric tension (Po).
Main Results:
- Tendon stiffness was approximately four times greater than aponeurosis stiffness.
- Frog ST tendon Young's modulus (188 MPa) and stress at Po (3 MPa) were significantly lower than reported values for mammalian tendons.
- Tendon strain at Po was approximately 2% after passive loading.
Conclusions:
- Different regions of the frog ST tendon possess distinct mechanical properties.
- The frog ST tendon operates physiologically within the 'toe' region of the stress-strain curve, exhibiting variable stiffness that increases with load.
- These findings have implications for understanding muscle-tendon design and neuromotor control strategies in frogs and potentially other species.