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Age dependent changes of arterial wall viscoelasticity
P Antonov1, M Antonova, N Nikolova
1Specialized Hospital for Active Treatment of Cardiovascular Diseases, Department of Cardiac Rehabilitation, Bankya, Sofia, Bulgaria.
Clinical Hemorheology and Microcirculation
|May 27, 2008
Summary
Aging rat aortas exhibit worsened viscoelastic characteristics (VEC), showing increased stiffness and friction. These changes in blood vessel biomechanics with age and pressure endanger arterial wall integrity.
Area of Science:
- Biomedical Engineering
- Cardiovascular Physiology
- Biophysics
Background:
- Arterial viscoelastic characteristics (VEC) are crucial for cardiovascular health.
- Aging is associated with changes in arterial biomechanical properties.
Purpose of the Study:
- To investigate the age-related changes in viscoelastic characteristics of rat aorta.
- To determine the influence of intraluminal pressure on aortic VEC in aged rats.
Main Methods:
- Sinusoidal excitation of intraluminal pressure in isolated rat aortic preparations.
- Frequency sweep analysis (3-30 Hz) to record volume oscillations and resonance curves.
- Estimation of natural frequency (f(0)), dynamic modulus of elasticity (E'), and coefficient of viscosity (beta).
Main Results:
- Natural frequency (f(0)) decreased linearly with intraluminal pressure in old rat aorta, unlike young aorta.
- Dynamic modulus of elasticity (E') and coefficient of viscosity (beta) increased nonlinearly and linearly with pressure, respectively, in old aorta.
- Viscoelastic characteristics were higher at decreasing excitation frequency, indicating frequency and pressure-dependent behavior.
Conclusions:
- Viscoelastic characteristics of rat aorta significantly worsen with age, characterized by increased stiffness and friction.
- Elevated intraluminal pressure exacerbates these age-related changes, potentially compromising arterial wall integrity.
- Arterial wall biomechanical behavior is influenced by age, pressure, and excitation frequency direction.
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