Key result
Ramp-and-hold stress tests on embryonic chick ventricles show linear relaxation independent of stretch level or stage.
Why the study?
The mechanical properties of embryonic cardiac tissue, linking form and function, are largely unknown.
Comparison
Ramp-and-hold stress relaxation tests at 10%, 20%, and 40% stretch
Design
Experimental study using quasi-linear viscoelastic representation
Authors
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Chick embryo data indicate stable viscoelastic properties across early stages; leaves open translation to mammalian hearts or congenital disease models.
The viscoelastic properties of stage-16 and stage-18 chick embryonic ventricles are similar to adult tissue and do not significantly differ between these early developmental stages or stretch levels.
Miller et al. (1997) studied embryonic cardiac tissue. ramp-and-hold stress relaxation tests was evaluated on viscoelastic behavior (reduced relaxation functions). Ramp-and-hold stress relaxation tests on embryonic chick ventricles demonstrated highly linear relaxation functions with natural log time, with no significant differences between stretch levels or stages.
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