Key result
The quick-release phenomenon in cat papillary muscles is not solely due to the sudden recoil of a series elastic component, indicating that nonseries elasticity contributes to the phenomenon.
Population
Cat papillary muscles perfused with oxygenated physiologic saline at 26°C and contracting isometrically at…
Comparison
Shortening steps imposed 330 msec, 170 msec, or… vs Predicted results based on the assumption that…
Design
Preclinical
Authors
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Does not inform clinical care; challenges Hill model applicability in cardiac muscle mechanics research.
The study demonstrates that nonseries elasticity contributes to the quick-release phenomenon in cat myocardium, challenging the applicability of the simple Hill model for isometric contraction in heart muscle.
Noble et al. (1972) studied this question. Shortening steps imposed at different times after stimulation vs. Predicted results assuming sudden drop in force was due to recoil of a series elastic component (SEC) alone was evaluated on Force immediately following the shortening step. The quick-release phenomenon in cat papillary muscles is not solely due to the sudden recoil of a series elastic component, indicating that nonseries elasticity contributes to the phenomenon.
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