What question did this study set out to answer?

Characterize the real-time kinetics and load dependence of sarcomere relaxation in intact cardiac muscle.

March 1, 1985Circulation ResearchOpen Access

Real-time kinetics of sarcomere relaxation by laser diffraction.

View Full Paper

Ask AI

Bookmark

Characterize the real-time kinetics and load dependence of sarcomere relaxation in intact cardiac muscle.
Measured instantaneous sarcomere shortening, muscle shortening, and tension simultaneously during afterloaded twitches in excised rat right ventricular trabeculae using laser diffraction.
Sarcomere shortening amplitude reached 0.30 ± 0.01 µm with preload only compared to 0.16 ± 0.01 µm in isometric twitches from a baseline resting length of 2.20 ± 0.02 µm.
Maximum sarcomere relaxation velocity decreased exponentially as isotonic load increased: max Vr = -4 exp(-2.5 × 10⁻² % TF) (r = 0.95).
Sarcomere relaxation followed two exponential phases, where the rapid phase predominated at low loads and the slower phase predominated at high loads (% TF = 0.2 tau 1 + 4.8, r = 0.83; % TF = -0.1 tau 2 + 157, r = 0.95).

Discussion

No takes yet. Share an insight, caveat, or question.

Implication

Biophysical study reveals load-dependent biphasic sarcomere relaxation in rat ventricular trabeculae, indicating mechanical load regulates myocardial relaxation kinetics.

Cite This Study

Lecarpentier et al. (1985) studied this question.

synapsesocial.com/papers/6a779f60f6749a0058ec69ac https://doi.org/10.1161/01.res.56.3.331

View Full Paper

Ask AI

Bookmark

Implication

Biophysical study reveals load-dependent biphasic sarcomere relaxation in rat ventricular trabeculae, indicating mechanical load regulates myocardial relaxation kinetics.

Real-time kinetics of sarcomere relaxation by laser diffraction.

Key Points

Discussion

Implication

Cite This Study

Real-time kinetics of sarcomere relaxation by laser diffraction.

Key Points

Discussion

Implication

Cite This Study

Also Consider

Also Consider