Key result
Cardiac muscle shortening against a time-varying Windkessel load produced greater force, work output, and mechanical efficiency compared to conventional constant-force shortening.
Slower shortening kinetics against a time-varying load enhances the mechanical efficiency of cardiac muscle during work-loop contractions.
May improve modeled cardiac efficiency under dynamic loads; leaves open validation in intact hearts and clinical translation.
Cardiac muscle samples were allowed to describe their natural shortening dynamics while performing force-length work and liberating heat. The muscle shortened more slowly and produced greater force and work output against a time-varying "Windkessel" load than during conventional constant-force shortening, thereby yielding greater mechanical efficiency. A key finding is that the slower shortening kinetics developed in the face of a time-varying load enhances the mechanical efficiency of cardiac muscle during work-loop contractions.
No takes yet. Share an insight, caveat, or question.
Garrett et al. (2022) studied this question. Time-varying "Windkessel" load vs. Conventional constant-force shortening was evaluated on Mechanical efficiency. Cardiac muscle shortening against a time-varying Windkessel load produced greater force, work output, and mechanical efficiency compared to conventional constant-force shortening.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: