Force-velocity relationship of cat cardiac muscle, studied by isotonic and quick-release techniques.
نویسندگان
چکیده
منابع مشابه
Series Elasticity in Heart Muscle
The series elasticity (SE) of cat papillary muscle was measured in 6 muscles by the isotonic quick-release method, with careful correction for the compliance of the equipment. The resultant SE curve was exponential in form with an extension of 4% to 5% of initial muscle length for a preload of 0.5 g and a developed tension of 10 g; this demonstrates a stiffer SE for cardiac muscle than has prev...
متن کاملSeries elasticity in heart muscle. Its relation to contractile element velocity and proposed muscle models.
The series elasticity (SE) of cat papillary muscle was measured in 6 muscles by the isotonic quick-release method, with careful correction for the compliance of the equipment. The resultant SE curve was exponential in form with an extension of 4% to 5% of initial muscle length for a preload of 0.5 g and a developed tension of 10 g; this demonstrates a stiffer SE for cardiac muscle than has prev...
متن کاملA Model of Cardiac Muscle Dynamics
A mathematical model is presented describing the timeand length-dependent behavior of cardiac muscle. The model describes a wider variety of experimental data than do previously published models. It incorporates a modification of the Hill equation describing the force-velocity relation. Based on the sliding filament theory, the revised equation includes the effects of finite cross-bridge compli...
متن کاملForce-velocity-length-time relations of the contractile elements in heart muscle of the cat.
The instantaneous force-velocity-length relations of the contractile elements of the cat papillary muscle have been obtained by determining the phase-plane trajectories of velocity of shortening relative to length during isotonic contractions and correcting these measurements for the series elastic extension during the isometric phase of contraction. The load-extension curve of the series elast...
متن کاملEffect of muscle length on the force-velocity relationship of tetanized cardiac muscle.
Cat papillary muscles were tetanized with repetitive electrical stimulation in the presence of 10 ITIM caffeine and 10 mM calcium. Velocities were measured during the plateau of tetanus with quick releases to isotonic loads. The course of isotonic shortening was independent of time in the contraction cycle for at least 2 seconds after the attainment of peak isometric force. The force-velocity r...
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عنوان ژورنال:
- Circulation research
دوره 24 6 شماره
صفحات -
تاریخ انتشار 1969