Effects of Controlling the Velocity of Shortening on Force-Velocity-Length and Time Relations in Cat Papillary Muscle: VELOCITY CLAMPING

Effects of controlling the velocity of shortening on force-velocity-length and time relations in cat papillary muscle. Velocity clamping.

Force-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...

Effect of calcium on force-velocity-length relations of heart muscle of the cat.

The influence of calcium concentration in the bathing solution on the force-velocity relations of the isolated, electrically excited cat papillary muscle was examined. Shortening velocity was directly measured at minimum loads by unloading or load clamping the muscle from the preload (at the length, Lmax, where maximum active tension was developed) to 0 (zero-load clamp), 2, 5, 10, and 15% of t...

Optimal shortening velocity (V/Vmax) of skeletal muscle during cyclical contractions: length-force effects and velocity-dependent activation and deactivation.

The force-velocity relationship has frequently been used to predict the shortening velocity that muscles should use to generate maximal net power output. Such predictions ignore other well-characterized intrinsic properties of the muscle, such as the length-force relationship and the kinetics of activation and deactivation (relaxation). We examined the effects of relative shortening velocity on...

Force-velocity relations in mammalian heart muscle.

SONNENBLICK, EDMUND H. Force-velocity relations in mammalian heart muscle. Am. J. Physiol. 202 (5) : 931-939. 1962.Force-velocity relations were studied in the cat papillary muscle. As with skeletal muscle, a characteristic relation has been demonstrated between the velocity of shortening (V) and the force developed (PO). Two generalities have been shown to pertain. First, increasing initial mu...