title: The dependence on the distance of shortening of the energy output from frog skeletal muscle shortening at velocities of Vmax, 1/2Vmax and 1/4Vmax.
abstract: Shortening heat and work were measured, during and after the shortening, in contractions in which muscles shortened various distances (all ending at 2.05 micron of sarcomere length) at various velocities. Shortening heat and work were produced as a non-linear function of the distance shortened at velocities greater than 1/ 2Vmax , which was probably caused by a redistribution of the crossbridge population to different state(s) during the approach to the steady state.
mesh_terms: D000818:Animals; D004734:Energy Metabolism; D066298:In Vitro Techniques; D007700:Kinetics; D009119:Muscle Contraction; D009132:Muscles / Q000502:physiology*; D009210:Myofibrils / Q000502:physiology*; D011894:Rana pipiens; D012518:Sarcomeres / Q000502:physiology* / Q000648:ultrastructure; D013816:Thermodynamics