title: Force-velocity characteristics of stomach muscle: a comparison between longitudinal and circular muscle strips.
abstract: The longitudinal and circular muscle preparations from guinea pig stomach were compared in their property of shortening. The highest shortening speed was attained only for about 1 sec for longitudinal muscle and about 2 sec for circular muscle from the onset of stimulation in the course of tetanic contraction. Dynamic constants calculated from a force-velocity curve were almost independent of the muscle length, being set near its optimum length. Mean dynamic constants of the longitudinal muscle were: Vmax: 0.205 L/sec, b: 0.056 L/sec, a/Po: 0.292 and that of the circular muscle were: Vmax: 0.576 L/sec, b: 0.056 L/sec, a/Po: 0.107. The difference in Vmax of these muscles are discussed along with the difference in ultrastructure of the contractile filaments.
authors.forename: M
authors.initials: M
authors.lastname: Moriya
authors.forename: E
authors.initials: E
authors.lastname: Miyazaki
mesh_terms: D000818:Animals; D006168:Guinea Pigs; D007537:Isometric Contraction; D007700:Kinetics; D008297:Male; D009119:Muscle Contraction; D009130:Muscle, Smooth / Q000502:physiology*; D009928:Organ Specificity; D013270:Stomach / Q000502:physiology*