Force-Velocity and Series Elastic Characteristics of Smooth Muscle from the Hog Carotid Artery

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Abstract
The force-velocity and series elastic characteristics of vascular strips from the media of hog carotid arteries were determined using the method of quick release to a known afterload. Shortening velocity was a function of load, and the data could be fitted by a rectangular hyperbola using the Hill equation, (P + a) V = b (P o - P), where P is the load, P o is the maximum isometric force developed at the optimum muscle length (L o ), V is velocity, and a and b are constants. The following dynamic constants were obtained for the electrically stimulated strips: estimated maximum shortening velocity for the unloaded muscle (V max ) = 0.12 L o /sec, b = 0.02 L o /sec, P o = 1.80 kg-wt/cm 2 = 1.76 x 10 6 dynes/cm 2 , and a/P o = 0.18. Maximum power output occurred at a load of 0.28 P o . The stress-strain curve for the series elastic component could be approximated by the simple exponential equation, stress = 0.034e 058 strain . The extension of the series elastic component at P o was 7.2% of L o .

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