Journal of Applied Physiology AJP: Renal Physiology
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J Appl Physiol 64: 2053-2057, 1988;
8750-7587/88 $5.00
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Journal of Applied Physiology, Vol 64, Issue 5 2053-2057, Copyright © 1988 by American Physiological Society

ARTICLES

Velocity-length-time relations in canine tracheal smooth muscle

C. Y. Seow and N. L. Stephens
Department of Physiology, Faculty of Medicine, University of Manitoba, Winnipeg, Canada.

Zero-load velocity (V0) as a function of the length of canine tracheal smooth muscle was obtained by applying zero-load clamps to isotonically contracting muscle under various loads. The load clamps were applied at a specific time after onset of contraction. The magnitude of the isotonic load therefore determines the length of the muscle at the moment of release or at the moment the unloaded shortening velocity was measured. A family of such V0-muscle length (L) curves was obtained at 1-s intervals in the time course of contraction. The V0-L curve was fitted by a parabolic function with satisfactory goodness of fit. The maximum shortening velocity at optimum muscle length varied with time, but the minimum length at which V0 diminished to zero was time independent.


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