MECHANICAL PROPERTIES OF SUCCINYLCHOLINE ACTIVATED MUSCLE FIBERS IN THE INFERIOR OBLIQUE MUSCLE OF THE CAT

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Abstract
To determine the mechanical properties of the multi-innervated fibers in inferior oblique muscle of the cat, these fibers were selectively activated by an i.v. injection of succinylcholine chloride (Sch). For small sinusoidal length changes (.+-. 1 mm) of low frequency, tension in the Sch activated muscle exhibited a component that was sensitive to the direction of stretch but was independent of the velocity. At higher frequencies of length change (16 Hz), a form of negative friction was observed. Negative friction had not been previously noted in mammalian muscles, although a similar friction was observed both in the muscles of insects and amphibians. These properties were expressed in the form of a simple mechanical model.

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