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

To determine the mechanical properties of the multi‐innervated fibers in inferior oblique muscle of the cat, these fibers were selectively activated by means of an intravenous 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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