Modifications of neural output signals by muscles: a frequency response study

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Abstract
Computer-generated stimulus patterns were used to study the response of cat skeletal muscle to nerve signals of changing impulse rates. Isometric tension responses were recorded. This method of testing demonstrated that muscle introduces alterations into dynamic nerve signals which are not obvious when tested with only a single pulse or even with uniform tetanic trains of stimuli. Within the range of physiological response characteristics, muscle introduces large lags in the response. The importance of such lags in the stretch reflex and other feedback systems is emphasized. Muscle also shows less isometric response amplitude for rapid cyclic inputs than for inputs of nerve impulses which change slowly in rate. Graphs are presented which illustrate the differences in amplitude and lag effects introduced by muscle when dealing with pulse rate signals varying at different cyclic frequencies. feedback analysis; pulse rate modulation; lag; reflex; isometric response; muscle dynamics; movement Submitted on January 9, 1964

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