Frequency-response characteristics of the tonic stretch reflexes of biceps brachii muscle in intact man |
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| Authors: | P. D. Neilson |
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| Affiliation: | (1) Division of Neurology, Prince Henry Hospital, University of New South Wales, Sydney, Australia;(2) Schools of Medicine & Physics, University of New South Wales, Sydney, Australia;(3) Present address: Centre Industries Research Scholar, University of New South Wales, Sydney, Australia |
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| Abstract: | Transmission characteristics of tonic stretch reflex pathways in intact man have been measured by applying disturbance torques about the elbow and recording the integrated electromyogram (i.e.m.g.) responses of biceps brachii. Crosscorrelation analysis enabled extraction from the total e.m.g. activity of i.e.m.g. fluctuations which were correlated with elbow-angle changes. The i.e.m.g. reflex responses were free of harmonic distortion and so were linearly related to the small-signal sinusoidal stretching movements. Transfer characteristics were found to be more complex than those described for anaesthetised or decerebrate cats. The frequency-response curves contained a number of peaks of resonance, and phase lead advanced from 100° to 180° as the frequency of sinusoidal stretching increased towards 5 Hz. |
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