Mathematical models for 1) musculoskeletal dynamics, and 2) reflex feedback, based on the results of the authors’ frequeny-response measurements on normal adult male human subjects, are combined to produce a model for physiological tremor in such subjects. An analysis of this model shows that the system will be unstable to small disturbances (that is, tremor will occur) under certain conditions of external loading. Further, when the system is unstable, nonlinearities in the model produce responses in the form of limit cycles, and both the frequency and amplitude of the resulting tremor can be calculated. For constant loads applied through a constant compliance, the model predicts the onset of tremor at low loads, a maximum intensity of tremor at loads corresponding to 30–50 percent of maximum voluntary effort, and a decrease in the tremor amplitude at still higher loads.
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August 1983
Research Papers
Predictions of the Existence, Frequency, and Amplitude of Physiological Tremor in Normal Man Based on Measured Frequency-Response Characteristics
G. I. Zahalak,
G. I. Zahalak
Department of Mechanical Engineering, Washington University, St. Louis, Mo. 63130
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S. C. Cannon
S. C. Cannon
Department of Biomedical Engineering, School of Medicine, The Johns Hopkins University, Baltimore, Md. 21205
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G. I. Zahalak
Department of Mechanical Engineering, Washington University, St. Louis, Mo. 63130
S. C. Cannon
Department of Biomedical Engineering, School of Medicine, The Johns Hopkins University, Baltimore, Md. 21205
J Biomech Eng. Aug 1983, 105(3): 249-257 (9 pages)
Published Online: August 1, 1983
Article history
Received:
October 19, 1982
Revised:
February 18, 1983
Online:
June 15, 2009
Citation
Zahalak, G. I., and Cannon, S. C. (August 1, 1983). "Predictions of the Existence, Frequency, and Amplitude of Physiological Tremor in Normal Man Based on Measured Frequency-Response Characteristics." ASME. J Biomech Eng. August 1983; 105(3): 249–257. https://doi.org/10.1115/1.3138413
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