In order to assess the significance of the dynamics of neural control signals for the rise time of muscle moment, simulations of isometric and dynamic plantar flexion contractions were performed using electromyographic signals (EMG signals) of m. triceps surae as input. When excitation dynamics of the muscle model was optimized for an M-wave of the medial head of m. gastrocnemius (GM), the model was able to make reasonable predictions of the rise time of muscle moment during voluntary isometric plantar flexion contractions on the basis of voluntary GM EMG signals. The rise time of muscle moment in the model was for the greater part determined by the amplitude of the first EMG burst. For dynamic jumplike movements of the ankle joint, however, no relationship between rise time of muscle moment in the experiment and muscle moment predicted by the model on the basis of GM EMG signals was found. Since rise time of muscle moment varied over a small range for this movement, it cannot be completely excluded that stimulation dynamics plays a role in control of these simple single-joint movements. [S0148-0731(00)01104-3]
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August 2000
Technical Papers
Predictions of Mechanical Output of the Human M. Triceps Surae on the Basis of Electromyographic Signals: The Role of Stimulation Dynamics
J. P. van Zandwijk,
e-mail: zandwijk@xs4all.nl
J. P. van Zandwijk
Institute for Fundamental and Clinical Human Movement Sciences, Vrije Universiteit, Amsterdam, The Netherlands
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M. F. Bobbert,
e-mail: m_f_bobbert@fbw.vu.nl
M. F. Bobbert
Institute for Fundamental and Clinical Human Movement Sciences, Vrije Universiteit, Amsterdam, The Netherlands
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J. Harlaar
J. Harlaar
Department of Rehabilitation Medicine, Free University Hospital, Amsterdam, The Netherlands
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J. P. van Zandwijk
Institute for Fundamental and Clinical Human Movement Sciences, Vrije Universiteit, Amsterdam, The Netherlands
e-mail: zandwijk@xs4all.nl
M. F. Bobbert
Institute for Fundamental and Clinical Human Movement Sciences, Vrije Universiteit, Amsterdam, The Netherlands
e-mail: m_f_bobbert@fbw.vu.nl
J. Harlaar
Department of Rehabilitation Medicine, Free University Hospital, Amsterdam, The Netherlands
Contributed by the Bioengineering Division for publication in the JOURNAL OF BIOMECHANICAL ENGINEERING. Manuscript received by the Bioengineering Division Dec. 9, 1998; revised manuscript received March 9, 2000. Associate Technical Editor: L. J. Soslowsky.
J Biomech Eng. Aug 2000, 122(4): 380-386 (7 pages)
Published Online: March 9, 2000
Article history
Received:
December 9, 1998
Revised:
March 9, 2000
Citation
van Zandwijk, J. P., Bobbert, M. F., and Harlaar, J. (March 9, 2000). "Predictions of Mechanical Output of the Human M. Triceps Surae on the Basis of Electromyographic Signals: The Role of Stimulation Dynamics ." ASME. J Biomech Eng. August 2000; 122(4): 380–386. https://doi.org/10.1115/1.1286562
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