<Originals>A Biomechanical Model of Single-joint Arm Movement Control Based on the Equilibrium Point Hypothesis
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概要
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SUZUKI, M., YAMAZAKI, Y. and TANIGUCHI, Y., A Biomechanical Model of Single-joint Arm Movement Control Based on the Equilbrium Point Hypothesis. Abv. Exerc. Sports Physiol., Vol.9, No.1 pp.7-25, 2004. According to the equilibrium point hypothesis of motor control, control action of muscles is not explocoty computed, but rather arises as a consequence of interaction among moving equilibrium point, reflex feedback and muscle mechanical properties. This approach is attractive as it obviates the need to explicitly specify the forces cintrolling limb movements. One of the debatable aspects in the original version of this hypothesis is the command waveform specifying the moving equilibrium point, in particular, in replicating various speeds of movements and movements performed in differet ecvironments. In this study, we intended to extend the original single-joint modei under the empirically suggested assumption that the control system may have a program to compute and combine a pulse and a step motor command, as seen in oculomotor physiology. We hypothesized that the pulse command shares the common scaling factors (i. e., pulse height and pulse width) with scaling of the step command and coactivation command. These commands are translated into control inputs to antagonist muscles by a spinal neural networl, with the reciprocal reflex circuit playing an important role in this transformation. At the putput stage, stretch reflex feedback acts to effecticely elicit a convergent torque towards the joint equilibrium such that reflex activation sums up agonist coactivation shile concomitantly inhibiting coactivation of the opposing muscle. This model could well account for the single-joint elbow movements performed over a wide range of movement times and distances. Our proposal of a synthesis of the equilibrium point approach and pulse step motor command theory, may pffer some insights into the control scheme which might be shared in the skeletomotor and oculomotor systems.
- 日本運動生理学会の論文
著者
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SUZUKI Masataka
Department of Biological Production, Faculty of Agriculture, Tokyo University of Agriculture and Tec
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Yamazaki Yoshihiko
Department Of Health And Physical Education Nagoya Institute Of Technology
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Yamazaki Yoshihiko
Department Of Cardiovascular Surgery Nagaoka Red Cross Hospital
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TANIGUCHI Yumiko
College of Human Life and Environment, Kinjo Gakuin University
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Suzuki Masataka
Department Of Psychology Kinjo Gakuin University
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Taniguchi Yumiko
College Of Human Life And Environment Kinjo Gakuin University
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Suzuki Masataka
Department Of Anatomy Showa University School Of Medicine
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