A Proposal for a Model of Change of Maximum Isometric Muscle Force in Step-Change Workload
Shota Ando*, Takayuki Tanaka*, Hiroyuki Nara*,
and Kazuki Takizawa**
*Graduate School of Information Science and Technology, Hokkaido University, Kita 14, Nishi 9, Kita-ku, Sapporo, Hokkaido 060-0814, Japan
**High Education Promotion Agency High Education Research Section, Hokkaido University, Kita 17, Nishi 8, Kita-ku, Sapporo, Hokkaido 060-0816, Japan
In this study, we modeled the change in maximum muscle force when a skeletal muscle is subjected to a periodic workload. The model represents an increase or decrease in the maximum muscle force exerted. It was created to evaluate the effects of our power-assist technologies on skeletal muscle strength, and we think that it can be applied to sports science. The model equation is constituted by a formula of step responses of a first-order delay system. The model input has the following four constants: the target muscle impulse when exerting force during a day in daily life, the force impulse exerted in 1 day during a period in which the target muscle was under study, the target musclemaximal strength, and the subject-specific time constant that represents the ease of change in muscle force. The output is the change in maximal strength. We confirmed the validity of the model by fitting the model to measurements obtained from experimental subjects. For this, we applied a special filter to remove noise from muscle force measurements.
and Kazuki Takizawa, “A Proposal for a Model of Change of Maximum Isometric Muscle Force in Step-Change Workload,” J. Robot. Mechatron., Vol.25, No.6, pp. 1050-1059, 2013.
-  Y. Imamura et al., “Motion-Based-Design of Elastic Material for Passive Assistive Device using Musculoskeletal Model,” J. of Robotics and Mechatronics, Vol.23, No.6, pp. 978-990, 2011.
-  T. Kusaka et al., “Assist Force Control of Smart Suit for Horse Trainer Considering Motion Synchronization,” Int. J. of Automation Technology, Vol.3, No.6, pp. 723-730, 2009.
-  H. Nara et al., “Fundamental study on evaluation of KEIROKA (fatigue-reduction) technology in using UD shovel for removing snow by Musculo-Skeletal Dynamics Simulator,” IEEE Int. Conf. on Robotics and Biomimetics 2011, pp. 1579-1584, 2011.
-  N. Ishii, “Resistance Training,” Book House HD, Nov. 1999 (in Japanese).
-  A. Rosendo et al., “A Yank-Based Variable Coefficient Method for a Low-Powered Semi-Active Power Assist System,” J. of Robotics and Mechatronics, Vol.24, No.2, pp. 291-297, 2012.
-  V. M. Zatsiorsky et al., “Science and Practice of Strength Training,” Human Kinetics, 2006.
-  J. Z. Liu et al., “A dynamical model of muscle activation, fatigue, and recovery,” Biophysical J., Vol.82, No.5, pp. 2344-2359, May 2002.
-  T. Moritani et al., “Sports Physiology,” Asakura Publishing, Apr. 1994 (in Japanese).
-  K. Ohtani et al., “Intraindividual Variation in Maximal Isometric Strength,” Graduate School of law, Shimane University (proceedings), Vol.24, No.2, pp. 1-4, 1990 (in Japanese).
-  T. Kizuka et al., “Practical Usage of Surface Electromyogram,” Tokyo Denki University Press, Mar. 2006 (in Japanese).
Copyright© 2013 by Fuji Technology Press Ltd. and Japan Society of Mechanical Engineers. All right reserved.