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Abstract
This study aimed to determine the effect of muscle co-contraction on balance recovery by using a simulation model. The muscle-driven forward simulation model included an inverted pendulum with two ankle muscles, a plantar flexor muscle (PF), and a dorsal flexor muscle (DF). The model was created based on experimental data obtained from balance recovery after applying backward platform translation to a standing elderly woman. Baseline simulation was performed using this model. Additionally, we performed two simulations with increased DF excitation at the same level of simulation and at the same pattern of simulation. The same level of simulation had the same PF excitation level as the baseline simulation with increased DF excitation. The same pattern simulation had the same increased or decreased PF excitation pattern but with a constant increase in PF excitation level to offset the increased DF excitation. Our results revealed that the same pattern simulation decreased the maximum dorsal flexion angle after platform translation. During the same level of simulation, the insufficient PF force used to recover balance resulted in a forward fall. These results imply that co-contraction is an effective strategy for recovering balance at the expense of additional muscle excitation in the elderly.
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Affiliation(s)
- S. OGAYA
- Division of Physical Therapy, Department of Comprehensive Rehabilitation, Osaka Prefecture University 3-7-30, Habikino, Habikino-shi Osaka, 583-8555, Japan
| | - K. NAGAI
- Department of Physiotherapy, School of Rehabilitation, Hyogo University of Health Sciences 1-3-6, Minatojima, Chuo-ku, Kobe-shi Hyogo, 650-8530, Japan
| | - Y. OKITA
- Human Health Sciences, Graduate School of Medicine, Kyoto University, Kyoto, 606-8507, Japan 53, Kawahara Shogoin, Sakyo-ku, Kyoto, 606-8507, Japan
| | - S. FUCHIOKA
- Division of Physical Therapy, Department of Comprehensive Rehabilitation, Osaka Prefecture University 3-7-30, Habikino, Habikino-shi Osaka, 583-8555, Japan
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OGAYA S, NAITO H, OKITA Y, IWATA A, HIGUCHI Y, FUCHIOKA S, TANAKA M. CONTRIBUTION OF MUSCLE TENSION FORCE TO MEDIAL KNEE CONTACT FORCE AT FAST WALKING SPEED. J MECH MED BIOL 2015. [DOI: 10.1142/s0219519415500025] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Fast walking is considered as a factor that causes pain in patients suffering from knee disorders. This study examined the effect of walking speed on the medial knee contact force and identified contributions to the muscle tension on the medial knee contact force during fast walking using musculoskeletal simulation analysis. The muscle contribution to the medial knee contact force was calculated based on the joint angles and ground reaction force for the normal and fast walking experiments of seven subjects. The muscle force and joint reaction force were used to estimate the medial knee contact force. Results showed, in average, 70% increase in medial knee contact force at the first peak and 34% increase at the second peak with a fast walking speed, compared to when they walked at a normal walking speed. The remarkable increase in the first peak was mainly contributed by the increase in the quadriceps force resisting the external knee flexion moment. In contrast, the moderate increase of second peak was contributed by the increase in the gastrocnemius muscle force. These results suggest that the increase in medial knee contact force at fast walking speeds is caused by the increased muscle force.
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Affiliation(s)
- S. OGAYA
- Division of Physical Therapy, Department of Comprehensive Rehabilitation, Osaka Prefecture University, Osaka 583-8555, Japan
- Division of Bioengineering, Department of Mechanical Science and Bioengineering, Graduate School of Engineering Science, Osaka University, Osaka 560-8531, Japan
| | - H. NAITO
- Division of Bioengineering, Department of Mechanical Science and Bioengineering, Graduate School of Engineering Science, Osaka University, Osaka 560-8531, Japan
| | - Y. OKITA
- Human Health Sciences, Graduate School of Medicine, Kyoto University, Kyoto 606-8507, Japan
| | - A. IWATA
- Division of Physical Therapy, Department of Comprehensive Rehabilitation, Osaka Prefecture University, Osaka 583-8555, Japan
| | - Y. HIGUCHI
- Division of Physical Therapy, Department of Comprehensive Rehabilitation, Osaka Prefecture University, Osaka 583-8555, Japan
| | - S. FUCHIOKA
- Division of Physical Therapy, Department of Comprehensive Rehabilitation, Osaka Prefecture University, Osaka 583-8555, Japan
| | - M. TANAKA
- Division of Bioengineering, Department of Mechanical Science and Bioengineering, Graduate School of Engineering Science, Osaka University, Osaka 560-8531, Japan
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LAZAREVIC A, NAKATANI S, OKITA Y, TAKEDA Y, HIROOKA K, YAMAGISHI M, KITAMURA S, MIYATAKE K. 216 Echocardiographic evaluation of left ventricular function in the marfan syndrome: Relation to the progression of aortic dilatation. European Journal of Echocardiography 1999. [DOI: 10.1016/s1525-2167(99)80144-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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LAZAREVIC A, NAKATANI S, OKITA Y, TAKEDA Y, HIROOKA K, YAMAGISHI M, KITAMURA S, MIYATAKE K. 216 Echocardiographic evaluation of left ventricular function in the marfan syndrome: Relation to the progression of aortic dilatation. European Journal of Echocardiography 1999. [DOI: 10.1016/s1525-2167(99)80051-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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KAWASHIMA M, OKITA Y, OHMURA E. Sialic acid-like substance in horse serum. J Biochem 1962; 52:381-2. [PMID: 14031543 DOI: 10.1093/oxfordjournals.jbchem.a127633] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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