Curriculum Vitaes
Profile Information
- Affiliation
- Professor, Faculty of Regional Policy, Aichi University
- Degree
- (BLANK)(BLANK)
- J-GLOBAL ID
- 200901051223395432
- researchmap Member ID
- 1000194290
Research Interests
6Research Areas
1Education
4Papers
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The 2018 Conference of the International Sports Engineering Association. Proceedings 2018, 2, 302., 2(6), Feb, 2018 Peer-reviewed
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SHD, 2017 D-20, 2017<p>Shock attenuation property of sports surfaces is especially important not only for the athlete's performance but also for injury prevention. To evaluate the properties of the sports surfaces, some sports governing bodies often adopt friction tests and shock attenuation tests to determine the horizontal and vertical characteristics, respectively. Although the diagonal impacts are often observed in athletic sports, shock attenuation test treats only the vertical impact test. Therefore, we developed a two-dimensional impact test device for examining the two-dimensional cushioning characteristics of sports surfaces in previous studies. To produce a simultaneous two-dimensional force against a test specimen, we incorporated a parallelogram linkage in the measuring system. The weight is dropped onto the upper side of the parallelogram linkage with various height and various initial angles. Initial angle controls the ratio of vertical/horizontal impact forces. In previous studies, FR (Force Reduction) values are calculated from experimental un-cushioned and cushioned forces for evaluating the shock attenuation properties. Additionally, to evaluate the maximum deformation during the impact, a biaxial accelerometer is attached to the sensor unit. Although FR values are simple and easy to calculate from the experimental data, it needs a vast cost because there are huge number of combinations of impact angles, magnitude of impacts and impact durations if the tests should be covered for various human activities. Therefore, in previous studies, we proposed the vertical viscoelastic model which can represent the behavior of sports surfaces during the impact for evaluating the shock attenuation properties. In this study, we propose the two-dimensional viscoelastic model of sport surfaces for evaluating the two-dimensional cushioning properties. Finally, proposed model can be used for estimating the impact forces from the experimental data.</p>
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DD, 2017, 2017Shock attenuation property of sports surfaces is especially important not only for the athlete&rsquo;s performance but also for injury prevention. To evaluate the properties of the sports surfaces, some sports governing bodies often adopt friction tests and shock attenuation tests to determine the horizontal and vertical characteristics, respectively. Although the diagonal impacts are often observed in athletic sports, shock attenuation test only treats the vertical impact test. Therefore we developed a two-dimensional impact test device for examining the two-dimensional cushioning characteristics of sports surfaces in this studies. To produce a simultaneous two-dimensional force against a test specimen, we incorporated a parallelogram linkage in the measuring system. The impact force generated was measured by the load cell. And an accelerometer was attached and the acceleration was also calculated. And experiments were performed to three kinds of different samples. In order to confirm the characteristics of the surface, the relationship between vertical and horizontal maximum force and displacement was confirmed. As the results, Hysteresis property in the vertical direction was found to depend on the hardness of the sports surfaces. However, it was found that the property in the horizontal direction is more complex than the vertical direction.
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SHD, 2016 B-35, 2016<p>Shock attenuation property of sports surfaces is especially important not only for the athlete's performance but also for injury prevention. To evaluate the properties of the sports surfaces, some sports governing bodies often adopt friction tests and shock attenuation tests to determine the horizontal and vertical characteristics, respectively. Although the diagonal impacts are often observed in athletic sports, shock attenuation test only treats the vertical impact test. Therefore we developed a two-dimensional impact test device for examining the two-dimensional cushioning characteristics of sports surfaces in previous studies. To produce a simultaneous two-dimensional force against a test specimen, we incorporated a parallelogram linkage in the measuring system. In previous study, it was examined for hysteresis for three types of hardness samples. In this study, we improved the two dimensional impact test device and experiments were performed to three kinds of different samples. To evaluate the hysteresis properties of sports surfaces, the energy loss of each impact was calculated. As the results, Hysteresis property in the vertical direction was found to depend on the hardness of the sports surfaces. However, it was found that the hysteresis property in the horizontal direction is more complex than the vertical direction.</p>
Misc.
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地域政策学ジャーナル = Aichi University journal of regional policy studies, 7(2) 81-95, Mar, 2018
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SHD, 2017 A-16, 2017<p>In this study, we evaluated the running motion and the physical characteristics of body under the various floor condition. We measured, firstly, the running motion under three floor conditions, i.e., the rigid floor, one mat on the floor and two mats on the floor. From the measurement results, it was confirmed that the running motion did not change significantly due to the change of floor condition. Next, we simulated the running motion based on the multi-degree-of-freedom model whose parameters were identified such as to agree with the measured running motion. As the simulation results, it was shown that the rigidity of the hip joint became bigger in the case of running on one mat or two mats compared with the case of rigid floor.</p>
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SHD, 2017 C-34, 2017<p>In this study, an inverse dynamics analysis method considering swing leg motion was constructed only by using some wireless motion sensors.(WMS) First, it was confirmed that the acceleration data by the WMS agreed well with the one by the 3-dimensional motion analysis system. Then, the method to separate the hip joint reaction force obtained from the equation of motion of the body into the support leg and the swing leg and to identify the ground reaction force was constructed, i.e., the top down approach considering swing leg motion. For the actual running data, the ground reaction force was identified, and it was concluded that the result agreed well with the one by using the force plate. The method constructed in this study, therefore, is concluded to be applicable for the actual application.</p>
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SHD, 2016 A-15, 2016<p>In this study, an inverse dynamics analysis method was constructed only by using some wireless motion sensors.(WMS) First, it was confirmed that the acceleration data by the WMS agreed well with the one by the 3-dimensional motion analysis system. Then, the method to estimate the contact period between the foot and ground was constructed by using the vertical acceleration data of the body. Moreover, the method to identify the ground reaction force was constructed, i.e., the top down approach. For the actual running data, the ground reaction force was identified, and it was concluded that the result agreed well with the one by using the force plate. The method constructed in this study, therefore, is concluded to be applicable for the actual application.</p>
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The Proceedings of Mechanical Engineering Congress, Japan, 2015 _J2310101--_J2310101-, 2015The purpose of this study is to investigate the shock attenuation properties of long pile synthetic turf by modeling and simulation. Three types of sepecimens which have different hardness were used for comparing the shock attenuation properties. The hardness was controlled by the composite ratio of infill material, i.e. normal type specimen was formed by the sand and the rubber chip with 1:1 volume ratio, 2:1 for hard and 1:2 for soft. To identify the model parameters, multi-intensity multi-area impact test which was constructed by ten grades of impact intensities and five kinds of test feet were performed to each specimen. Although the identification accuracies were not so high, the parameter sets for the each specimen calculated from the identification could represent the differences of the specimens and simulate the FR (Force Reduction) values as shock attenuation properties against the landing impact of running. In conclusions, FR values decreased with increasing the impact duration at the same impact area and also decreased with increasing impat area at the same impact duration.
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The Proceedings of Mechanical Engineering Congress, Japan, 2015 _J2320104--_J2320104-, 2015In this paper, two foot strike pattern, which are the rear foot strike (RFS) and the fore foot strike (FFS), are compared from the viewpoint ofthe joint moment, joint reaction force and muscle activity using the actual measurement of running for two subjects. As the results, the landing impact force has two peaks for RFS while one peak for FFS, and the significant features can be observed in the ankle joint rather than the knee and hip joint. The joint moment of the ankle joint for RFS acts toward the dorsal flexion direction at the beginning of landing, and then toward the plantar flexion direction, while the one for FFS acts toward the plantar flexion direction during landing. The bone-on-bone force for RFS shows two peaks as similar with the landing impact force. For RFS, the Tibialis anterior much works while for FFS, the Gastrocnemius and the Soleus works much. Moreover, the differences of subject A and B are shown as the contribition of joints on the running.
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Dynamics and Design Conference : D & D, 2014 "125-1"-"125-10", Aug, 2014It is very useful to elucidate the mechanism of movement of the human body during running motion because of the improvement of the motion and the efficient training for the high competition performance, and the prevention and prediction of failure. There are two types of running pattern, such as Rear-foot strike (RFS) that is landing from heel, and Fore-foot strike (FFS) that is landing from fore foot. Many runners are running by the RFS way, but in recent years, FFS has attracted the attention. In this study, the difference between RFS and FFS are investigated from the joint moment and muscle force during running. To this end, the running movement is measured and the joint moments and muscle forces are analyzed by using the software AnyBody. As the results, it was shown that the vertical reaction force and the activity of tibialis anterior (TA) are significantly different for two running patterns.
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SHD, 2013 _126-1_-_126-8_, 2013The purpose of this study was to investigate the difference of joint motion and state of ball-contact between the pitches of fastball and breaking ball. The joint motion of upper limb, trunk and lower limb during baseball pitch were measured by accelerometers and gyro sensors. The state of ball-contact was measured indirectly by eight strain gauges attached to the surface of nail of 2nd and 3rd finger. Four subjects belonged to a college baseball team participated in this study and pitched fastball and breaking ball such as slider, shoot, forkball and curve ball five to ten times. Measuring with the sensors mentioned above, the angular velocities of joint motions and the strain of nail during the ball-contact were obtained directly or calculated. Those were rotation and tilting forward of trunk, rotation of hip, swing of forearm and upper arm, pronation of forearm, internal rotation of shoulder, rotation and swing of both side thighs, and left leg. As the results of analysis of the joint motion and the strain of nails, the following were clarified. The joint motions during the pitches of slider were similar to those during the pitches of fastball. The timing of ball-release of fastball pitches were later than that of slider pitches, and were earlier than that of shoot pitches. The strain of nail during the pitch of fastball was larger at nail tips called 'N' in this study. During the pitch of slider, the strain was larger at radial side of nail called 'W' in this study.
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日本機械学会誌, 116(1137) 525-525, 2013
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SHD, 2012 181-184, 2012Variation of motion during baseball pitches with constant effort to be constant speed and control was examined with inertial sensors and strain gauges. The measuring items were the angular velocities about two axes of thighs and leg, the angular velocities of rotation of torso and hip, and forward tilting of torso, the angular velocities of internal/external rotation of shoulder and pronation/supination of forearm, the angular velocities of swing at upper arm and forearm, and strains of nails of 2nd finger and 3rd finger. The variations of the angular velocities during constant baseball pitches were relatively larger at leg and thighs and were smaller at upper limb and shoulder.
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SHD, 2012 324-329, 2012To evaluate the dynamic behavior of human body at landing, a link model, a musculoskeletal model or multi-degrees-of-freedom model are generally used. In this study, the relation of these models is investigated. The movements of the reference points on the body and the floor reaction force were measured at landing. A four-degrees-of-freedom (4-dof) model is constructed and the parameters are identified such as to reconstruct the measured reaction force. And a four-link (4-link) model is also constructed and the joint forces and the moments are obtained by the inverse dynamics. It was shown that the joint reaction force from the 4-dof model and the vertical component of the joint reaction force from 4-link model agreed well. The joint reaction force from the link model is constructed by the joint forces and the muscle forces, so that the joint reaction force from the M-dof model can evaluate the joint force and the muscle force.
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The Proceedings of Mechanical Engineering Congress, Japan, 2011 _J231022-1-_J231022-5, 2011To evaluate the dynamic behavior of human body at landing, a link model, a musculoskeletal model or multi-degrees-of-freedom model are generally used. In this study, the relation of these models is investigated. The movements of the reference points on the body and the floor reaction force were measured at landing. A four-degrees-of-freedom (4-dot) model is constructed and the parameters are identified such as to reconstruct the measured reaction force. And a four-link (4-link) model is also constructed and the joint forces and the moments are obtained by the inverse dynamics. It was shown that the joint reaction force from the 4-dof model and the vertical component of the joint reaction force from 4-link model agreed well. The joint reaction force from the link model is constructed by the joint forces and the muscle forces, so that the joint reaction force from the M-dof model can evaluate the joint force and the muscle force.
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SHD, 2011 208-213, 2011To evaluate the dynamic behavior of human body at landing, a link model, a musculoskeletal model or multi-degrees-of-freedom model are generally used. In this study, the relation of these models is investigated. The movements of the reference points on the body and the floor reaction force were measured at landing. A four-degrees-of-freedom (4-dof) model is constructed and the parameters are identified such as to reconstruct the measured reaction force. And a four-link (4-link) model is also constructed and the joint forces and the moments are obtained by the inverse dynamics. It was shown that the joint reaction force from the 4-dof model and the vertical component of the joint reaction force from 4-link model agreed well. The joint reaction force from the link model is constructed by the joint forces and the muscle forces, so that the joint reaction force from the M-dof model can evaluate the joint force and the muscle force.
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Symposium on sports and human dynamics, 40-43, 2010Strains of nails before and after ball-release of baseball pitch were measured with strain gauges affixed on nails of 2nd and 3rd fingers. The measurements of strains were executed during simulating ball-release of straight ball, shoot ball and slider ball pitches, and actual pitching. The characteristics of strain of nails before and after ball-release were clarified and the possibility for understanding the state between fingertip and ball was suggested.
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愛知大学情報メディアセンター紀要com, 18(2) 47-55, Mar, 2008
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愛知大学情報メディアセンター紀要com, 18(1) 31-41, Jul, 2007
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The Proceedings of the Symposium on sports and human dynamics, 2007 147-150, 2007On the overall cushioning characteristics of sport surface and sole, a interaction exists between the cushioning caused by viscoelastic deformation and the one caused by sliding friction. The characteristics has come investigation with the instrument that can be measured sliding friction force and velocity under landing impact.
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Bulletin of Physical Education Research, Aich Univ, 6 19-26, 1997
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Bulletin of Institute of Health and Sports Sciences,University of Tsukuba, 19(19) 147-158, Mar, 1996
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Bull. Inst. Health & Sport Sci., Univ. of Tsukuba, 19(19) 147-158, 1996
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ジョイント・シンポジウム, 95(45) 98-101, Oct, 1995
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Journal of Japan Society of Sports Industry, 4(1) 29-38, 1994The brain injury during a sports activity are caused by the percussion which involves collision to the head. To construct a protective environment for such collisions are one of the most important factors for the biomechanical problems. In this investigation, we will experiment the collision of a human head of the testee by using Judo Tatami mats within the safety limits. We propose the mathematical model which can computer simulate the experiment model which will make the reappearance of the head collision phenomenon, and also the head collision phenomenon itself by using the measurements of the impact force and the acceleration from the experiment.
Presentations
30-
SHD, 2017<p>In this study, we evaluated the running motion and the physical characteristics of body under the various floor condition. We measured, firstly, the running motion under three floor conditions, i.e., the rigid floor, one mat on the floor and two mats on the floor. From the measurement results, it was confirmed that the running motion did not change significantly due to the change of floor condition. Next, we simulated the running motion based on the multi-degree-of-freedom model whose parameters were identified such as to agree with the measured running motion. As the simulation results, it was shown that the rigidity of the hip joint became bigger in the case of running on one mat or two mats compared with the case of rigid floor.</p>
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SHD, 2017<p>In this study, an inverse dynamics analysis method considering swing leg motion was constructed only by using some wireless motion sensors.(WMS) First, it was confirmed that the acceleration data by the WMS agreed well with the one by the 3-dimensional motion analysis system. Then, the method to separate the hip joint reaction force obtained from the equation of motion of the body into the support leg and the swing leg and to identify the ground reaction force was constructed, i.e., the top down approach considering swing leg motion. For the actual running data, the ground reaction force was identified, and it was concluded that the result agreed well with the one by using the force plate. The method constructed in this study, therefore, is concluded to be applicable for the actual application.</p>
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Transactions of the JSME (in Japanese), 2016In this paper, two foot strike patterns, which are the rear foot strike (RFS) and the fore foot strike (FFS), are compared from the viewpoint of the joint moment, joint reaction force and muscle activity using the actual measurement of running for two subjects. As the results, the landing reaction force has two peaks for RFS while one peak for FFS, and the significant features can be observed in the ankle joint rather than the knee and hip joint. The joint moment of the ankle joint for RFS acts toward the dorsal flexion direction at the beginning of landing, and then toward the plantar flexion direction, while the one for FFS acts toward the plantar flexion direction during landing. The bone-on-bone force for RFS shows two peaks as similar with the landing impact force. For RFS, the Tibialis anterior much works while for FFS, the Gastrocnemius and the Soleus works much. Moreover, the differences of subject A and B are shown as the contribution of joints on the running.
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SHD, 2010Strains of nails before and after ball-release of baseball pitch were measured with strain gauges affixed on nails of 2nd and 3rd fingers. The measurements of strains were executed during simulating ball-release of straight ball, shoot ball and slider ball pitches, and actual pitching. The characteristics of strain of nails before and after ball-release were clarified and the possibility for understanding the state between fingertip and ball was suggested.
Professional Memberships
6Major Research Projects
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Grants-in-Aid for Scientific Research, Japan Society for the Promotion of Science, Apr, 2021 - Mar, 2024
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Grants-in-Aid for Scientific Research, Japan Society for the Promotion of Science, Apr, 2018 - Mar, 2021
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Grants-in-Aid for Scientific Research, Japan Society for the Promotion of Science, Apr, 2015 - Mar, 2018
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Development of shock attenuation testing device and evaluation method for a long pile synthetic turfGrants-in-Aid for Scientific Research, Japan Society for the Promotion of Science, 2011 - 2013
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科学研究費助成事業, 日本学術振興会, 2009 - 2010
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科学研究費助成事業, 日本学術振興会, 1996 - 1996