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Sentaro Koshida Takanori Ishii Tadamitsu Matsuda Toshihiko Hashimoto 《European Journal of Sport Science》2017,17(4):417-424
It is generally accepted that proper learning of the breakfall technique during early judo training is essential for attenuating the risk of judo-related head injury. Therefore, it is critical to understand the kinematics and head injury risks of breakfall motion to design a more safe and effective judo teaching paradigm that results in reduction of injury risk. We aimed to investigate the biomechanics of judo backward breakfalls by comparing osoto-gari and ouchi-gari in novice judokas. Twelve male novice judokas (age: 21.3 years, SD?=?0.6 years; height: 1.74?m, SD?=?0.04?m; body weight: 71.3, SD?=?6.4?kg; body mass index: 23.5, SD?=?2.3) volunteered to participate in this study. The kinematic data of the breakfall motion for both osoto-gari and ouchi-gari were collected using a three-dimensional motion analysis technique (200?Hz). We observed significant differences between the movement patterns for the two techniques, especially in the lower extremity movements. In addition, a significantly greater peak extension momentum (osoto-gari: 1.29, SD?=?0.23?kg?m2?s?1; ouchi-gari: 0.84, SD?=?0.29?kg?m2?s?1) and lower head position along the vertical axis (osoto-gari: 0.18, SD?=?0.05?m; ouchi-gari: 0.31, SD?=?0.08?m) with a large effect size were found in the breakfall for osoto-gari. Our results suggest that a different paradigm is needed for effectively teaching each breakfall technique that will enable us to substantially lower the risk of judo-related head injuries in novice judokas. 相似文献
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Abstract This study identifies the responsibilities of the bodies and institutions involved in the implementation of the Bologna Process. They include the levels of Europe, nations, higher education institutions, departments, degree programmes, teachers and students. The future planning is analysed using the Balanced Scorecard approach designed for the communication and implementation of the strategy. The approach is used to analyse the objectives of European education policy from the different perspectives. Strategic planning and quality assurance are most efficient when they are transformed into action at the closest possible point to teaching and learning. 相似文献
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Nakano T Itoyama T Yoshida K Sawada Y Ikeda S Fukuda T Matsuda T Negoro M Arai F 《Biomicrofluidics》2010,4(4):46505
We proposed and fabricated multiscale transparent arteriole and capillary vessel models with circular cross sections of 10-500 μm using photolithography. The circularities of the fabricated 10, 50, and 500 μm diameter microchannels were 84.0%, 61.5%, and 82.3%, respectively. Next, we connected these different models to realize a circulation type blood vessel model simulating arteriole networks. We proposed a novel connection method using an intermediate connector made of wax, which we used to connect these models to make a circulation model. In flow experiments, the fabricated models showed no leakage and circulation models with seamless connections were achieved. 相似文献
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Abstract The frequency of one-legged stance and two-legged stance differs considerably among sports. We therefore expect the balance ability of athletes from different sports to vary. This study compared the sway characteristics during a static one-legged stance of soccer players, basketball players, swimmers, and non-athletes. The centre of pressure sway during one-legged stance of ten male participants representing each of the four groups was measured using a stabilometer. Centre of pressure sway was assessed by four sway factors: sway velocity, anterior-posterior sway, horizontal sway, and high-frequency sway. None of the four groups of participants showed significant differences in body sway between standing on the dominant leg and standing on the non-dominant leg. The soccer players had more high-frequency sway and less anterior-posterior sway and horizontal sway than the basketball players, swimmers, and non-athletes. These results suggest that soccer players have superior ability to maintain a stable one-legged stance. Further study is required to determine how much of the superior balance ability in soccer players is innate and how much is developed through training, as well as to determine the relationship between balance ability and playing performance. 相似文献
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Toshiki Matsuda 《美中教育评论》2008,5(3):24-30
NIER （National Institute of Educational Research, 2004） survey revealed that the most common attitude of Japanese high school students to mathematics is that ＂it is not useful in daily life but must be learnt for entrance examinations＂. It was also clarified that only 3.2 percent of mathematics teachers use computers in their classes. Therefore, a training system to improve teachers＇ professional competence through the design of lessons which will improve students＇ ability to solve problems in daily life was developed using ICT （Information and Communication Technology） in conjunction with mathematical thinking processes. The lAG （Instructional Activities Game） system developed by Matsuda （2004） was used to provide a platform for the execution of several game boards, which were designed to achieve different objectives for different conditions of teaching. Herein, the design of the STG （Simulate Teaching Game） game board and data sets of teaching materials and menu items for lesson plans are described, together with the means of elaborating the lAG system if new functions are required. 相似文献
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Matt Matsuda and David Williams report on a successful collaboration between academic and student services that resulted in a Rutgers University Byrne Seminar on social entrepreneurship. 相似文献
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Sentaro Koshida Takanori Ishii Tadamitsu Matsuda Toshihiko Hashimoto 《Journal of sports sciences》2017,35(11):1059-1065
Previous studies suggest that increasing the skill level of judokas will decrease the number of head injuries sustained during judo. However, the kinematics are poorly understood, making it difficult to establish an effective breakfall teaching programme. Therefore, we studied the kinematic parameters of breakfall for osoto-gari to identify the risk of judo-related head injuries by comparing experienced and novice judokas. This information will provide insight into developing a better prevention plan for judo-related head injuries.
A total of 10 experienced and 12 novice judokas volunteered to participate in this study. The kinematic data of the breakfall motion for osoto-gari were collected using a three-dimensional motion analysis technique (200 Hz).
We observed a significantly higher peak neck extension momentum in the novice group than in the experienced group. This suggests that neck extension momentum during breakfall is associated with the risk of head injuries during judo. In addition, the novice judokas demonstrated a significantly greater flexed pattern in the trunk and hip movement than the experienced judokas (P < 0.05). The results suggest that the trunk and lower extremity motion are important kinematic parameters that determine the skill level in performing the breakfall for osoto-gari. 相似文献
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Shigetada Kudo Yoshihisa Sakurai Takahiro Miwa Yuji Matsuda 《Journal of sports sciences》2017,35(10):945-952
This study re-evaluated the magnitude of hand propulsion (HP) in the pull and push phases of the front crawl stroke and investigated the association between the angular velocity of shoulder roll (ωSR) and hand propulsive lift (HPL). ωSR was computed in the plane normal to a forward direction for 16 skilled swimmers performing the front crawl stroke at a maximal sprinting pace. HP, hand propulsive drag (HPD) and HPL were determined by a dynamic pressure approach. HP and HPD in the pull phase were greater than in the push phase (P < 0.05) while HPL in the pull phase was similar to that in the push phase. Eleven swimmers out of the 16 swimmers had a significant within-swimmers correlation between ωSR and HPL in the push phase (P < 0.05). That is, HPL increased in the push phase as the ωSR of rolling back to the neutral position became faster. A swimmer should use more drag for hand propulsion in the pull phase and propulsion from drag and lift equally in the push phase. Based on the relationship between ωSR and HPL in the push phase, a possible stroke technique to enhance HPL using ωSR is discussed. 相似文献