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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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Naoko Saito 《Educational Philosophy and Theory》2019,51(5):478-487
AbstractThis article will highlight the distinctive role of Cavell in renewing a dawn of American philosophy. Following Emerson’s remark, ‘the inmost in due time becomes the outmost’, Cavell develops his distinctive line of antifoundationalist thought. To show how unique and valuable Cavell’s endeavor to resuscitate Emerson’s and Thoreau’s voice in American philosophy is, this paper discusses the political implications of Cavell’s Emersonian moral perfectionism. This involves a reconsideration of what measures justice and what justifies happiness. While Cavell is sometimes said to be too personal and too subjective to be political, I shall argue that his Emersonian perfectionism, with its concomitant idea of the conversation of justice, is in fact thoroughly political and democratic. I shall illustrate this by examining his writing on a Hollywood film, Mr. Deeds Goes to Town (1936). The film shows vividly that happiness is a condition for achieving democracy from within. In conclusion, I shall propose that a readiness for the risk inherent in speech, rather than, say, acquiescing in received ideas or hiding behind the words of others, is at the heart of perfectionist education for globally minded citizens. 相似文献
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Can earlier literacy skills have a negative impact on future home literacy activities? Evidence from Japanese 
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下载免费PDF全文 Tomohiro Inoue George K. Georgiou Naoko Muroya Hisao Maekawa Rauno Parrila 《Journal of Research in Reading》2018,41(1):159-175
We examined the cross‐lagged relations between the home literacy environment and literacy skills in Japanese, and whether child's gender, parents' education and child's level of literacy performance moderate the relations. One hundred forty‐two Japanese children were followed from Grades 1 to 2 and assessed on character knowledge, reading fluency and spelling. Their parents responded to a questionnaire assessing the frequency of their teaching and shared reading. Results showed that parent teaching increased and shared reading decreased from Grades 1 to 2. Cross‐lagged path analysis indicated that the literacy skills in Grade 1 were negatively associated with parent teaching in Grade 2. The results further suggested that more educated parents of higher performing children, particularly boys, adjusted their involvement to their children's literacy skills, while less educated parents of lower performing children did not. These findings indicate the importance of parents' sensitivity to their child's performance. What is already known about this topic
- Home literacy environment (HLE) plays an important role in children's literacy acquisition in Western and some East Asian contexts.
- Children's early reading skills can have an impact on later HLE.
- The direction of the relationship between HLE and children's reading skills may change from positive in Kindergarten to negative in Grade 1.
- In line with the findings of previous studies in other languages, Japanese parents adaptively adjust their home literacy activities to their child's literacy skills.
- The effect of children's literacy skills on later shared reading is stronger among boys than among girls.
- More educated parents of higher performing children adjust their involvement to their child's literacy skills, while less educated parents with lower performing children do not.
- We should encourage parents to be sensitive to their child's literacy skills to help them build a foundation that will boost future literacy development.
- This can be particularly true of less educated parents with poorly performing children.
- We should encourage educators to communicate the children's literacy achievement to their parents and also suggest the means by which HLE could be beneficial for their children's literacy development.
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论梁启超《清代学术概论》中的科学精神 总被引：1，自引：0，他引：1
石井刚 《内蒙古大学学报(人文社会科学版)》2000,32(5):35-39
在《清代学术概论》中,梁启超将清代思潮的变迁过程分成三个不同的阶段.而贯穿三个阶段他所予以重视的关键性精神即是“科学精神”.梁启超所关心的问题在于学问该如何得到发展,并且忧虑“致用”的主观动机容易介入研究过程,从而影响其客观性,因此,梁启超主张学者应避开去问所治的学问是否实用.“为学问而治学问”,这就是梁启超《清代学术概念》中所要表达的中心思想.梁启超深刻地体会到了政治权力主宰真理和正义的严酷现实,他所站到的非政治性立场本身就在政治社会环境中.《概论》在政治思想史学上具有深刻的意义. 相似文献
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Takanori Ishii Michiyoshi Ae Yuta Suzuki Yasuto Kobayashi 《Sports biomechanics / International Society of Biomechanics in Sports》2018,17(2):238-250
This study sought to identify biomechanical factors that determine fast and skilful execution of the seoi-nage (shoulder throw) technique by comparing kinematics between elite and college judo athletes. Three-dimensional motion data were captured using a VICON-MX system with 18 cameras operating at 250 Hz as three male elite and seven male college judo athletes performed seoi-nage. No significant difference was found in motion phase time of the turning phase between the two groups, indicating that motion phase time is not necessarily a factor contributing quickness in seoi-nage. The maximum relative velocity of the whole body centre of mass along the anterior–posterior direction was significantly greater in the elite athletes (2.74 ± 0.33 m/s) than in the college athletes (1.62 ± 0.47 m/s) during the turning phase (p = 0.023). The overall angular velocity of the body part lines, particularly the arm line, tended to be greater in the elite athletes (p = 0.068). The results imply that the velocity of the thrower relative to the opponent in the forward drive and turning motion reflects high skill seoi-nage. Coaches should recognise the relative forward velocity as a factor that may contribute to a successful seoi-nage when teaching the judo throw technique. 相似文献
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