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The aim of this study was to examine the relationship between shoulder alignment and elbow angle during the delivery action of fast-medium bowlers. The elbow and upper trunk alignment were recorded for 13 high-performance bowlers (mean age 20 years) using a 12-camera Vicon motion analysis system operating at 250 Hz. The three highest velocity trials for "good" and "short" length deliveries were analysed. Results showed that bowlers with a more front-on shoulder alignment at back-foot impact and when the upper arm was horizontal to the ground experienced a significantly greater elbow flexion--extension range when compared with those who had a more side-on orientation at the same point in the delivery action. Bowlers with greater shoulder counter-rotation also recorded higher elbow flexion and subsequently extension during the period from upper arm horizontal to ball release. Shoulder alignment and elbow angles were similar for "short" and "good" length deliveries. It was concluded that bowlers with a more front-on shoulder orientation at back-foot impact demonstrated a higher elbow extension from upper arm horizontal to ball release and are therefore more likely to infringe International Cricket Council elbow tolerance levels, compared with those who adopt a more side-on shoulder orientation at back-foot impact. 相似文献
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眼前的这个男人显得有些不高兴,他不能入睡,脑中的想法在飞速地旋转着。这是二月的一个黎明时分。此刻,这个人独自坐在位于奥兰多濒临Lake Butler的一幢价值550万美元的豪宅里沉思。慢慢地,一种焦虑感让他不能自已。 相似文献
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We provide here a brief historical analysis of a movement in progress from a belief‐based “mystery” model to an evidence‐based “mastery” model of giftedness and talent development. We have observed that educators concerned about exceptionally capable learners are moving from a categorical notion of “the typical gifted child” with somewhat mysteriously defined attributes and learning needs, toward the perspective that some children have exceptionally advanced learning needs that require more flexibly responsive educational attention. We discuss factors that differentiate the two models, and observe some benefits of the shifting paradigm, arguing that by conceptualizing gifted education as providing a dynamically responsive educational match for students who otherwise experience a mismatch with the curriculum normally provided, the mastery model is socially, educationally, and politically more defensible. We discuss some practical implications of this shift in perspective. 相似文献