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The influence of preparation time on ankle joint biomechanics during highly dynamic movements is largely unknown. The aim of this study was to evaluate the impact of limited preparation time on ankle joint loading during highly dynamic run-and-cut movements. Thirteen male basketball players performed 45°-sidestep-cutting and 180°-turning manoeuvres in reaction to light signals which appeared during the approach run. Both movements were executed under (1) an easy condition, in which the light signal appeared very early, (2) a medium condition and (3) a hard condition with very little time to prepare the movements. Maximum ankle inversion angles, moments and velocities during ground contact, as well as EMG signals of three lower extremity muscles, were analysed. In 180°-turning movements, reduced preparation time led to significantly increased maximum ankle inversion velocities. Muscular activation levels, however, did not change. Increased inversion velocities, without accompanying changes in muscular activation, may have the potential to destabilise the ankle joint when less preparation time is available. This may result in a higher injury risk during turning movements and should therefore be considered in ankle injury research and the aetiology of ankle sprains. 相似文献
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Barrett Jentry S. Schachter Rachel E. Gilbert Danni Fuerst Mathew 《Early Childhood Education Journal》2022,50(3):385-397
Early Childhood Education Journal - Active engagement in music has numerous academic and social benefits for young children and music-making is included in many early childhood standards and... 相似文献
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贾民 《淮南职业技术学院学报》2007,7(4):13-15
依据美术教学的内在规律,分析了学校美术基础教学的三个层面,提出了在美术教学中,必须不断改革教学方法,更新教学手段,使美术教学再上新水平,从而推进素质教育的全面实施。 相似文献
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贾亚飞 《辽宁科技学院学报》2003,5(1):35-36,49
分析了影响沥青路面平整度的各种因素，并针对存在的各种因素在施工中应注意的问题提出了相应的建议。 相似文献
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综合各家迁移理论,应用广义相似原理在教材的选编、教法的选择和练习的设计等方面实现"为迁移而教"的 目的。展望未来,广义相似说在体育教学中的应用具有积极的意义。本文就广义相似说在教材的选编、教法的选择和练 习的设计中的应用作一尝试研究。 相似文献
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Separate groups of rats were trained and tested on asymmetrically and symmetrically reinforced successive delayed matching-to-sample (DMTS) or delayed discrimination (DD) tasks in Experiment 1. Each rat received training and testing on symmetrically reinforced DMTS and DD tasks in Experiment 2. The only difference between each task was that the rats had to respond correctly to a light or tone test stimulus, S2, if it matched a light or tone sample stimulus, S1, in DMTS, but could respond to either S2 if S1 had been a particular stimulus in DD. Only correct leverpresses were reinforced in the asymmetrically reinforced version of each task. Both correct presses and correct omissions were reinforced in the symmetrically reinforced version of each task. Response biases to leverpress during tests for delayed responding to S1 were reduced in both symmetrically reinforced tasks, but only in the DD task did such contingencies produce consistently poorer performance in responding to either S, in Experiment 1. Declines in accuracy of performance that occurred in both experiments were greater to the visual than to the auditory S1 only in the DMTS tasks with increased intervals between S1 and S2. A third experiment, in which rats had to respond to S2 if it matched S1 (DMTS) or if S2 mismatched S, (DMmTS), was carried out. Modality of S1 similarly affected accuracy of delayed responding in each task, as in the first two experiments. Methodological and theoretical implications of these results are discussed in terms of Honig and Thompson’s (1982) dual-process theory of working memory. 相似文献
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如何制订面向全体学生的课堂教学目标 总被引：3，自引：2，他引：1
体育课的教学目标应该是面向全体学生的,考虑到学生的个体差异,教学目标应该表现为:方向目标与达成目标的统一;学生目标与教师目标的统一;个体目标与群体目标的统一. 相似文献
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文章通过梳理相关历史文献并结合田野调查资料,描绘了新疆撒拉族的历史渊源和形成的历史过程;新疆撒拉族在迁徙的历史进程中,为了立足新的环境与周边民族文化进行了长期的互动、积极调适,社会文化发生了积极的变迁. 相似文献