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Laurent Vigouroux Marine Devise Théo Cartier Clément Aubert Eric Berton 《Journal of sports sciences》2019,37(8):886-894
Pull-ups are often used by sport-climbers and other athletes to train their arm and back muscle capabilities. Sport-climbers use different types of holds to reinforce finger strength concomitantly. However, the effect of grip types on pull-up performance had not previously been investigated. A vertical force platform sensor measured the force exerted by climbers when performing pull-ups under six different grip conditions (gym-bar, large climbing hold, and four small climbing holds: 22mm, 18mm, 14mm, and 10mm). The electromyography of finger flexors and extensor muscles were recorded simultaneously. The maximal arm power and summed mechanical work were computed. The results revealed that the number of pull-ups, maximal power, and summed mechanical work decreased significantly with the size of the climbing hold used, even if no differences were found between a large climbing hold and a gym-bar. Electromyography of the forearm muscles revealed that the use of a climbing hold generated finger flexor fatigue and that the level of cocontraction was impacted by the different segment coordination strategies generated during the pull-ups. These findings are likely to be useful for quantifying training loads more accurately and designing training exercises and programs. 相似文献
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预警原则作为一种新颖的环境资源管理手段,其对海洋渔业资源养护的有效性已为一些国际协定和国外立法所确认。适用预警原则应满足以下条件:存在不确定危险;遵循成本收益分析原则、比例原则和非歧视原则;并定期检查、适时调整。目前我国海洋渔业资源管理工作也面临着内外双重压力,有必要在未来制定一部《海洋生物资源养护和管理法》。而当务之急是尽快修订现行《渔业法》,将预警原则确定为我国海洋渔业资源管理的基本原则;同时,还应通过建立综合性海洋管理部门、大量搜集科学信息、拓展群众参与途径、以及根据各海域的具体情况,有针对性地实施预警原则,促进我国海洋渔业资源的可持续利用。 相似文献
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学校是培养面向 2 1世纪人才的基地 ,加强学生的全面素质教育已成为教育战线的共识。要完成这一任务 ,关键要有一支高素质的学校体育教师队伍。因此 ,提高学校体育教师自身素质 ,直接关系到学生全面素质的提高和高质量人才的培养 相似文献
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Marine Portex Carolane Hélin Corinne Ponce Jean-Noël Foulin 《Reading and writing》2018,31(6):1435-1448
In left-to-right writing cultures, spontaneous mirror writing of letters and digits in preliterate children appears more frequently on left-than right-facing characters. A compelling theory drawn on neuropsychological evidence of mirror generalization suggests that children resort to a right-orienting/writing rule when learning to write. The aim of the present study was to conceptually replicate and specify recent findings (Fischer, 2017a) on the predominant contribution of writing directionality to mirror writing in preliterate children. A training study was designed to compare on-line production of conventional versus mirror writing of 4-to-5 year-old French children (n?=?30). Over a 4-week period, children were taught to write from memory words and digits. During a subsequent writing-from-memory task, a spatial constraint (Cornell, 1985) was imposed to elicit paired conventional and mirror writing of the words/digits. Spatial and kinematic data were recorded through the use of a digital pen. The results indicate a main contribution of writing directionality to letter and digit reversals. Furthermore, kinematic equivalence between conventional and mirror writing supports the neurological mirror generalization process in children. Overall, these results constitute a further illustration that the manifestation of mirror writing in typically developing children is culture-bound. 相似文献
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高校非主流"文化"对青年学生成才的影响 总被引：4，自引：0，他引：4
随着高校校园围墙的打开，校园化也日益走向多元化。非主流化的存在以它独特的表现形式诠释着当代青年学生的另类心绪，它所带来的负面效应冲击着今天的大学校园。本旨在从对非主流化概念性质的界定和其现象表现的概括中，分析非主流“化”对青年学生成才的影响，力求引导其健康发展，成为主流化的有益补充。 相似文献