全文获取类型
收费全文 | 15464篇 |
免费 | 186篇 |
国内免费 | 11篇 |
专业分类
教育 | 10583篇 |
科学研究 | 2014篇 |
各国文化 | 120篇 |
体育 | 1055篇 |
综合类 | 5篇 |
文化理论 | 102篇 |
信息传播 | 1782篇 |
出版年
2021年 | 160篇 |
2020年 | 210篇 |
2019年 | 311篇 |
2018年 | 475篇 |
2017年 | 420篇 |
2016年 | 406篇 |
2015年 | 250篇 |
2014年 | 389篇 |
2013年 | 2676篇 |
2012年 | 333篇 |
2011年 | 364篇 |
2010年 | 320篇 |
2009年 | 288篇 |
2008年 | 347篇 |
2007年 | 288篇 |
2006年 | 280篇 |
2005年 | 250篇 |
2004年 | 287篇 |
2003年 | 207篇 |
2002年 | 214篇 |
2001年 | 308篇 |
2000年 | 302篇 |
1999年 | 275篇 |
1998年 | 160篇 |
1997年 | 192篇 |
1996年 | 182篇 |
1995年 | 133篇 |
1994年 | 147篇 |
1993年 | 149篇 |
1992年 | 262篇 |
1991年 | 230篇 |
1990年 | 216篇 |
1989年 | 231篇 |
1988年 | 207篇 |
1987年 | 194篇 |
1986年 | 194篇 |
1985年 | 203篇 |
1984年 | 167篇 |
1983年 | 184篇 |
1982年 | 153篇 |
1981年 | 144篇 |
1980年 | 135篇 |
1979年 | 196篇 |
1978年 | 153篇 |
1977年 | 146篇 |
1976年 | 126篇 |
1975年 | 102篇 |
1974年 | 122篇 |
1973年 | 115篇 |
1972年 | 98篇 |
排序方式: 共有10000条查询结果,搜索用时 419 毫秒
961.
Marc F. Moreira Jorge E. Morais Daniel A. Marinho António J. Silva Tiago M. Barbosa 《Sports biomechanics / International Society of Biomechanics in Sports》2014,13(1):62-74
This study aimed to analyse the effect of growth during a summer break on biomechanical profile of talented swimmers. Twenty-five young swimmers (12 boys and 13 girls) undertook several anthropometric and biomechanical tests at the end of the 2011–2012 season (pre-test) and 10 weeks later at the beginning of the 2012–2013 season (post-test). Height, arm span, hand surface area, and foot surface area were collected as anthropometric parameters, while stroke frequency, stroke length, stroke index, propelling efficiency, active drag, and active drag coefficient were considered as biomechanical variables. The mean swimming velocity during an all-out 25 m front crawl effort was used as the performance outcome. After the 10-week break, the swimmers were taller with an increased arm span, hand, and foot areas. Increases in stroke length, stroke index, propelling efficiency, and performance were also observed. Conversely, the stroke frequency, active drag, and drag coefficient remained unchanged. When controlling the effect of growth, no significant variation was determined on the biomechanical variables. The performance presented high associations with biomechanical and anthropometric parameters at pre-test and post-test, respectively. The results show that young talented swimmers still present biomechanical improvements after a 10-week break, which are mainly explained by their normal growth. 相似文献
962.
Guillaume Mornieux Dominic Gehring Patrick Fürst Albert Gollhofer 《Journal of sports sciences》2014,32(13):1255-1262
AbstractAnticipatory postural adjustments (APAs), i.e. preparatory positioning of the head, the trunk and the foot, are essential to initiate cutting manoeuvres during football games. The aim of the present study was to determine how APA strategies during cutting manoeuvres are influenced by a reduction of the time available to prepare the movement.Thirteen football players performed different cutting tasks, with directions of cutting either known prior to the task or indicated by a light signal occurring 850, 600 or 500 ms before ground contact.With less time available to prepare the cutting manoeuvre, the head was less orientated towards the cutting direction (P = 0.033) and the trunk was even more rotated in the opposite direction (P = 0.002), while the foot placement was not significantly influenced. Moreover, the induced higher lateral trunk flexion correlated with the increased knee abduction moment (r = 0.41; P = 0.009).Increasing lateral trunk flexion is the main strategy used to successfully perform a cutting manoeuvre when less time is available to prepare the movement. However, higher lateral trunk flexion was associated with an increased knee abduction moment and therefore an increased knee injury risk. Reducing lateral trunk flexion during cutting manoeuvres should be part of training programs seeking the optimisation of APAs. 相似文献
963.
964.
965.
966.
967.
Sans résumé 相似文献
968.
969.
970.