全文获取类型
收费全文 | 890篇 |
免费 | 20篇 |
专业分类
教育 | 616篇 |
科学研究 | 84篇 |
各国文化 | 11篇 |
体育 | 115篇 |
文化理论 | 22篇 |
信息传播 | 62篇 |
出版年
2023年 | 7篇 |
2022年 | 11篇 |
2021年 | 12篇 |
2020年 | 21篇 |
2019年 | 35篇 |
2018年 | 36篇 |
2017年 | 56篇 |
2016年 | 50篇 |
2015年 | 35篇 |
2014年 | 41篇 |
2013年 | 162篇 |
2012年 | 30篇 |
2011年 | 28篇 |
2010年 | 38篇 |
2009年 | 28篇 |
2008年 | 41篇 |
2007年 | 19篇 |
2006年 | 25篇 |
2005年 | 21篇 |
2004年 | 24篇 |
2003年 | 17篇 |
2002年 | 21篇 |
2001年 | 12篇 |
2000年 | 10篇 |
1999年 | 3篇 |
1998年 | 6篇 |
1997年 | 6篇 |
1996年 | 10篇 |
1995年 | 7篇 |
1994年 | 9篇 |
1993年 | 7篇 |
1992年 | 8篇 |
1991年 | 7篇 |
1990年 | 2篇 |
1989年 | 8篇 |
1988年 | 5篇 |
1987年 | 5篇 |
1986年 | 4篇 |
1985年 | 2篇 |
1984年 | 2篇 |
1982年 | 4篇 |
1980年 | 2篇 |
1978年 | 4篇 |
1974年 | 3篇 |
1973年 | 2篇 |
1969年 | 2篇 |
1957年 | 3篇 |
1944年 | 3篇 |
1866年 | 1篇 |
1860年 | 1篇 |
排序方式: 共有910条查询结果,搜索用时 15 毫秒
861.
J. Dumortier A. Mariman J. Boone L. Delesie E. Tobback D. Vogelaers 《European Journal of Sport Science》2018,18(2):151-161
Training load (TL) and recovery should be in optimal balance to obtain maximal performance gains. We aimed to study sleep as a recovery technique and its relationship with TL and performance in elite athletes. Twenty-six elite female artistic gymnasts were divided into an under 13 (n?=?6), an under 14 (n?=?6), a junior (n?=?7; 14–15y) and a senior (=World Championship (WC) competitors, n?=?7; ≥16y) category. Sleep, through sleep logs, and training parameters, using the session Rate of Perceived Exertion (sRPE) scale, were monitored to calculate total sleep time (TST), sleep efficiency (SE), TL, monotony and strain. Performance of WC competitors was evaluated through coach and WC qualification ranking. For the entire group, TST (effect sizes (ES)?=??1.12, confidence intervals (CI)?=??60:?47, P?.05) and SE (ES?=??0.13, CI?=??1.40:?0.10, P?=?.022) were shorter during week than weekend nights. TST and SE were highest in youngest gymnasts (P?.05). TL was lowest in under 13 and senior gymnasts (P?.05), while TL, monotony and strain were highest in junior gymnasts (P?.05). A negative regression was found between TST and TL the day after, while higher TL also led to lower TST the following night (P?.001). For the WC competitors, TST the night before the qualifications was shorter than the mean TST of the WC period (ES?=??0.95, CI?=??170:24, P?=?.030). TST correlated with coach ranking (r?=??0.857, P?=?.014). Higher TL correlated with worse WC (r?=?0.829, P?=?.042) and coach (r?=?0.893, P?=?.007) ranking. This research in elite gymnasts indicated associations between decreased TST, augmented TL and inferior performance. Optimizing sleep and TL may therefore represent strategies to enhance performance. 相似文献
862.
863.
864.
It is common for the physiological working capacity of a triathlete when cycling and running to be assessed on two separate days. The aim of this study was to establish whether an incremental running test to exhaustion has a negative effect after a 5 h recovery from an incremental cycling test. Eight moderately trained triathletes (age, 26.2 +/- 3.4 years; body mass, 67.3 +/- 9.1 kg; VO2max when cycling, 59 +/- 13 ml x kg x min(-1); mean +/- s) completed an incremental running test 5 h after an incremental cycling test (fatigue) as well as an incremental running test without previous activity (control). Maximum running speed, maximal oxygen uptake (VO2max) and the lactate threshold were determined for each incremental running test and correlated with the average speed during a 5 km run, which was performed immediately after a 20 km cycling time-trial, as in a sprint triathlon. There were no significant differences in maximum running speed, VO2max or the lactate threshold in either incremental running test (control or fatigue). Furthermore, good agreement was found for each physiological variable in both the control and fatigue tests. For the fatigue test, there were significant correlations between the average speed during a 5 km run and both VO2max expressed in absolute terms (r = 0.83) and the lactate threshold (r = 0.88). However, maximum running speed correlated most strongly with the average speed during a 5 km run (r = 0.96). The results of this study indicate that, under controlled conditions, an incremental running test can be performed successfully 5 h after an incremental cycling test to exhaustion. Also, the maximum running speed achieved during an incremental running test is the variable that correlates most strongly with the average running speed during a 5 km run after a 20 km cycling time-trial in well-trained triathletes. 相似文献
865.
William E. Simon 《Academic Questions》1988,1(4):72-74
This essay originally appeared in the July 8, 1988 issue ofThe Wall Street Journal. It is reprinted here with theJournal's permission. 相似文献
866.
867.
868.
Simon Davies 《The Information Society》1996,12(1):89-94
The emerging Information Superhighway is starting to induce visions of dystopia within the medical profession. In several countries, doctors have opposed plans for the establishment of national health data networks. In the most recent example, the Council of the British Medical Association threatened to boycott the government's national data strategy. This action followed the lead of Australian doctors, many of whom have consistently opposed a national wide-area network for health data. In common is the fear that this data linkage will erode medical independence, increase the power of government health authorities, and eliminate the confidentiality of medical information. Doctors have a duty of care to patients to protect confidentiality, and they say the emerging national networks compromise this responsibility. Here, I argue that the emerging health superhighways should either conform to strict privacy standards or they should be demolished. 相似文献
869.
870.