全文获取类型
| 收费全文 | 1594篇 |
| 免费 | 33篇 |
| 国内免费 | 1篇 |
专业分类
| 教育 | 1074篇 |
| 科学研究 | 78篇 |
| 各国文化 | 15篇 |
| 体育 | 261篇 |
| 综合类 | 1篇 |
| 文化理论 | 16篇 |
| 信息传播 | 183篇 |
出版年
| 2023年 | 16篇 |
| 2022年 | 6篇 |
| 2021年 | 19篇 |
| 2020年 | 40篇 |
| 2019年 | 70篇 |
| 2018年 | 73篇 |
| 2017年 | 71篇 |
| 2016年 | 77篇 |
| 2015年 | 57篇 |
| 2014年 | 45篇 |
| 2013年 | 399篇 |
| 2012年 | 37篇 |
| 2011年 | 51篇 |
| 2010年 | 43篇 |
| 2009年 | 25篇 |
| 2008年 | 42篇 |
| 2007年 | 55篇 |
| 2006年 | 29篇 |
| 2005年 | 19篇 |
| 2004年 | 19篇 |
| 2003年 | 24篇 |
| 2002年 | 29篇 |
| 2001年 | 17篇 |
| 2000年 | 28篇 |
| 1999年 | 21篇 |
| 1998年 | 11篇 |
| 1997年 | 7篇 |
| 1996年 | 10篇 |
| 1995年 | 7篇 |
| 1994年 | 13篇 |
| 1993年 | 16篇 |
| 1992年 | 13篇 |
| 1991年 | 12篇 |
| 1990年 | 10篇 |
| 1989年 | 10篇 |
| 1988年 | 10篇 |
| 1987年 | 7篇 |
| 1986年 | 14篇 |
| 1985年 | 12篇 |
| 1984年 | 11篇 |
| 1983年 | 15篇 |
| 1982年 | 16篇 |
| 1981年 | 15篇 |
| 1980年 | 6篇 |
| 1979年 | 7篇 |
| 1978年 | 8篇 |
| 1977年 | 8篇 |
| 1975年 | 9篇 |
| 1973年 | 8篇 |
| 1964年 | 4篇 |
排序方式： 共有1628条查询结果，搜索用时 46 毫秒
61.
62.
63.
The purpose of this study was to test the hypothesis that increased availability of blood-borne glucose would improve endurance after carbohydrate loading. A single-leg exercise model was employed, taking advantage of the fact that supercompensation of muscle glycogen occurs only in a previously exercised limb. Endurance time to exhaustion at 70% of maximal oxygen uptake (VO2 max) was determined for 11 males and three females who were then allocated to a control group or a high-carbohydrate (CHO) group. For 3 days following Test 1 the control group maintained a prescribed normal diet whilst the CHO group increased the proportion of energy derived from carbohydrate (62.1 +/- 4.3% cf. 43.9 +/- 2.0%, P less than 0.01). The endurance test was then repeated using the leg that was inactive during Test 1. Endurance time was increased on Test 2 (123.7 +/- 43.2 min cf. 98.5 +/- 21.9 min, P less than 0.05 one-tailed test) for the CHO group but not for the control group (101.8 +/- 21.7 min cf. 107.5 +/- 9.1 min, NS). There was no indication of enhanced carbohydrate metabolism during Test 2 for the CHO group but mean heart rate was lower during Test 2 than during Test 1 (145 +/- 14 beat min-1 cf. 152 +/- 12 beat min-1, P less than 0.05). These results suggest that the prior consumption of a high-carbohydrate diet improves endurance during high-intensity cycling with a limb with normal muscle glycogen concentration. 相似文献
64.
65.
66.
68.
69.
70.
Richards R Williams S Poulton R Reeder AI 《Research quarterly for exercise and sport》2007,78(5):413-419
This study examined the strength of tracking sport participation from childhood to early adulthood among the Dunedin Multidisciplinary Health and Development Study cohort. Participation in sport, dance, or gymnastics as part of a club or group (outside of school) was assessed at ages 7, 9, 15, 18, and 21 years. In addition to the traditionally used correlation coefficients, summary statistics (intraclass correlations; ICC) from random effect models and stability coefficients from generalized estimating equations (GEE) were calculated using all the longitudinal data and controlling for the influence of covariates on tracking strength. Correlation coefficients revealed statistically significant tracking of club sport participation (7-21 years) at low levels (r = .07-0.28). The ICC summary statistic (0.23) was consistent with this, while the GEE suggested moderate tracking (0.59). The results of this study suggest that encouraging sport participation during childhood and adolescence may result in a modest increase in the likelihood of participation later in life. However, the substantial movement into and out of sport participation observed here and in other studies cautions against relying solely on sport promotion among youth as a strategy to promote lifelong participation. 相似文献