收费全文 | 45081篇 |
免费 | 3913篇 |
国内免费 | 236篇 |
耳鼻咽喉 | 564篇 |
儿科学 | 1410篇 |
妇产科学 | 964篇 |
基础医学 | 6021篇 |
口腔科学 | 750篇 |
临床医学 | 4621篇 |
内科学 | 8060篇 |
皮肤病学 | 578篇 |
神经病学 | 4237篇 |
特种医学 | 1444篇 |
外国民族医学 | 1篇 |
外科学 | 6571篇 |
综合类 | 1131篇 |
一般理论 | 28篇 |
预防医学 | 5915篇 |
眼科学 | 1007篇 |
药学 | 2757篇 |
2篇 | |
中国医学 | 148篇 |
肿瘤学 | 3021篇 |
2023年 | 279篇 |
2022年 | 511篇 |
2021年 | 960篇 |
2020年 | 492篇 |
2019年 | 908篇 |
2018年 | 1106篇 |
2017年 | 774篇 |
2016年 | 799篇 |
2015年 | 944篇 |
2014年 | 1279篇 |
2013年 | 1944篇 |
2012年 | 2770篇 |
2011年 | 2780篇 |
2010年 | 1587篇 |
2009年 | 1386篇 |
2008年 | 2281篇 |
2007年 | 2339篇 |
2006年 | 2237篇 |
2005年 | 1982篇 |
2004年 | 1973篇 |
2003年 | 1858篇 |
2002年 | 1601篇 |
2001年 | 1235篇 |
2000年 | 1217篇 |
1999年 | 987篇 |
1998年 | 414篇 |
1997年 | 366篇 |
1996年 | 361篇 |
1995年 | 338篇 |
1994年 | 308篇 |
1993年 | 317篇 |
1992年 | 787篇 |
1991年 | 758篇 |
1990年 | 747篇 |
1989年 | 767篇 |
1988年 | 699篇 |
1987年 | 720篇 |
1986年 | 625篇 |
1985年 | 618篇 |
1984年 | 464篇 |
1983年 | 398篇 |
1982年 | 256篇 |
1981年 | 232篇 |
1980年 | 222篇 |
1979年 | 407篇 |
1978年 | 219篇 |
1977年 | 216篇 |
1976年 | 239篇 |
1974年 | 261篇 |
1973年 | 251篇 |
Objectives
The current study investigated the effects of two exercise interventions on cognitive function amongst breast cancer survivors.Design
Pilot randomised-controlled trial.Methods
Seventeen female cancer survivors (mean: 62.9 ± 7.8 years) were randomised into three groups: high-intensity interval training (HIIT, n = 6); moderate-intensity continuous training (MOD, n = 5); or wait-list control (CON, n = 6). The HIIT and MOD groups exercised on a cycle ergometer 3 days/week for 12-weeks. Primary outcomes were cognitive function assessments utilising CogState. Secondary outcomes were resting middle cerebral artery blood flow velocity, cerebrovascular reactivity and aerobic fitness (VO2peak). Data were analysed with General Linear Mixed Models and Cohen’s d effect sizes were calculated.Results
All 17 participants who were randomised were available for follow-up analysis and adherence was similar for HIIT and MOD (78.7 ± 13.2% vs 79.4 ± 12.0%; p = 0.93). Although there were no significant differences in the cognitive and cerebrovascular outcomes, HIIT produced moderate to large positive effects in comparison to MOD and CON for outcomes including episodic memory, working memory, executive function, cerebral blood flow and cerebrovascular reactivity. HIIT significantly increased VO2peak by 19.3% (d = 1.28) and MOD had a non-significant 5.6% (d = 0.72) increase, compared to CON which had a 2.6% decrease.Conclusions
This study provides preliminary evidence that HIIT may be an effective exercise intervention to improve cognitive performance, cerebrovascular function and aerobic fitness in breast cancer survivors. Considering the sample size is small, these results should be confirmed through larger clinical trials. 相似文献Methods: A cross-sectional prospective cohort study with 7-day follow-up was conducted. Body composition, cardiorespiratory fitness and biomarkers of cardiometabolic health were measured in thirty-three participants with SCI (> 1 year post injury). Physical activity dimensions were objectively assessed over 7-days.
Results: Activity energy expenditure (r =.43), physical activity level (r =.39), and moderate-to-vigorous physical activity (MVPA) (r =.48) were significantly (P < 0.001) associated with absolute (L/min) peak oxygen uptake (?O2 peak). ?O2 peak was significantly higher in persons performing ≥150 MVPA minutes/week compared to <40 minutes/week (P?=?0.003). Individual physical activity dimensions were not significantly associated with biomarkers of cardiometabolic health. However, body composition characteristics (BMI, waist and hip circumference) showed significant (P < 0.04), moderate (r >.30) associations with parameters of metabolic regulation, lipid profiles and inflammatory biomarkers. Relative ?O2 peak (ml/kg/min) was moderately associated with only insulin sensitivity (r?=?0.37, P?=?0.03).
Conclusions: Physical activity dimensions are associated with cardiorespiratory fitness; however, stronger and more consistent associations suggest that poor cardiometabolic health is associated with higher body fat content. Given these findings, the regulation of energy balance should be an important consideration for researchers and clinicians looking to improve cardiometabolic health in persons with SCI. 相似文献
Methods: Five semistructured interviews were used to explore the leisure experience of older people from metropolitan Adelaide. Data were coded and analysed thematically.
Results: Relaxation and engrossment emerged as commonly expressed experiences, yet were found to emerge as a result of engagement in occupations predefined as leisure. Experiences of freedom from both necessary duties and a sense of obligation were discussed as potential determinants of leisure consciousness.
Practice implications: This study highlights a need for therapists to actively access clients' subjective leisure experiences to enable engagement in personally meaningful leisure occupations. 相似文献
At clinical follow-up after a minimum of half a year, all of the patients who were not operated on had stable joints without signs of previous ligament ruptures.
Delayed physical examination at 5 days after the injury led to the highest overall sensitivity (96%) and specificity (84%) for the detection of a ligament rupture. Additional diagnostic procedures, at a considerable cost, yielded little additional information. 相似文献