收费全文 | 81669篇 |
免费 | 4665篇 |
国内免费 | 193篇 |
耳鼻咽喉 | 1054篇 |
儿科学 | 1909篇 |
妇产科学 | 1620篇 |
基础医学 | 10980篇 |
口腔科学 | 3032篇 |
临床医学 | 6229篇 |
内科学 | 20016篇 |
皮肤病学 | 1890篇 |
神经病学 | 7231篇 |
特种医学 | 1921篇 |
外国民族医学 | 2篇 |
外科学 | 11129篇 |
综合类 | 370篇 |
一般理论 | 28篇 |
预防医学 | 7207篇 |
眼科学 | 1582篇 |
药学 | 5441篇 |
中国医学 | 310篇 |
肿瘤学 | 4576篇 |
2023年 | 539篇 |
2022年 | 290篇 |
2021年 | 1326篇 |
2020年 | 842篇 |
2019年 | 1432篇 |
2018年 | 2588篇 |
2017年 | 1552篇 |
2016年 | 1636篇 |
2015年 | 2350篇 |
2014年 | 2442篇 |
2013年 | 3551篇 |
2012年 | 6991篇 |
2011年 | 7053篇 |
2010年 | 3191篇 |
2009年 | 2342篇 |
2008年 | 6011篇 |
2007年 | 6134篇 |
2006年 | 6246篇 |
2005年 | 5956篇 |
2004年 | 5436篇 |
2003年 | 4888篇 |
2002年 | 4662篇 |
2001年 | 1716篇 |
2000年 | 2246篇 |
1999年 | 1163篇 |
1998年 | 273篇 |
1997年 | 192篇 |
1996年 | 200篇 |
1995年 | 180篇 |
1994年 | 142篇 |
1993年 | 145篇 |
1992年 | 235篇 |
1991年 | 214篇 |
1990年 | 176篇 |
1989年 | 172篇 |
1988年 | 135篇 |
1987年 | 128篇 |
1986年 | 141篇 |
1985年 | 141篇 |
1984年 | 152篇 |
1983年 | 105篇 |
1982年 | 109篇 |
1981年 | 86篇 |
1980年 | 103篇 |
1979年 | 89篇 |
1978年 | 80篇 |
1977年 | 60篇 |
1976年 | 63篇 |
1974年 | 59篇 |
1973年 | 59篇 |
The exercise pressor reflex is a feedback mechanism engaged upon stimulation of mechano- and metabosensitive skeletal muscle afferents. Activation of these afferents elicits a reflex increase in heart rate, blood pressure, and ventilation in an intensity-dependent manner. Consequently, the exercise pressor reflex has been postulated to be one of the principal mediators of the cardiorespiratory responses to exercise. In this updated review, we will discuss classical and recent advancements in our understating of the exercise pressor reflex function in both human and animal models. Particular attention will be paid to the afferent mechanisms and pathways involved during its activation, its effects on different target organs, its potential role in the abnormal cardiovascular response to exercise in diseased states, and the impact of age and biological sex on these responses. Finally, we will highlight some unanswered questions in the literature that may inspire future investigations in the field.
相似文献Objective: The aim of this study was to identify whether gait speed is a predictor of CM and QoL in patients with stroke following a multimodal rehabilitation program (MRP).
Methods: This was a baseline control trial with 6-months follow-up in an outpatient rehabilitation setting at a university hospital. Twenty-six stroke survivors completed the MRP (24 sessions, 2 days/wk, 1 hr/session). The MRP consisted of aerobic exercise, task-oriented exercises, balance exercises and stretching. Participants also performed an ambulation program at home. Outcome variables were: walking speed (10-m walking test) and QoL (physical and psychosocial domains of Euroquol and Sickness Impact Profile).
Results: At the end of the intervention, comfortable and fast walking speed increased by an average of 0.16 (SD 0.21) (*p < .05) and 0.40 (SD 0.51) (**p < .001) m/s, respectively. After the intervention, all participants achieved independent outdoor ambulation with an increase of 34.14 of walking minutes/day in the community and a decrease of sitting time of 95.45 minutes/day. Regarding QoL there were increased mean scores on the physical and psychosocial dimensions of Euroquol and the Sickness Impact Profile, respectively (**p < .001).
Conclusions: The results suggest that improved walking speed after the MRP is associated with CM and higher scores in QoL. These findings support the need to implement rehabilitation programs to promote increased speed. 相似文献