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221.
为我国自由式滑雪空中技巧训练体系的完善和为备战2018年韩国平昌冬奥会专项体能训练,采用文献资料法、数理统计法和实证法等研究方法对自由式滑雪空中技巧运动员专项力量的训练进行了应用性研究,研究根据空中技巧项目规律、技术特征及运动员的个体特点,在备战过程中设计和实施了有针对性、实效性的专项力量训练方法、训练计划,并有效地把握了整个训练过程的力量负荷安排。2013年度专项力量训练应用的结果表明:不仅使运动员的专项运动能力逐渐达到了赛前最佳的竞技状态,而且使运动损伤得到有效的降低,并使受伤运动员得到了有效的康复。 相似文献
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223.
《European Journal of Sport Science》2013,13(6):578-585
AbstractThe main purpose of the present study was to investigate the effect of 16 weeks of resistance training (RT) on body water in men and women. Thirty men (22.7 ± 4.4 years, 68.4 ± 9.0 kg and 174.5 ± 6.6 cm) and 34 women (22.7 ± 4.1 years, 58.8 ± 11.9 kg and 162.6 ± 6.2 cm) underwent progressive RT for 16 weeks (2 phases, 8 weeks each), 3 times per week, that consisted of 10–12 whole body exercises with 3 sets of 8–12 repetitions maximum. Total body water, TBW (intracellular water, ICW and extracellular water, ECW compartments) and skeletal muscle mass (SMM) were assessed using a spectral bioelectrical impedance device (Xitron 4200 Bioimpedance Spectrum Analyzer). TBW, ICW compartment and SMM increased significantly (P < 0.05) over time in men (+7.5%, +8.2% and +4.2%, respectively) and women (+7.6%, +11.0% +3.9%, respectively), with no sex by time interaction (P > 0.05). We conclude that progressive RT promotes an increase in body water, principally by intracellular content; however, the hydration status is not influenced by sex. 相似文献
224.
通过对拉弧圈球过程的动力学分析,得出:拉对方的下旋来球比拉对方的上旋来球需要更大的切向挥拍速度,且来球下旋越强烈,切向挥拍速度要求越高,才能拉出弧圈球;为达到拉球的最佳效果,拉对方的上旋来球比拉对方的下旋来球所需较长的摩擦时间,且来球上旋越强烈,所需时间越长;拉对方下旋来球比拉对方上旋来球,回球的旋转效果更好,对方来球下旋越强烈,回球旋转也越强;拉对方上旋来球比拉对方下旋来球,回球更容易过网,且对方上旋越强烈,越容易过网,但要防止拉出台。 相似文献
225.
Jan Taeymans Peter Clarys Hassane Abidi Marcel Hebbelinck William Duquet 《Journal of sports sciences》2013,31(8):833-841
Abstract This longitudinal study analyses the development and predictability of static strength and their interactions with maturation in youth. Of 515 children followed annually from age 6 to 18 years, 59 males and 60 females were measured again at age 35. Early, average, and late maturity groups were established. Body height and mass were assessed. Static strength was measured using handgrip dynamometry. Pearson correlations were used as tracking coefficients. From 6 to 12 years of age, no static strength differences were found to exist between the maturity groups of both sexes. Static strength is significantly higher in early than in average and late maturing boys (age 13–16). In girls, a dose–response effect exists (age 11–14). Adult static strength predictability is low in early maturing boys and late maturing girls. It is moderate to high (50–76%) in the other maturity groups up to age 14. Predictors for adult static strength are childhood and adolescent handgrip dynamometry (in females only), medicine ball throw, sit-up, hockey ball throw, and 25-m sprint. Handgrip is a fair predictor of adult static strength at most ages in early and average maturing females; in average maturing males, it is a predictor at age 11. Other indicators of strength (e.g. hockey ball throw) are predictors in males. 相似文献
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227.
Abstract The purpose of this study was to compare changes in aerobic condition, strength, and muscular endurance following 8 weeks of endurance rowing alone or in combination with weight-training. Twenty-two elite rowers were assigned to (1) rowing (n = 10, 250–270 km · week?1) or (2) rowing (n = 12, 190–210 km · week?1) plus four weight-training sessions each week. Pre and post mean and standardized effect-size (ES) differences in aerobic condition (watts at 4 mmol · L?1) and strength (isometric pull, N), prone bench-pull (6-repetition maximum, 6-RM), 5- and 30-repetition leg-press and 60-repetition seated-arm-pull (J, performed on a dynamometer) normalized by body mass and log-transformed were analysed, after adjusting for gender. The standardized differences between groups were trivial for aerobic condition (ES [±90% CI] = 0.15; ±0.28, P = 0.37) and prone bench-pull (ES = 0.27; ±0.33, P = 0.18), although a moderate positive benefit in favour of rowing only was observed for the seated-arm-pull (ES = 0.42; ±0.4, P = 0.08). Only the weight-training group improved isometric pull (12.4 ± 8.9%, P < 0.01), 5-repetition (4.0 ± 5.7%, P < 0.01) and 30-repetition (2.4 ± 5.4%, P < 0.01) leg-press. In conclusion, while gains in aerobic condition and upper-body strength were comparable to extensive endurance rowing, weight-training led to moderately greater lower-body muscular-endurance and strength gains. 相似文献
228.
Fourteen elite and 14 amateur athletes were subjected to vibratory stimulation during bilateral biceps curl exercises of explosive strength exertion. The athletes performed two separate series of three sets of exercises in random order. The second set of one series was administered with superimposed vibration of 44 Hz and an acceleration of about 30 m .s-2 transmitted through the two-arms handle to the arm muscles. The mechanical power of each repetition was measured by the ‘Power Teach’ instrument. The maximal and mean power values for each set were automatically recorded and shown on the screen. The acute effect was evaluated as the difference between the mean and peak power output in the second (with vibratory stimulation) and first (without vibratory stimulation) sets. Similarly, the residual effect was taken to be the difference between the power values of the third (after vibratory stimulation) and the first (before vibratory stimulation) sets. The results were subjected to a repeated-measures analysis of variance with group as a between-participants factor. The results showed that exercise mode (with vs without vibratory stimulation) resulted in a significant immediate effect for mean power and for maximal power. The factor group (elite vs amateurs) resulted in a significant effect for maximal power only. The increase in explosive strength exertion attributed to vibratory stimulation was 30.1 and 29.8 W (10.4% and 10.2%) for maximal and mean power respectively in the elite group, and 20.0 and 25.9 W (7.9% and 10.7%) respectively in the amateur athletes. Vibratory stimulation resulted in an insignificant residual effect. 相似文献
229.
运用文献资料法、数理统计法、对比分析法,以历届世界少年田径锦标赛、第7-13届世界青年田径锦标赛、第7-13届世界田径锦标赛我国运动员奖牌获得项目为依据,借鉴经济学评价系统态势的方法,对我国三个不同年龄阶段运动员竞技实力进行系统对比分析。结果表明,我国成年与青少年竞技实力悬殊且男女子差距明显,奖牌积分呈动态变化,优势厚度分明,项目传承无连续性。完善竞赛体系,科学的选材,有效的"体教结合",杜绝训练早期专项化,延长运动员运动寿命,寻找一条一体化的科学训练模式,是我国竞技田径可持续发展的有益对策。 相似文献
230.
次贷危机是美国霸权危机 总被引:1,自引:0,他引:1
江涌 《北京城市学院学报》2008,(6)
本文从分析美国维护全球霸权的四大支柱入手,阐述了次贷危机不仅重创美国的金融服务业,而且必然严重损伤实体经济,严重挫伤投资者与消费者的信心以及投资与消费能力,必然伤害美国的经济活力的道理。推断因此必然导致美国的硬实力与软实力均遭受重挫,最后提出,次贷危机是美国霸权的危机,并认为面对历史上惯于过河拆桥、落井下石的美国,明智之举是保持距离。 相似文献