Dribbling determinants in sub-elite youth soccer players     

Matteo Zago  Andrea Gianluca Piovan  Isabella Annoni  Daniela Ciprandi  F. Marcello Iaia 《Journal of sports sciences》2016,34(5):411-419

Dribbling speed in soccer is considered critical to the outcome of the game and can assist in the talent identification process. However, little is known about the biomechanics of this skill. By means of a motion capture system, we aimed to quantitatively investigate the determinants of effective dribbling skill in a group of 10 Under-13 sub-elite players, divided by the median-split technique according to their dribbling test time (faster and slower groups). Foot-ball contacts cadence, centre of mass (CoM), ranges of motion (RoM), velocity and acceleration, as well as stride length, cadence and variability were computed. Hip and knee joint RoMs were also considered. Faster players, as compared to slower players, showed a 30% higher foot-ball cadence (3.0 ± 0.1 vs. 2.3 ± 0.2 contacts · s^?1, P < 0.01); reduced CoM mediolateral (0.91 ± 0.05 vs. 1.14 ± 0.16 m, P < 0.05) and vertical (0.19 ± 0.01 vs. 0.25 ± 0.03 m, P < 0.05) RoMs; higher right stride cadence (+20%, P < 0.05) with lower variability (P < 0.05); reduced hip and knee flexion RoMs (P < 0.05). In conclusion, faster players are able to run with the ball through a shorter path in a more economical way. To effectively develop dribbling skill, coaches are encouraged to design specific practices where high stride frequency and narrow run trajectories are required.  相似文献   

Effects of high-intensity interval training on cardiometabolic risk factors in overweight/obese women     

Abbie E. Smith-Ryan  Eric T. Trexler  Hailee L. Wingfield  Malia N.M. Blue 《Journal of sports sciences》2016,34(21):2038-2046

The purpose of this study was to evaluate two practical interval training protocols on cardiorespiratory fitness, lipids and body composition in overweight/obese women. Thirty women (mean ± SD; weight: 88.1 ± 15.9 kg; BMI: 32.0 ± 6.0 kg · m²) were randomly assigned to ten 1-min high-intensity intervals (90%VO₂ peak, 1 min recovery) or five 2-min high-intensity intervals (80–100% VO₂ peak, 1 min recovery) or control. Peak oxygen uptake (VO₂ peak), peak power output (PPO), body composition and fasting blood lipids were evaluated before and after 3 weeks of training, completed 3 days per week. Results from ANCOVA analyses demonstrated no significant training group differences for any primary variables (P > 0.05). When training groups were collapsed, 1MIN and 2MIN resulted in a significant increase in PPO (?18.9 ± 8.5 watts; P = 0.014) and time to exhaustion (?55.1 ± 16.4 s; P = 0.001); non-significant increase in VO₂ peak (?2.36 ± 1.34 ml · kg^?1 · min^?1; P = 0.185); and a significant decrease in fat mass (FM) (??1.96 ± 0.99 kg; P = 0.011). Short-term interval exercise training may be effective for decreasing FM and improving exercise tolerance in overweight and obese women.  相似文献   

八段锦竞赛功法对大学生机体自由基代谢和身体形态影响的研究     

李秋平  刘毅  彭婵  陈阳阳  任建立 《湖北体育科技》2016,(5)

目的:探索健身气功·八段锦(竞赛功法)对大学生机体自由基代谢和身体形态的影响。方法:主要采用实验法,随机抽取2014级康保系男生和女生各20人,持续进行4个月的功法习练,观察血脂和生理机能的变化。结果:大学生经过4个月的功法习练后,3个时间点测试SOD、CAT和大腿围指标呈上升趋势,MDA、XOD和腰臀比指标呈下降趋势,差异具有统计学意义;测试体重、体重指数和大臂围3项指标没有显著性差异。结论:健身气功·八段锦(竞赛功法)对大学生机体脏腑、固肾壮腰、提振精神、防治疲劳、改善血液循环、提高腰腹柔韧和腿部力量等方面有重要帮助。  相似文献   

冬泳运动对中老年人身体成分的影响分析     

姜燕  武俸羽 《辽宁体育科技》2016,(1):75-77

对齐齐哈尔市冬泳协会的116名冬泳爱好者进行身体成分测试。结果显示：长期进行冬泳运动,可以改善中老年人的身体成分,降低体脂百分比和肥胖发生率,提高身体素质,对预防心血管疾病及老年性骨质疏松具有积极意义。  相似文献   

浅谈女子竞技健美操力量训练方法   总被引：2，自引：0，他引：2  

徐胜 《广东技术师范学院学报》2004,(6):108-110

竞技健美操对力量素质的要求越来越高 ,它已成为决定运动成绩的主要因素之一 ,本文就女子竞技健美操运动员在力量训练中手段的选择以及上肢力量、下肢力量、腰腹力量训练的方法和注意事项进行了论述 .  相似文献   

基于VBA的图文混排题库系统的建立   总被引：2，自引：0，他引：2  

王延涛  王艳辉 《通化师范学院学报》2004,25(2):36-38

基于Visual Basic for Applications(VBA)发展了一种新型题库系统，使题库的录入、抽题、试卷生成均在Word下进行，很好地解决了图混排问题，同时给题库程序开发人员和用户提供了一个更为方便、快捷的界面，是一种很有前途的题库系统。  相似文献   

论音乐在健美操中的功效及其创编   总被引：1，自引：0，他引：1  

周慧 《湖南科技学院学报》2006,27(3):292-294

在健美操教学训练和比赛中，音乐贯穿始终，音乐与健美操的有机联系，音乐与动作的和谐，音乐的风格与动作的风格一致性。以及创编音乐充分体现健美操健、力、美的特点，强调美与力的结合，音乐旋律的动听，力求新颖，富于变化，节奏鲜明、强劲、规整，速度适中，音乐衬托动作，动作表现音乐，使动作与音乐水乳交融．完美结合。  相似文献   

Body composition of female road and track endurance cyclists: Normative values and typical changes     

Eric C. Haakonssen  Martin Barras  Louise M. Burke  David G. Jenkins  David T. Martin 《European Journal of Sport Science》2016,16(6):645-653

The aims of this study were to describe normative values and seasonal variation of body composition in female cyclists comparing female road and track endurance cyclists, and to validate the use of anthropometry to monitor lean mass changes. Anthropometric profiles (seven site skinfolds) were measured over 16 years from 126 female cyclists. Lean mass index (LMI) was calculated as body weight?×?skinfolds^?x. The exponent (x) was calculated as the slope of the natural logarithm of body weight and skinfolds. Percentage changes in LMI were compared to lean mass changes measured using dual-energy X-ray absorptiometry (DXA) in a subset of 25 road cyclists. Compared to sub-elite and elite cyclists, world class cyclists were (mean [95% CI]) 1.18?kg [0.46, 1.90] and 0.60?kg [0.05, 1.15] lighter and had skinfolds that were 7.4?mm [3.8, 11.0] and 4.6?mm [1.8, 7.4] lower, respectively. Body weight (0.41?kg [0.04, 0.77]) and skinfolds (4.0?mm [2.1, 6.0]) were higher in the off-season compared to the early-season. World class female road cyclists had lower body weight (6.04?kg [2.73, 9.35]) and skinfolds (11.5?mm [1.1, 21.9]) than track endurance cyclists. LMI (mean exponent 0.15 [0.13, 0.18]) explained 87% of the variance in DXA lean mass. In conclusion, higher performing female cyclists were lighter and leaner than their less successful peers, road cyclists were lighter and leaner than track endurance cyclists, and weight and skinfolds were lowest early in the season. LMI appears to be a reasonably valid tool for monitoring lean mass changes.  相似文献   

研究生公选课程分组讨论教学的规则设计、组织与有效实施 ——澳大利亚新南威尔士大学(UNSW)研究生公选课程教学经验的借鉴     

蒋辉宇 《安庆师范学院学报(社会科学版)》2019,38(4):114-120

澳大利亚新南威尔士大学的教师通过对学生循环提问与交叉提问的方式,事实上组织起了一场以研究生个人为参与主体的课堂讨论,该课堂讨论通过对研究生讨论表现实时计分的方式凝聚了学生课堂注意力,同时也有效控制了讨论秩序,其教学经验值得我国借鉴。然而,由于两国研究生公选课程人数及国民性格的较大差异,澳洲的教学经验不能在国内同类课堂完全直接适用。有必要进行针对性改造、变通。在改造后的分组讨论模式中,由教师实时记录各讨论小组的发言、提问及评论质量,并通过科学的分数构成及相关规则将各小组成员的个人总评成绩进行具体量化,同时通过小组内部及小组之间的双重竞争机制有效保障研究生个人持续性积极参与分组讨论的全部环节。  相似文献   

学校经营的主体     

周游 《复旦教育论坛》2003,1(5):22-25

学校是人才产品的基地，要顺利实现人才产品的生产经营，我们应该关注学校经营的主体，特别是学校经营的产权主体、经营主体、服务主体、消费主体、利益主体等，对其深入研究，明确认识，把握本质，这将有利于我国教育市场的开放和学校教育的健康发展。  相似文献