The relationship between peak height velocity and physical performance in youth soccer players   总被引：1，自引：1，他引：0  

Philippaerts RM  Vaeyens R  Janssens M  Van Renterghem B  Matthys D  Craen R  Bourgois J  Vrijens J  Beunen G  Malina RM 《Journal of sports sciences》2006,24(3):221-230

Longitudinal changes in height, weight and physical performance were studied in 33 Flemish male youth soccer players from the Ghent Youth Soccer Project. The players' ages at the start of the study ranged from 10.4 to 13.7 years, with a mean age of 12.2 +/- 0.7 years. Longitudinal changes were studied over a 5 year period. Peak height velocity and peak weight velocity were determined using non-smoothed polynomials. The estimations of peak height velocity, peak weight velocity and age at peak height velocity were 9.7 +/- 1.5 cm x year-1, 8.4 +/- 3.0 kg x year-1 and 13.8 +/- 0.8 years, respectively. Peak weight velocity occurred, on average, at the same age as peak height velocity. Balance, speed of limb movement, trunk strength, upper-body muscular endurance, explosive strength, running speed and agility, cardiorespiratory endurance and anaerobic capacity showed peak development at peak height velocity. A plateau in the velocity curves was observed after peak height velocity for upper-body muscular endurance, explosive strength and running speed. Flexibility exhibited peak development during the tear after peak height velocity. Trainers and coaches should be aware of the individual characteristics of the adolescent growth spurt and the training load should also be individualized at this time.  相似文献   

Special populations: the female player and the youth player     

Rosenbloom CA  Loucks AB  Ekblom B 《Journal of sports sciences》2006,24(7):783-793

Females and youth are frequently described as "special" populations in football literature, but together these two populations outnumber male players. What makes females "special" is that they tend to eat less when training and competing than their male counterparts, leading to lower intakes of energy, carbohydrate, and some nutrients. Youth football players are special in regard to energy and nutrient requirements to promote growth and development, as well as to fuel sport. There is limited research on the dietary habits of these two populations, but the available literature suggests that many female and youth players need to increase carbohydrate intake, increase fluid intake, and develop dietary habits to sustain the demands of training and competition.  相似文献   

The angiogenetic effect of intramuscular administration of b-FGF and a-FGF on cardiac muscle: the influence of exercise on muscle angiogenesis     

Efthimiadou A  Asimakopoulos B  Nikolettos N  Giatromanolaki A  Sivridis E  Lialiaris TS  Papachristou DN  Kontoleon E 《Journal of sports sciences》2006,24(8):849-854

Although angiogenetic therapy using recombinant growth factors holds much hope for the treatment of ischaemic diseases, there are still many unanswered questions, including the method of administration, the correct dose of these factors, and the duration of the therapeutic approach. Exercise has also been suggested to induce neovascularizaiton in muscles. We evaluated the angiogenetic effects of the intramuscular administration of basic-fibroblast growth factor (b-FGF) and acidic-fibroblast growth factor (a-FGF) in rat heart, compared with rats who exercised daily. In conclusion, both the intramuscular administration of b-FGF and exercise increased significantly angiogenesis in the heart in contrast to the intramuscular administration of a-FGF, which was ineffective.  相似文献   

俄罗斯会出现“普京突破期”吗?     

弗亚切斯拉夫·科斯基科夫  胡雅娟 《对外大传播》2006,(1)

俄罗斯《论据与事实》 2005年12月7日文章很多读者都很想知道,俄罗斯现政府能否在历史上留下属于自己的一笔。俄罗斯有这样一个传统,就是总喜欢把各个历史时期以领导者的名字来命名。我们经常说到的有“列宁电气化时期”,“斯大林个人崇拜时期”,“赫鲁晓夫解冻时期”,“勃列日涅夫停滞期”, “叶利钦膨胀时期”。“当弗·普京把政权交接给下一任  相似文献   

仰望忠诚     

保罗·詹尼斯  刘建新 《文化博览》2006,(12):38-39

城市的过街天桥上有一个乞丐。他不会弹琴,不会唱歌,甚至不会用粉笔在地上书写自己的悲惨遭遇。每天他只是蹲坐在护栏边,把头深深地埋进膝里,脚边放一个残破的铝盆儿。好在经过这个天桥的人很多,偶尔会有人把一两个硬币或零钞丢在他脚边的小盆儿里。夜幕降临的时候,乞丐会回到他的住处——城郊一个废弃的菜园。菜园被一圈稀疏的篱笆围着,里面有一个残破的  相似文献   

送别     

C·马丁 《大中专文苑》2005,(9)

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食物蛋白质——神话还是魔术?     

弗雷德里克·F·安德列斯  利萨·凯纳  黄汉升  黎耀东 《体育与科学》1985,(3)

在体育运动领域里是没有通往金牌的捷径的。献身精神、刻苦训练,良好的基因和有益于中康的饮食就是通往金牌的一切道路。 运动员所使用和误用的所有比赛辅助物中,蛋白质居于大多数误用物质的前列。迎合运动员及  相似文献   

2001年高校图书馆展望   总被引：2，自引：0，他引：2  

米·戈尔曼  张福学 《大学图书馆学报》1992,(6):56-58

本文从资金、馆舍/空间、馆藏及存取途径、人员四个主要方面思考了高校图书馆的前景;同时也研究了新技术与新载体的影响,认为变革对于2001年的高校图书馆来说,是一种必然的、有积极作用的力量。  相似文献   

职教应强化环保教育     

君德·瓦格纳 《职业技术》2006,(8):58

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论媒介监督   总被引：6，自引：0，他引：6  

V·怀特豪斯  雷跃捷  田智辉 《现代传播》2002,(1):53-55

那些监督新闻工作者、媒介组织及其道德行为规范的监督组织常常会被他们自身的价值观和工作章程所驱动 ,因此 ,这种价值观和工作章程要为理解其批评的目的所评估。在美国民主体制中 ,新闻记者所扮演的角色发展演变为包括作为政府部门的监督者。这意味着人们期待记者去调查民选的官员滥用普通民众的权利和自由。“对于新闻记者来说 ,通过调查报道来告知公众 ,揭露腐败和纠正错误 ,这是不言而喻的职责。”明尼苏达大学媒介伦理和法律教授珍妮伊凯在去年 10月出版的《哥伦比亚新闻评论》发表的一篇文章中如是说。不管怎么说 ,美国的新闻工作者…  相似文献