Physical activity among Spanish adolescents: relationship with their relatives' physical activity - the AVENA study     

Martin-Matillas M  Ortega FB  Chillon P  Perez IJ  Ruiz JR  Castillo R  Gomez-Martinez S  Moreno LA  Delgado-Fernandez M  Tercedor P;AVENA Study 《Journal of sports sciences》2011,29(4):329-336

Identifying factors related to physical activity levels in young people is important for a more efficient health promotion. The aims of this study were to assess physical activity levels in a national sample of urban Spanish adolescents, and to examine the association between significant others' physical activity (father, mother, brother, sister, and close friends) and that of the adolescents. The present study comprised 2260 adolescents (1157 boys, 1103 girls) aged 13.0-18.5 years participating in the AVENA Study. Both the adolescents' physical activity and that of their relatives and close friends was assessed by questionnaire. The odds of being active were higher in boys than girls (odds ratio?=?2.79, 95% confidence interval?=?2.34-3.33) and tended to decrease across age groups in both boys and girls. Father's and older brother's physical activity was associated with boys' physical activity, while that of any significant other was associated with girls' physical activity. When both parents reported being active, boys had nearly two times higher odds of being active and girls had nearly three times higher odds of being active. The physical activity levels of Spanish adolescents are in line with those previously reported. Physical activity levels in girls are strongly related to the physical activity of any significant other, whereas physical activity levels in boys are only related to their male relatives' physical activity.  相似文献   

对高水平乒乓球运动员腿部爆发力和弹跳力的评价     

Francisco Pradas　Carlos de Teresa　Maricarmen Vargas 《体育科研》2005,26(3):80-85

乒乓球运动是一项非周期性运动,对抗过程中涉及极其复杂的战术、心理和生理因素,球员面对对手的施压需要做出快速反应,其中速度和爆发力是基本的、必备的素质.研究目的探讨乒乓球运动员腿部爆发力的重要作用.研究方法本研究选用29名优秀运动员为实验对象,其中包括17名男性(年龄23.5±5.5岁)和12位女性(年龄20.8±2.9岁),均为西班牙国家乒乓球队成员.采用测力台(Ergotester Globus)、Acer笔记本电脑和一些登记册对运动员进行了全蹲跳(CMJ)和半蹲跳(SJ)测试,并对腿部爆发力和弹跳力进行了评价.实验数据的统计处理由SPSS v12.0和Excel v 10.2软件完成.研究结果在腿部爆发力和弹跳力方面,男女组存在显著性差异(p＜0.001),男运动员优于女性运动员.同样,不同打法的选手之间也存在差异,防守型打法的选手都低于进攻型选手.讨论和结论在CMJ和SJ测试中,防守型打法的选手腿部爆发力和弹跳力均低于进攻型选手.在实验中成绩较好的男女选手,排名均在西班牙前十二以内,进一步证实了腿部爆发力在此项运动中的重要性,尤其对进攻型打法的选手.其原因可归结为血液中所含睾丸激素水平的高低,男选手高于女选手,进攻型选手高于防守型.  相似文献   

Tournament structure and nations' success in women's professional tennis   总被引：1，自引：1，他引：0  

Reid M  Crespo M  Atienza F  Dimmock J 《Journal of sports sciences》2007,25(11):1221-1228

The relationship between domestic professional tournament structure in women's tennis and the subsequent professional ranking success of a nation's female players is examined. The 2003 women's professional tennis tournament calendar provided the distribution of events in 33 countries. Criteria used to classify nations' success in women's professional tennis were as follows: number of players with Women's Tennis Association (WTA) points, number of players with Top 200 rankings, and the combined WTA ranking of a nation's Top 5 female players. Pearson product - moment correlations were performed between the number of tournaments and the three criteria. Considerable variation was observed in the number of events organized between nations (USA, n = 56; Thailand, n = 3). All countries had internationally ranked female players, and 24 nations had players ranked in the Top 200. Results revealed relationships between a nation's number of women's professional events and both that nation's number of professionally ranked players (r = 0.60; P < 0.01) and Top 200 players (r = 0.60; P < 0.01), as well as the combined ranking of their Top 5 players (r = -0.52; P < 0.01). While a similar association was found between the number of professional events and players ranked in the men's game, there was no significant correlation between events held and the combined standing of nations' best five ranked players. Governing bodies and national associations in tennis should consider the provision of professional, domestic competition as key to the development of female tennis players.  相似文献   

Mark Twain and the “Slow,Poor, Shiftless,Sleepy, and Lazy” Azoreans in The Innocents Abroad     

Reinaldo Francisco Silva 《Journal of American culture (Malden, Mass. : 2003)》2003,26(1):17-23

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Editor's note     

Francisco Cano  María Cardelle-Elawar 《Educational Psychology Review》1992,4(1):1-1

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Conservation of a mural in the Mandarin's House,Macao     

Roy Kaisin Sit  Francisco Chileong Chan  Manfong Lei 《文物保护研究》2014,59(5):S264-S265

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A phenomenology of learning large: the tutorial sphere of xMOOC video lectures     

Catherine Adams  Yin Yin  Luis Francisco Vargas Madriz  C. Scott Mullen 《Distance Education》2014,35(2):202-216

The current discourse surrounding Massive Open Online Courses (MOOCs) is powerful. Despite their rapid and widespread deployment, research has yet to confirm or refute some of the bold claims rationalizing the popularity and efficacy of these large-scale virtual learning environments. Also, MOOCs’ reputed disruptive, game-changing potential for education remains unsubstantiated. A sober counterbalance is needed, in particular, via attending to students’ everyday accounts of the complex realities of learning in these massive online courses. This article reports on an exploratory, phenomenological study of the xMOOC learning experience. Our interest was not the xMOOC experience of students in general, but in its singular, lived particularities. What we discovered was a unique and intimate tutorial sphere that seemed to develop for some xMOOC students in the context of the video lectures, an experience sometimes marked by a sense of fandom surround.  相似文献   

The role of positive peer interactions and English exposure in Spanish-speaking preschoolers’ English vocabulary and letter-word skills     

Francisco Palermo  Ariana M. Mikulski 《Early childhood research quarterly》2014

We examined the extent to which positive interactions with peers and the amount of English exposure received from them during social interactions in the fall of preschool contributed to low-income Spanish-speaking children's (N = 107; M_age = 53 months; SD = 4.30 months; 56% boys) English vocabulary and letter-word skills in the spring (controlling for parents’ language use, family income, number of English books at home, and children's nonverbal cognitive abilities). We also examined the mediating roles of children's learning behaviors (e.g., attentiveness, independence, initiative, persistence, and participation) and English oral proficiency in the classroom. The association between positive peer interactions and English vocabulary skills was mediated by children's English oral proficiency, whereas the association between positive peer interactions and English letter-word skills was mediated by children's learning behaviors and English oral proficiency. The associations among peer English exposure and children's English vocabulary and letter-word skills were mediated by children's English oral proficiency. There was also evidence of a transactional association between positive peer interactions and children's learning behaviors and between peers’ and children's English oral proficiency. The findings highlight the importance of peer experiences in fostering Spanish-speaking preschoolers’ English vocabulary and letter-word skills.  相似文献   

Information literacy: perceptions of Brazilian HIV/AIDS researchers     

Maria do Carmo Avamilano Alvarez  Ivan França Junior  Angela Maria Belloni Cuenca  Francisco I. Bastos  Helene Mariko Ueno  Cláudia Renata Barros  Maria Cristina Soares Guimarães 《Health information and libraries journal》2014,31(1):64-74

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On Our Own: Starting an Interlibrary Loan Service From Scratch     

Maria C. Melssen  Francisco Fajardo 《Journal of Interlibrary Loan, Document Delivery & Electronic Reserve》2013,23(4):185-192

In August 2009, the Herbert Wertheim College of Medicine Medical Library opened its doors to students, faculty, and staff. One of the many challenges before opening the library was developing a unique and autonomous interlibrary loan service for its patrons. This article examines the decisions in choosing the best document delivery system, the management of funds, and the selection of holdings for a new medical library. Along with these decisions, there is discussion on the significance of costs, turnaround times, and challenges going forward.  相似文献