Does modality matter? A latent profile and transition analysis of sedentary behaviours among school-aged youth: The UP&DOWN study     

David Sánchez-Oliva  Rebecca M. Leech  Alberto Grao-Cruces  Irene Esteban-Cornejo  Carmen Padilla-Moledo  Oscar L. Veiga 《Journal of sports sciences》2020,38(9):1062-1069

ABSTRACT

The aims of this study were to identify profiles of sedentary behaviour (SB) patterns, based on leisure-time self-reported SB modalities (screen, educative, social, and relaxing) and to evaluate changes in these profiles over 2 years among Spanish youth aged 8–18 years. Latent profile analysis (LPA), a data-driven analytic approach, was used to identify groups of boys and girls (n = 1553; 48% girls; mean±SD age: 12.56 ± 2.49 y) with distinct SB profiles using the SB modalities (time/d) as input variables. Latent transition analysis, an extension of LPA that uses longitudinal data, was used to analyse 2-year changes in these profiles. At baseline, four and three SB profiles were found among boys (labelled: screen, educative, social, and relaxing) and girls (labelled: screen/social, educative, and relaxing), respectively. Overall, more girls (range: 48%-67%) had the same profile over time, than boys (40%-52%). Participants with a screen or relaxing SB profile at baseline were more likely to have an educative profile after 2 years. Youth with a social and an educative SB profile at baseline were more likely to transition to profiles characterized by higher screen and social SB, respectively. Using a novel and person-centered approach, this study identified gender-specific SB profiles that were moderately stable over time.  相似文献   

Quality flaw prediction in Spanish Wikipedia: A case of study with verifiability flaws     

Edgardo Ferretti  Leticia Cagnina  Viviana Paiz  Sebastián Delle Donne  Rodrigo Zacagnini  Marcelo Errecalde 《Information processing & management》2018,54(6):1169-1181

In this work, we present the first quality flaw prediction study for articles containing the two most frequent verifiability flaws in Spanish Wikipedia: articles which do not cite any references or sources at all (denominated Unreferenced) and articles that need additional citations for verification (so-called Refimprove). Based on the underlying characteristics of each flaw, different state-of-the-art approaches were evaluated. For articles not citing any references, a well-established rule-based approach was evaluated and interesting findings show that some of them suffer from Refimprove flaw instead. Likewise, for articles that need additional citations for verification, the well-known PU learning and one-class classification approaches were evaluated. Besides, new methods were compared and a new feature was also proposed to model this latter flaw. The results showed that new methods such as under-bagged decision trees with sum or majority voting rules, biased-SVM, and centroid-based balanced SVM, perform best in comparison with the ones previously published.  相似文献   

TAM and stages of adoption of blended learning in higher education by application of data mining techniques     

Antonio Víctor Martín-García  Fernando Martínez-Abad  David Reyes-González 《British journal of educational technology : journal of the Council for Educational Technology》2019,50(5):2484-2500

  相似文献   

美国国家橄榄球联盟(NFL)的发展进程及启示   总被引：1，自引：0，他引：1  

李卫平  米靖  李晓明  苗向军 《北京体育大学学报》2006,29(12):1719-1721

通过回顾美国国家橄榄球联盟的发展历程,梳理其发展脉络,总结和归纳出:与个人项目相比,集体性的橄榄球项目有着更为旺盛的人气和宽广的市场前景;业余体育是职业体育的人才基础和保障;崇尚自由和个人英雄主义是橄榄球项目在美国蓬勃发展的价值与文化基础;高质量的竞赛产品与灵活的销售策略是NFL发展的原动力及赛场表现与传播渠道的完美结合为NFL的发展提供了展示的空间和平台等发展启示,以此为我国职业体育的发展提供可借鉴的思路.  相似文献   

论高校大学生就业指导中的"全员观指导"和"全程观指导"   总被引：2，自引：0，他引：2  

糜志雄 《苏州市职业大学学报》2004,15(1):82-83

随着社会经济的发展和高校招生规模的扩大，就业形势越来越严峻。传统的就业指导主要侧重于为临近毕业的学生做好就业服务工作，这种就业指导的模式已经不适应形势的发展。高校大学生就业指导中应当树立全员观和全程观，把为毕业生进行“包装”的做法改成为学生进行“设计”，全面提高就业指导工作的科学性和前瞻性。  相似文献   

Introduction: Scientific and Technological Textbooks in the European Periphery     

José Ramón Bertomeu-sánchez  Antonio García-Belmar  Anders Lundgren  Manolis Patiniotis 《Science & Education》2006,15(7-8):657-665

  相似文献   

运动训练对大鼠心肌细胞一氧化氮合酶表达的影响   总被引：1，自引：0，他引：1  

刘永涛  米春娟  田振军 《北京体育大学学报》2006,29(11):1501-1502,1515

为了研究不同强度训练对大鼠心肌细胞一氧化氮合酶表达的影响,采用跑台训练方式,建立大鼠有氧运动和疲劳运动模型,运用免疫组织化学技术研究心肌细胞nNOS、eNOS和iNOS表达的变化.结果发现:有氧训练和大强度训练组大鼠心肌细胞 nNOS阳性表达显著高于安静对照组;有氧训练和大强度训练组大鼠心肌细胞iNOS 阳性表达也显著高于安静对照组,并且有氧训练组大鼠心肌细胞的iNOS阳性表达显著高于大强度训练组;有氧训练大鼠心肌细胞eNOS的阳性表达极显著高于安静对照组和大强度训练组,而对照组则高于大强度训练组.提示心肌细胞一氧化氮合酶表达的变化与运动强度有显著关系.  相似文献   

优秀花剑运动员专项体能特点的研究     

米卫国  许以诚  金贇 《体育科研》2004,25(4):43-45

通过专家访谈和统计法对我国优秀花剑运动员的体能特点进行研究,结果显示:我国优秀花剑运动员在比赛中,运动强度方面表现出显著的波动性和间歇性特点,在安排训练时,应体现强度高、低结合类间歇性练习方法,练习的时间结构上也应体现间歇性和多样性。  相似文献   

Reading Progress Monitoring for Secondary‐School Students: Reliability,Validity, and Sensitivity to Growth of Reading‐Aloud and Maze‐Selection Measures     

Renáta Tichá  Christine A. Espin  Miya Miura Wayman 《Learning disabilities research & practice》2009,24(3):132-142

The validity and reliability of curriculum‐based measures in reading as indicators of performance and progress for secondary‐school students were examined. Thirty‐five grade 8 students completed reading aloud and maze‐selection measures weekly for 10 weeks. Criterion measures were the state standards test in reading and the Woodcock–Johnson III Test of Achievement. Different time frames for each measure were compared. Most alternate‐form reliability coefficients were above .80. Criterion‐related validity coefficients ranged from .77 to .89. No differences related to time were found. Only maze selection reflected significant growth, with an average increase of 1.29 correct choices per week. Maze growth was related to the reading performance level and to change on the Woodcock–Johnson III from pre‐ to posttest.  相似文献   

舍宾(SHAPING)形体训练对中青年女性心肺功能、身体形态及素质影响的研究     

米艳 《中国体育科技》2006,42(5):101-103

研究目的:由于社会地位的改变,社会责任及义务的增加,女性的健康状况成了社会普遍关注,不容忽视的问题。通过舍宾形体训练对中青年女性部分生理指标影响的研究,对比分析出其科学性、实效性。研究方法:采用文献资料调研、实验法、数理统计法、比较法。主要结果和结论:舍宾形体训练能使中青年女性的心肺功能得到较明显的改善;舍宾形体训练对改善中青年女性身体形态非常有效;舍宾形体训练能提高中青年女性的力量素质及柔韧素质。建议:高校将舍宾形体训练系统引入女生健康、健美教学;将舍宾发扬光大,使更多的女性朋友了解舍宾,进入舍宾,进而更加完善自我。  相似文献