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   

Validity and reliability of a linear positional transducer across commonly practised resistance training exercises     

Harry F. Dorrell  Joseph M. Moore  Mark F. Smith  Thomas I. Gee 《Journal of sports sciences》2019,37(1):67-73

This study investigated the validity and reliability of the GymAware PowerTool (GPT). Thirteen resistance trained participants completed three visits, consisting of three repetitions of free-weight back squat, bench press, deadlift (80% one repetition maximum), and countermovement jump. Bar displacement, peak and mean velocity, peak and mean force, and jump height were calculated using the GPT, a three-dimensional motion capture system (Motion Analysis Corporation; 150 Hz), and a force plate (Kistler; 1500 Hz). Least products regression were used to compare agreeability between devices. A within-trial one-way ANOVA, typical error (TE; %), and smallest worthwhile change (SWC) were used to assess reliability. Regression analysis resulted in R² values of >0.85 for all variables excluding deadlift mean velocity (R² = 0.54–0.69). Significant differences were observed between visits 3-2 for bench press bar displacement (0.395 ± 0.055 m; 0.383 ± 0.053 m), and deadlift bar displacement (0.557 ± 0.034 m; 0.568 ± 0.034 m). No other significant differences were found. Low to moderate TE (0.6–8.8%) were found for all variables, with SWC ranging 1.7–7.4%. The data provides evidence that the GPT can be used to measure kinetic and kinematic outputs, however, care should be taken when monitoring deadlift performance.  相似文献   

试论田径运动中的速度     

马屹 《武汉体育学院学报》2003,37(1):64-66

采用生物力学原理分析了田径运动成绩与运动这间的关系。认为田径运动成绩虽然表现在时间、高度和远度上，但实质是个速度问题。只有获得高的运动速度，才能有高水平的运动成绩。并进一步总结出与成绩关系最为紧密的3种速度，即跑的后蹬速度，起跳速度和器械出手速度。分析了速度产生的原因以及创造和保持高速度运动的条件。  相似文献   

时代特征与马克思主义的理论形态     

毛根民 《苏州市职业大学学报》2003,14(4):4-10

150多年来，马克思主义随着人类历史的发展和时代课题的解决，在实践中形成了新的形态，使马克思主义成为与时俱进的普遍真理，使社会主义在曲折中不断向前发展，成为人类社会发展不可逆转的总趋势。  相似文献   

教师专业化背景下反思型体育教师培养模式   总被引：1，自引：0，他引：1  

霍军 《湖北体育科技》2006,25(6):723-725

教师的专业化发展要求教师成为反思型教师,而反思型教师的成熟和发展离不开教育实践的锻炼和促进,只有将实践中反映出来的问题上升到理论层面加以反思,才能探寻到根源,使主体的合理性水平得到提升和拓宽.体育教师要坚持积极的自我反思与实践,以主体身份投入其中,扩大自己的专业视野,逐步养成教育反思的习惯,建立自我反思机制,成为反思型教师,同时促进教师专业化发展.  相似文献   

从消费行为的视角看体育用品消费者购买行为模式   总被引：5，自引：0，他引：5  

唐衍平  万翠琳 《山东体育学院学报》2004,20(5):25-26

在归纳影响体育用品消费购买行为因素的基础上，分析了体育用品消费购买行为的整个发展过程，提出体育用品消费购买行为的总模式和详细模式。  相似文献   

世界女子马拉松项目竞争格局的演变与发展趋势   总被引：1，自引：0，他引：1  

吴长稳  于奎龙 《辽宁体育科技》2008,30(4):45-46

运用文献资料法、数理统计法、比较法等对世界女子马拉松项目的发展历史进行回顾。分析该项目的世界格局与发展趋势，结果发现：女子马拉松项目相对集中，优势国家特征明显。29届奥运会我国在该项目的目标定位是夺取金牌。  相似文献   

老年人健身模式中力量训练的必要性与可行性研究   总被引：2，自引：0，他引：2  

马新东  高前进 《沈阳体育学院学报》2004,23(3):281-283

力量训练是老年人体育健身的重要问题,分析了力量锻炼对老年人健康的影响以及老年人加强力量素质的意义,阐述了不同肌肉力量指标对老年人健康生活的作用,揭示了肌肉离心收缩在老年人力量锻炼中的优越性,旨在为老年人体育健身提供可借鉴的理论依据。  相似文献   

论南拳运动员的速度力量训练     

徐美玲 《浙江体育科学》2004,26(6):92-94

南拳的核心是劲力,没有速度就不会有劲力的体现,而要提高速度,增强速度力量是关键措施之一,文章从训练实践角度,并结合理论,较全面地分析了南拳运动员速度力量训练的重要性,并对如何提高南拳运动员的速度力量提出几点建议.  相似文献   

建构主义学习理论对高校健美操教学的启示     

王萌  张士强 《沈阳体育学院学报》2004,23(5):704-705

建构主义学习理论倡导在教学过程中以学生为中心,充分发挥学生的能动性、积极性和首创精神,教师则起组织者、指导者、帮助者和促进者的作用。传统的以运动技术为中心的健美操教学已不能充分体现当今的体育教学改革的宗旨。以建构主义学习理论为指导,分别从教学方式、教学内容、教学评价三方面提出了新的教学思路,以期为我国高校健美操教学提供新的理论依据与实践指导。  相似文献