Connecting inside out: Development of the social brain in infants and toddlers with a focus on myelination as a marker of brain maturation

Early childhood is a sensitive period for learning and social skill development. The maturation of cerebral regions underlying social processing lays the foundation for later social-emotional competence. This study explored myelin changes in social brain regions and their association with changes in parent-rated social-emotional development in a cohort of 129 children (64 females, 0–36 months, 77 White). Results reveal a steep increase in myelination throughout the social brain in the first 3 years of life that is significantly associated with social-emotional development scores. These findings add knowledge to the emerging picture of social brain development by describing neural underpinnings of human social behavior. They can contribute to identifying age-/stage-appropriate early life factors in this developmental domain.     

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

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.     

Digital Module 16: Longitudinal Data Analysis

In this digital ITEMS module, Dr. Jeffrey Harring and Ms. Tessa Johnson introduce the linear mixed effects (LME) model as a flexible general framework for simultaneously modeling continuous repeated measures data with a scientifically defensible function that adequately summarizes both individual change as well as the average response. The module begins with a nontechnical overview of longitudinal data analyses drawing distinctions with cross-sectional analyses in terms of research questions to be addressed. Nuances of longitudinal designs, timing of measurements, and the real possibility of missing data are then discussed. The three interconnected components of the LME model—(1) a model for individual and mean response profiles, (2) a model to characterize the covariation among the time-specific residuals, and (3) a set of models that summarize the extent that individual coefficients vary—are discussed in the context of the set of activities comprising an analysis. Finally, they demonstrate how to estimate the linear mixed effects model within an open-source environment (R). The digital module contains sample R code, diagnostic quiz questions, hands-on activities in R, curated resources, and a glossary.     

学校体育学生伤害事故的法律责任研究

校园学生伤害事故是目前社会普遍关心的热点问题，学校体育是校园学生伤害事故的多发区。通过对学校体育学生伤害事故法律责任的研究，使学校体育在面对学生伤害事故时，有法可依，也使学校、教师、学生和学生家长在学校体育学生伤害事故中，更明确各自应承担的法律责任。以及权利和义务，依法保障师生双方的权益。     

辨析中国体育的性质

有一种关一吉国体育性质的说法：在社会主义市场经济条件下，中国体育应当是具有产业性的社会主义公益事业，其中产业性是体育的经济属性，社会主义是政治属性，公益性是文化属性。本文对此提出了不同意见。     

培养学生运动技能学习策略的实验报告

运用学习策略理论 ,并结合运动技能学习的特点 ,在田径技术教学中对运动系 2 0 0 1级学生进行了教学实验 ,初步得出以下结论 :在学习运动技能过程中施加学习策略训练有助于学生掌握运动技术 ;在培养学生运用学习策略的能力方面 ,语言法、调控法、认知体验三项指标得到明显改善 ,学习策略能力的培养是一个长期的过程。     

四川省农村体育现状思考

运用问卷法、访谈法、数理统计与逻辑分析等研究法,对四川省8个具有地域代表性的县进行了相关调查,分析了当前四川农村体育的现状,提出了四川农村体育发展的对策,为省体育局制订相关的农村体育政策,指导农村的全民健身活动提供可靠的数据和依据.     

我国单位制的变革与单位体育的发展走向

随着改革的深入发展，我国传统的单位制开始松动，但是单位依然存在。特别是在社区成为改革中日益凸现的社会存在的今天，单位体育应如何发展是社会体育发展中的一个重要的问题。从这一背景出发，在论述单位制改革与社区凸现的基础上，分析了我国单位体育面临的问题及其与社区体育结合的必然性。