Impact of compliance with different guidelines on physical activity during pregnancy and perceived barriers to leisure physical activity

Abstract

The aims of the this prospective study were to analyse physical activity (PA) engagement during the first and second trimesters, considering the different guidelines published on PA, to document the individual characteristics associated with the accomplishment of these guidelines and to examine pregnant women’s perceived barriers to leisure PA, using a socioecological framework. A sample of 133 pregnant women in two stages – at 10–12 weeks’ gestation (T1) and 20–22 weeks’ gestation (T2) – were evaluated. PA was assessed by accelerometry during the T1 and T2 evaluation stages. Socio-demographic characteristics, lifestyle factors and barriers to leisure PA were assessed via questionnaire. A large proportion of women (ranging from 32% to 96%) did not reach the levels of PA recommended by the guidelines. There were no significant differences between T1 and T2 with regard to compliance with PA recommendations. A decrease in PA levels from T1 to T2 was noted for all recommendations. No associations were found between participants’ characteristics and adherence to the recommendations in T1 and T2. No significant differences were found in barriers to leisure PA between T1 and T2. The most commonly reported barriers to leisure PA were intrapersonal, not health related. Our results indicate that there were no differences between trimesters regarding compliance of PA recommendations, and perceived barriers were similar in both trimesters.     

Guava extract （Psidium guajava） alters the labelling of blood constituents with technetium-99m

Psidium guajava （guava） leaf is a phytotherapic used in folk medicine to treat gastrointestinal and respiratory disturbances and is used as anti-inflammatory medicine. In nuclear medicine, blood constituents （BC） are labelled with technetium-99m （^99mTc） and used to image procedures. However, data have demonstrated that synthetic or natural drugs could modify the labelling of BC with ^99mTC. The aim of this work was to evaluate the effects of aqueous extract of guava leaves on the labelling of BC with ^99mTc. Blood samples of Wistar rats were incubated with different concentrations of guava extract and labelled with ^99mTc after the percentage of incorporated radioactivity （%ATI） in BC was determined. The results suggest that aqueous guava extract could present antioxidant action and/or alters the membrane structures involved in ion transport into cells, thus decreasing the radiolabelling of BC with ^99mTc. The data showed significant （P〈0.05） alteration of ATI in BC from blood incubated with guava extract.     

Changing families,changing childhoods: changing schools?

This paper reports key findings from a study of young people’s engagement in ‘atypical’ activities in their families. The project focused on young caring and language brokering as two roles that are not assumed to be ‘normal’ activities for children and young people. The findings presented are from a survey of 1002 young people and from one‐to‐one interviews with a sample selected from the survey sample. The voices of young people in the interview study are used in the paper to illustrate the diverse range of childhood experiences. The paper discusses some of the ways in which pastoral systems in schools can take account of diverse childhoods and family needs more effectively than they have done in the past.     

Longitudinal associations between motor competence and different physical activity intensities: LabMed physical activity study

An appropriated level of motor competence is essential for children´s healthy growth and development and a key factor in the promotion of lifelong active lifestyles and health.

The purpose of this study was to examine associations between motor competence and different physical activity intensities (light, moderate, moderate-to-vigorous and vigorous physical activity), as well as total physical activity, over a two-year period, in adolescents. The sample comprised of 103 adolescents (13.49 ± 0.87 years, 53 girls), from the north of Portugal. Motor competence was evaluated with the body coordination test, Körperkoordination-Test-für-Kinder. Physical activity was objectively assessed with GT1M accelerometers (ActiGraph, Pensacola, FL, USA). Physical activity variables were expressed as proportions of accelerometer wear time. Regression analyses showed positive longitudinal associations between motor competence at baseline and moderate physical activity (B = 0.0033, p = 0.018), moderate-to-vigorous physical activity (B = 0.0052, p = 0.024) and total physical activity (B = 0.067, p = 0.040) at follow up, after adjustments for age, sex, the corresponding physical activity intensity at baseline, body mass index, pubertal stage and socioeconomic status. Our ?ndings highlight the importance of motor competence development to promote moderate-to-vigorous physical activity during adolescence.     

四种作用力的大统一场论已近在眼前

伟大的科学家Einstein曾说他感觉到自然界有统一性,他说“这是一种壮丽的感觉”,他首先提倡研究四种作用力的统一场论,提出过“黎曼空间几何统一场论”[1,2],未能成功。后来也有人提出“量子统一场论”[3],“规范统一场论”[4],“弱-电统一场论”[5,6,7],“三种力统一场论”[8]     

LGBTQ student experiences in schools from 2009–2019: A systematic review of study characteristics and recommendations for prevention and intervention in school psychology journals

The present systematic review analyzes ways in which empirical studies in the field of school psychology have studied the experiences of lesbian, gay, bisexual, transgender, and queer (LGBTQ) students in the past decade (2009–2019). Results from 23 studies revealed an over-representation of quantitative studies conducted mostly in the United States and an over-representation of majority White, cisgender, and high school participants across studies. Results also showed that studies in the last decade have: (a) focused on exploring negative attitudes and behaviors toward LGBTQ students and the outcomes of these attitudes and behaviors, (b) provided direction on how to support LGBTQ students in schools, and (c) analyzed the effects of bystanders and perpetrators on the well-being of LGBTQ students. In addition, this review revealed ways in which studies in school psychology journals present prevention and intervention practices for creating a safe environment for LGBTQ students, including: (a) policies that focus on the inclusion and protection of LGBTQ students, (b) training for faculty and other school staff to promote LGBTQ students' safety, and (c) curriculum and extracurricular activities that address LGBTQ issues. We provide recommendations for improving the experiences of LGBTQ students in schools such as involving community stakeholders in drafting affirming policies.     

从夸饰与虚构的运用看《战国策》的文学价值

具有重要史料价值的《战国策》,因大量纵横游说之辞中对夸饰与虚构手法的运用而富有浓厚的学色彩,其夸饰与虚构的体现形式多种多样。《战国策》的学成就,在先秦史传学中,许多方面具有独创性,对后世学的发展产生过深元的影响。     

The social mediation of learning in multiethnic schools: Introduction

The ethnic diversity within schools is a major challenge for education in most European countries. The diversity of cultural backgrounds of students and parents leads to new transitions, enables new forms of participation, and demands the creation of new concepts, values and practices. Processes of mediation have a vital place in the required developments. The contributions to this issue study the relationship between learning and social mediation on three levels: (1) the mediating role of cultural tools, in particular language and the curriculum, (2) the role of peers and teachers in the appropriation of cultural tools by minority students, and (3) the mediating role of social representations in the shaping of students’ identities at school.     

Social representations as mediators of practice in mathematics classrooms with immigrant students

This article suggests that a critical perspective of the notion of social representations can offer useful insights into understanding practices of teaching and learning in mathematics classrooms with immigrant students. Drawing on literature using social representations, previous empirical studies are revisited to examine three specific questions: what are the dominant social representations that permeate the mathematics classroom with immigrant students? What impact do these social representations have on classroom practices? What are the spaces for changing these practices through becoming reflective and critically aware of these representations? These questions are addressed mostly in relation to teachers’ representations, though the article also draws on data from research with students and parents to illustrate the diversity of representations and to argue for a critical and reflective perspective.