Deleterious effects of obesity on physical fitness in pre-pubertal children

The prevalence of obesity in children has increased dramatically during the past decades in Europe and understanding physical fitness and its components in children is critical to design and implement effective interventions. The objective of the present study was to analyse the association between physical fitness (aerobic, speed, agility, power, flexibility and balance) and body mass index (BMI) in pre-pubertal children. A total of 2411 healthy schoolchildren (7–11 years) participated in this study. Anthropometric characteristics and body composition were assessed by skinfold thickness. Physical fitness was measured by nine physical fitness tests: endurance running, 20 m running speed, agility, handgrip strength, standing long jump and squat jump, sit and reach, medicine ball forward throw and static balance. No relevant differences were observed between boys and girls regarding anthropometric characteristics, body composition and physical fitness. However, overweight and obese children showed significantly lower physical fitness levels in endurance running, speed and agility (mean: +18.8, +5.5 and +14.5% of time to complete tasks, respectively), lower limb power normalised to body mass (?23.3%) and balance tests (number of falls: +165.5%) than their normal weight counterparts. On the other hand, obesity did not affect handgrip, throwing and flexibility. In conclusion, increased BMI was associated with lower performance capabilities limiting proper motor skill development, which directly affects the ability of children to take on sports skills. Actions undertaken to promote children's wellness and fitness should be prioritised and introduced early in life with the aim of enhancing physical fitness as well as preventing overweight and obesity.     

A Balancing Act: Developing a Discourse Community in a Mathematics Classroom

This article examines the pedagogical tensions involved in trying to usestudents' ideas as the basis for class discussion while also ensuring thatdiscussion is productive mathematically. The data for this study of theteaching of one middle-school teacher come from observations andvideotapes of instruction across a school year as well as interviews with theparticipating teacher. Specifically, the article describes the teacher'sattempts to support a student-centered process of mathematicaldiscourse and, at the same time, facilitate discussions of significantmathematical content. This tension in teaching was not easily resolved;throughout the school year the teacher shifted his emphasis betweenmaintaining the process and the content of the classroom discourse.Nevertheless, at times, the teacher balanced these competing goals by usinga ``filtering approach' to classroom discourse. First multiple ideas aresolicited from students to facilitate the process of student-centeredmathematical discourse. Students are encouraged to elaborate theirthinking, and to compare and evaluate their ideas with those that havealready been suggested. Then, to bring the content to the fore, the teacherfilters the ideas, focusing students' attention on a subset of themathematical ideas that have been raised. Finally, the teacher encouragesstudent-centered discourse about these ideas, thus maintaining a balancebetween process and content.     

Academic underachievement: Relationship with cognitive motivation,achievement motivation,and conscientiousness

In this study, the role of need for cognition, achievement motivation, and conscientiousness on academic underachievement was investigated. Forty‐seven male and 46 female students in Grades 7 to 10 participated in the study. Student attributes were assessed by self‐report measures, school performance by academic grades, and intellectual abilities by a standardized structure of intelligence test. A regression analytic model (prediction of grade point average by general intelligence) was used to operationally define underachievement. A categorical cutoff definition as well as a continuous definition was investigated. All relationships between underachievement scores and need for cognition, achievement motivation scales, and conscientiousness showed linearity. This warranted the use of a continuous definition of underachievement. Results revealed that need for cognition as well as facilitating anxiety contributed the most to the explanation of underachievement. © 2006 Wiley Periodicals, Inc. Psychol Schs 43: 401–411, 2006.     

Effects of a Learner-Centred Environment on the Academic Competence and Motivation of Students at Risk

This study examined the efficacy of a learner-centred environment in enhancing the academic achievements and motivation of high school students who are at risk of dropping out of school. Three groups of students at high academic risk were compared. The control group consisted of students who are exposed to a remedial academic program in a traditional school context, and the experimental groups consisted of students enrolled at schools that have implemented a structured academic program in a learner-centred environment. It is shown that a learner-centred environment yields significantly higher achievement scores and a somewhat higher internal motivational orientation. These results suggest that a structured academic program in a learner-centred environment could provide hope for students at academic risk and other students who are likely to be lost to the academic educational system.     

Negotiation Over Bids for Compliance of Three-Year-Old Kibbutz Children: A Narrative Approach

Thirty kibbutz children, boys and girls, whose ages ranged between 35 and 38 months, participated in a study on compliance to bids of mother and caregiver. Children participated in the Doll Play Interview, and were requested to determine whether a narrated child will indulge his or her wish or comply with opposing bids of a narrated mother or a narrated caregiver. Results indicated that narrated mothers were described more often as initiating close contact with the child, whereas caregivers were perceived as more strict and aggressive. However, narrated mothers were not perceived as more willing to accept child incompliance. Narrated children responded in either a more compliant or a more self-assertive way to bids of mother. Rather than choosing between complying or uncomplying with similar bids of caregiver, they tended more often to ignore them. In the presence of a narrated mother children expressed their thoughts and feelings more freely. They spoke with caregiver more often on actions and objects. Conflict with a narrated mother was associated with seeking close contact between the child doll and the mother doll, whereas similar conflict with a narrated caregiver resulted more often in seeking physical proximity outside the story, with the child's real mother.     

Preschool Teachers’ Implementation of Vocabulary Strategies During Shared Reading: a Comparative Study

Research Findings: Shared reading is reported to be the single best instructional practice for emergent literacy skills. Vocabulary instruction practices implemented during shared reading by both Head Start (HS) teachers and teachers from more affluent private school settings were compared to determine whether there were differences between the 2 groups of teachers in their implementation of research-based practices. HS teachers implemented vocabulary instruction practices during shared reading more often, and chose different words to instruct, than private school teachers. Whereas 78% of HS teachers provided some vocabulary instruction during shared reading, only 59% of private school teachers did so. Among those teachers who provided vocabulary instruction during shared reading, HS teachers used significantly more contextualization strategies for word instruction than private school teachers. These findings suggest that preschool teachers who work with children from high-needs backgrounds use vocabulary instruction during shared reading as a way to bolster children’s vocabularies more frequently than teachers working in private preschools that serve children from more privileged backgrounds. Extratextual language was also compared, and private school teachers had a higher mean length of utterance and type–token ratio than the HS teachers. Practice or Policy: Professional development is recommended for preschool teachers to increase the implementation of best practices for vocabulary instruction during shared reading.     

The Development of Leadership among Chemistry Teachers in Israel

The implementation of new content and pedagogical standards in science education in Israel as well as in other countries necessitates intensive, life-long professional development of science teachers. Here we describe a model for the professional development of chemistry teacher-leaders. In the first part of the paper, we describe a model for the development and change of chemistry teacher-leaders. In the second part of the paper, we present the assessment of teachers' change. It is suggested, that in order to become a leader, the teacher has to undergo several interrelated phases of development and changes, namely personal, professional, and social. In order to attain these changes, a two-year program was designed in which teachers were given opportunities to develop their content knowledge, pedagogical content knowledge, and their leadership abilities and skills. The assessment of teachers' professional development clearly showed that engaging teachers in a long-term professional development program changed their beliefs (personal change) regarding their role as chemistry teachers in general and their confidence to become leaders in particular. In addition, we observed that the teachers changed in their professional abilities as well as in their social behavior. We also report on the involvement of the teacher-leaders in activities in which leadership skills were implemented in attempting to reform chemistry education in Israel.     

Sensory Processing in Rhesus Monkeys: Developmental Continuity,Prenatal Treatment,and Genetic Influences

Neonatal sensory processing (tactile and vestibular function) was tested in 78 rhesus macaques from two experiments. At ages 4–5 years, striatal dopamine D₂ receptor binding was examined using positron emission tomography. At ages 5–7 years, adult sensory processing was assessed. Findings were: (a) prenatal stress exposure yielded less optimal neonatal sensory processing; (b) animals carrying the short rh5‐HTTLPR allele had less optimal neonatal sensory scores than monkeys homozygous for the long allele; (c) neonatal sensory processing was significantly related to striatal D₂ receptor binding for carriers of the short allele, but not for animals homozygous for the long allele; and (d) there was moderate developmental continuity in sensory processing from the neonatal period to adulthood.     

How is the body’s systemic nature manifested amongst high school biology students?

This study follows two groups of students (67 in all) through the 3 years of their high school biology education and examines the development of their systems thinking - specifically their models of the human body as a system. Both groups were composed of biology majors, but the students in one group also participated in a PBLbased extension program called “Medical Systems”. Data was gathered by means of concept maps, which the students completed at four strategic stages of the learning process: beginning of 10th grade, end of 10th grade, end of 11th grade and end of 12th grade. At the end of the 3 year learning process, the students’ showed more complex system models. They included a wider range of concepts in their maps, spanning hierarchy levels ranging from the molecular and cellular to the system level. We also found an increase in references to dynamic interactions, but this did not encourage the students to use cellular level processes when explaining phenomena that occur at the systems level. The impact of the PBL teaching method was strongly evident in the complexity of the Medical Systems program students’ concept maps, which heavily emphasized “hierarchy” and “diseases” as system characteristics.     

War and peace in the early elementary classroom

She has previously published inCLE and other journals, and has published two children's books,Sea, Salt, and Air, a picture book, andWhen the Frost is Gone, a preadolescent novel