Cross-sectional comparison of body composition and resting metabolic rate in Premier League academy soccer players: Implications for growth and maturation

ABSTRACT

For the first time we aimed to: (1) assess fat-free mass (FFM) and RMR in youth soccer players, (2) compare measured RMR to estimated RMR using previously published prediction equations, and (3) develop a novel population-specific prediction equation. In a cross-sectional design, 99 males from a Premier League academy underwent assessments of body composition (DXA) and RMR (indirect-calorimetry). Measured RMR was compared to estimated values from five prediction equations. A novel RMR prediction equation was developed using stepwise multiple regression. FFM increased (P<0.05) between U12 (31.6±4.2 kg) and U16 (56.3±5.3 kg) after which no further increases occurred (P>0.05). RMR in the U12s (1655±195 kcal.day^?1), U13s (1720±205 kcal.day^?1) and U14s (1846±218kcal.day^?1) was significantly lower than the U15s (1957±128 kcal.day^?1), U16s (2042±155 kcal.day^?1), U18s (1875±180 kcal.day^?1) and U23s (1941±197 kcal.day^?1) squads (P>0.05). FFM was the single best predictor of RMR (r²=0.43; P<0.01) and was subsequently included in the novel prediction equation: RMR (kcal.day^?1) = 1315 + (11.1 x FFM in kg). Both FFM and RMR increase from 12-16 years old, thus highlighting the requirement to adjust daily energy intake to support growth and maturation. The novel prediction RMR equation developed may help to inform daily energy requirements.     

Students' reactions to teachers' physical attractiveness and nonverbal behavior: Two exploratory studies

Two studies describe how students' reactions are affected by the physical attractiveness and nonverbal behavior of a teacher. In the first experiment, 9- and 13-year-old students watched a videotaped session given by a female teacher. A physical attractiveness stereotype was found in ratings of the teacher; a teacher who looked attractive was rated as more competent and better able to stimulate and motivate students that when she looked unattractive. The second experiment used fifth-grade children who participated individually in a lesson given by a female teacher. Close behaviors by a teacher (eye contact, leaning forward, smiling, and head nods) produced more positive ratings than distant behaviors by the same teacher (little eye contact, leaning away, frowning, and side to side head movements). No effects on academic performance measures were found in either study due to teacher characteristics.     

A practical reinforcement hierarchy for classroom behavior modification

A practical reinforcement hierarchy was proposed for classroom-based behavior modification programs. The seven-level hierarchy ranged from primitive consequences (Le., Infantile Physical Contact and Food) through the more abstract consequences (i.e., Praise and Internal Self-Reinforcement). Suggestions were made for using the hierarchy in teacher consultation and behavior modification planning.     

Effects of classroom environment on science attitudes: A cross‐cultural replication in Indonesia‡

A three‐phase study, with a different sample for each phase, involved a total of 1125 secondary school students in Indonesia. The first phase involving 373 grade 8 and 9 students was used to develop and validate an Indonesian classroom environment instrument with eight scales based on the Individualized Classroom Environment Questionnaire and the Classroom Environment Scale. In the second phase of the study, 502 Indonesian science students in grades 11 and 12 were involved in a translation, adaptation and validation of a four‐scale Indonesian version of the Test of Science‐Related Attitudes. In the third phase, these new Indonesian attitude and environment scales were used with another sample of 250 Indonesian biology students in an investigation of the effects of classroom psychosocial environment on students’ science‐related attitudes. The finding of statistically significant associations between environment and attitudes replicated much prior work in science classrooms in developed countries. For example, more favourable science‐related attitudes on several scales were found in classes perceived as having more personalization, participation, investigation and order and organization.

     

Testosterone during pregnancy and gender role behavior of preschool children: a longitudinal,population study

Levels of testosterone (T) and sex hormone-binding globulin (SHBG) were measured in blood samples from pregnant women and related to gender role behavior in 342 male and 337 female offspring at the age of 3.5 years. Gender role behavior was assessed using the Pre-School Activities Inventory, a standardized measure on which a parent indicates the child's involvement with sex-typical toys, games, and activities. Levels of T, but not SHBG, related linearly to gender role behavior in preschool girls. Neither hormone related to gender role behavior in boys. Other factors, including the presence of older brothers or sisters in the home, parental adherence to traditional sex roles, the presence of a male partner in the home, and maternal education, did not relate to gender role behavior in this sample and did not account for the relation observed between T and behavior. Although other, unmeasured factors may explain the relation, the results suggest that normal variability in T levels prenatally may contribute to the development of individual differences in the gender role behavior of preschool girls.     

SCHOOL‐WIDE POSITIVE BEHAVIORAL INTERVENTIONS AND SUPPORTS FOR STUDENTS WITH EMOTIONAL AND BEHAVIORAL DISORDERS

This investigation employed a participatory action research method involving school psychology consultants and educators to design and evaluate the impact of school‐wide positive behavioral interventions and supports in a self‐contained school serving students with emotional and behavioral disorders. The traditional practices of a universal system, including teaching and acknowledging expected behaviors and responding to disruptive behaviors, were adapted to better accommodate the needs of a more challenging student population. In addition, system‐wide practices, including various teaming and professional development strategies, were instituted to promote sustainability. Results, after implementation of Tier 1, showed reductions in the frequency of discipline referrals and the number of emergency safety interventions, with a sustained impact across the next 3 years. Limitations included the lack of experimental control in evaluating the intervention. Discussion includes recommendations for an expanded role for school psychologists in promoting evidence‐based practices for high‐risk student populations.     

An Online Questionnaire for Evaluating Students' and Teachers' Perceptions of Constructivist Multimedia Learning Environments

The purpose of this article is to describe the development, validation and use of the Constructivist Multimedia Learning Environment Survey (CMLES). This questionnaire assesses teachers' and students' perceptions of the learning environment when students use online multimedia programs while teachers use constructivism as a referent for their teaching. The design of the questionnaire was based on a constructivist approach to learning and focused on the process of learning with the multimedia program and on the nature of that program. Before the use of the CMLES becomes widespread, it was important to determine whether it is valid and reliable. Therefore, a study involving 221 students in 12 high school classrooms into statistical validation and interpretive validation of the questionnaire was undertaken. For this sample of Grade 10 and 11 students who completed the actual and preferred forms of the questionnaire, the CMLES scales demonstrated a high degree of internal consistency reliability (with alpha reliability coefficients ranging from .73 to .82), as well as satisfactory factorial validity and discriminant validity. Therefore, the study supports the reliability and validity of the CMLES for assessing students' and teachers' perceptions of one important aspect in evaluating learning environments which promote the use of multimedia programs and constructivist learning approaches.     

Academic achievement in first-year university: who maintains their high school average?

The present study investigates the characteristics which differentiate between first-year university students who maintain their high school averages (Maintainers: n = 165) and those whose averages decrease at least one letter grade (Decliners: n = 435). The 600 students entered first year at one of six Canadian Universities, which varied in size and ethnic diversity. Data were collected in August, prior to the start of school, and in November of first year. Multivariate analyses indicated significant group differences between Maintainers and Decliners on familial variables (gender, fathers’ education level, but not family income, parental reciprocity, parental support or immigrant/generational status), psychological well-being (perceived stress in August and November, and November depression, self-esteem and health), and university adjustment (university plans, transition perception, time management and university adaptation). The current study addresses a gap in the existing academic achievement literature, while providing practical information to students, parents, and educators involved in the transition to university.     

Learning environments research in English classrooms

Although learning environments research has thrived for decades in many countries and school subjects, English classroom environment research is still in its infancy. This article paves the way for expanding research on English classroom environments by (1) reviewing the limited past research in English classrooms and (2) reporting the first study of English learning environments in Singaporean primary schools. For a sample of 441 grade 6 students, past research in other subjects was replicated in that a modified version of the What Is Happening In this Class? questionnaire was cross-validated, classroom environment was found to vary with the determinants of student sex and ethnicity, and associations emerged between students’ attitudes and the nature of the classroom environment.