Identifying the optimal body shape and composition associated with strength outcomes in children and adolescent according to place of residence: An allometric approach

The purpose of the study was to identify the optimal body shape and composition associated with physical fitness levels of children living in urban and rural areas of Italy. A total of 7102 children (11–14 years) were assessed for weight, height, percentage body fat (FM%), sit-and-reach flexibility (SAR), standing broad jump (SBJ) and sit-ups (SUP). A multiplicative allometric model, Y = a · mass^k1 · height^k2 ·ε, was used to predict the physical outcome variables Y = SBJ and SUP. The model was expanded to incorporate FM% and SAR as follows Y = a · mass^k1 · height^k2 · FM%^k3 · exp(b· FM% + c· SAR) ·ε. Note that FM% was incorporated as a “gamma function” that allows an initial growth, and subsequent decline in Y as FM% increases in size. Although having an ectomorph body shape appears advantageous, being too thin appears detrimental to the strength outcomes. Being flexible would also benefit physical fitness levels. Finally, our results indicate that ursban children aged 11–14 have superior strength outcomes compared with rural children, having controlled for differences in body shape and composition, a finding that may be associated with rural environments having fewer exercise facilities compared with urban conurbations.     

Thermo-formation process of plastic shells for winter sport boots for improved comfort

We have performed a study on the thermo-formation process of plastic shells of boots for winter sports. The aim of the work has been to determine how the process parameters can improve the ergonomic and thermal comfort for athletes and winter sports participants. We have found that the initial deformation and memory effect are strongly influenced by the type of thermoplastic material used, heating time and cooling procedure. We have also found that the ovens currently used for this process are not correctly designed to obtain an efficient heat transfer and, therefore, a heating time of at least 12 min is necessary to achieve an average deformation of more than 2 mm. The measure of the boot flexural stiffness has shown that there are no changes in the load–deflection behavior after the thermo-formation process of a ski boot made of thermoplastic polyurethane. We have also found that the thermo-formation process decreases the pressure on skier’s feet of more than five times and, therefore, improves the comfort of the skier.     

Evaluation of body composition with bioimpedence. A comparison between athletic and non-athletic children

Purpose: Conventional Bioelectrical Impedance Analysis (BIA) or Bioelectrical Impedance Vector Analysis (BIVA) can provide direct evaluations of body composition. The purpose of this study was to evaluate lean and fat mass (FM), and hydration of children involved in daily competitive sports. Methods: 190 non-athletic [8.2–10.5 years] and 29 competitive children [8.0–10.5 years] were enrolled. They were evaluated: at baseline (t0), 6 months (t1) and one year (t2). Anthropometric, BIA and BIVA, lean and FM, and hydration evaluations were performed. Results: Resistance (R/h) and reactance (Xc/h) were lower at t0 in competitive individuals when compared to controls. Xc/h (+3.28) significantly increases in competitive when compared to non-competitive individuals (+0.66, p for difference: 0.011), while phase angle (PA) was lower at t0 (5.72 vs. 6.17, p?<?.001) and after 6 months (p?=?.001). Total body water adjusted for height (TBW/h) significantly increased only in non-athletes (+0.50?±?0.13, p?<?.001) between t0 and t1. At t1, extracellular water (ECW) significantly decreased (p?=?.026) in the two groups: ?0.45?±?0.19% in non-competitive, ?1.63?±?0.49% in competitive subjects, while intracellular water (ICW) increased. At one-year follow-up (t2), there were no statistically significant differences in R/h, Xc/h and PA in competitive individuals when compared to baseline and t1. Furthermore, we observed at t2 that hours/week of training, age, male gender and body mass index can influence FFM/h and FM/h in both competitive and non-competitive subjects. In particular, a direct correlation was for hours/week and FFM/h, inverse for hours/week and FM/h. Conclusions: Body mass index does not allow evaluating differences in lean body mass and FM between athletes and non-athletes. BIA and BIVA can give more reliable details about body composition differences in competitive adolescents and non-competitive, outlining a progressive decline in ECW and increase in ICW without affecting TBW composition of athletes.     

The efficacy of demonstrations in teaching children an unfamiliar movement skill: the effects of object-orientated actions and point-light demonstrations

In Experiment 1, adult and child participants were instructed to imitate a video model performing a bowling action with or without a ball. Participants imitated the action with greater accuracy without a ball and in general adults were more accurate than children. In Experiment 2, adults and children were shown a video or point-light display of the bowling action. There was no difference in movement form between the adult point-light and video groups. In contrast, children were poorer at reproducing the action when viewing point-light compared with video sequences (P < 0.05). The novel point-light display hindered the children's ability to provide conceptual mediation between the presented information and action requirements. In Experiment 3, a child point-light group was provided with perceptual-cognitive training. The perceptual-cognitive training group demonstrated better movement reproduction than a group who viewed the point-light displays with no training (P < 0.05), although there were no differences between participants who received training and those who viewed a video. Children are able to perceive and use relative motion information from a display after some general training, and the effectiveness of demonstrations needs to be judged relative to the task context.     

Reconceptualising higher education pedagogy in online learning

The purpose of this collaborative inquiry project was to examine teacher education practices in two early childhood degree programmes in a school of education at a regional university in Australia. All students are enrolled in these online courses as distance learners. The reconceptualised online pedagogy immersed students, peers and their lecturers in ‘teaching through assessment’ (Edwards, 2010) in a collaborative online environment that mirrors the complexity that students are experiencing in their workplaces. This article describes the pedagogical and conceptual underpinnings we used to reconceptualise our degree programmes. It also outlines our evolving conceptualisations of learning as knowledge creation (Hong & Sullivan, 2009) in the context of our teaching and learning in online courses.     

Head Start and Unintended Injury: The Use of the Family Map Interview to Document Risk

Much is known about how to provide safe environments for preschool children (3–5 years-of-age); however, many preschool children still experience preventable injuries—particularly children living in poverty. This study examined the use of an assessment tool used to identify children at risk for unintended injury in two large, federally funded Head Start programs during home visits. Families of preschool children in two multi-center Head Start programs (N = 499 and N = 228) were screened by teachers for risks related to safety in their home and parenting environment during mandatory Head Start home visits in the fall and spring. The safety screening tool was part of an established, broader interview assessment called the Family Map, which was designed to help Head Start programs meet mandatory performance standards related to the identification of risk and strengths in the family. Study results indicated that a large number of preschool children from low-income backgrounds were at risk for a variety of risks related to unintentional injury. Further, in some areas Head Start families increased their safety related parenting behaviors by the second assessment with different areas noted in the two programs. This study demonstrated that, beyond the use of the tool to identify families in need of intervention services, it can be used by childcare providers to effectively monitor family need and for program self-assessment.     

Measuring the potential for child maltreatment: the reliability and validity of the Adult Adolescent Parenting Inventory--2

OBJECTIVE: The field of child protection needs reliable and valid methods of assessing the potential for child abuse and neglect. The purpose of this study was to examine the psychometric properties of the Adult Adolescent Parenting Inventory--2 (AAPI-2), Form B, using a sample of 309 low-income, rural families in a southern state. METHOD: The AAPI-2 is a 40-item survey designed to assess the parenting and child rearing attitudes of adult and adolescent parent and pre-parent populations. Each of the five AAPI-2 scales was (a) examined using factor analysis in order to determine the unidimensionality of the scale, (b) evaluated based on estimates of the scales reliability in order to determine the consistency with which the construct was measured, and (c) when possible, examined to determine if it is related to other constructs in meaningful and expected ways. RESULTS: While the factor structure reported by the developer was not fully confirmed in this sample, there is some evidence that the instrument is measuring at least two of the constructs it purports to measure and that the total score may be useful. Correlations with other instruments measuring parenting behavior and child behavior were significant, and in the expected direction, offering some support for the validity of the AAPI-2. CONCLUSIONS: While the AAPI-2 appears to measure attitudes related to harsh or neglectful parenting, caution should be used in the interpretation of the individual AAPI-2 scales.     

Adults matter: Protecting children from the negative impacts of bullying

This study examines the degree to which support from parents and teachers buffers the level of depression for four groups of children involved in bullying (victim, bully, bully‐victims, or not involved children). Nine hundred and seventy‐seven 5th‐, 9th‐, and 11th‐grade students in the rural South completed questionnaires on bullying, social support, and depression. Children who were not involved in bullying reported less depression and more social support than children involved in bullying, and bully‐victims were the most at‐risk group. Furthermore, results indicate that in all four bully status groups, children reported fewer symptoms of depression when support from parents was high compared to when it was low. For all groups except victims, when parental support was low, support from teachers was associated with fewer symptoms of depression. When parental support was high, the impact of support from the teacher was not significant. © 2009 Wiley Periodicals, Inc.