Effect of 6-weeks WBVT on the behaviour of the lower limb muscle fibres during vertical jumping

The purpose of the current study was to examine the effect of 6 weeks of whole body vibration training (WBVT) on body composition, muscle activity of the gastrocnemius and vastus lateralis, gastrocnemius muscle architecture (static and dynamic) and ground reaction forces (performance jump) during the take-off phase of a countermovement jump in young healthy adult males. A total of 33 men (23.31 ± 5.62 years) were randomly assigned to a whole body vibration group (experimental group, EG_WBVT: n = 17; 22.11 ± 4.97 years) or a control group (CG: n = 16; 24.5 ± 6.27 years). The total duration of the intervention phase (WBVT) was 6 weeks with a frequency of 3 sessions per week. Statistically significant differences were observed (P ≤ 0.05) between pre- and post-test in the power peak (Δ 1.91 W · kg^?1; P = 0.001), take-off velocity (0.1 cm · s^?1; P = 0.002) and jump height (Δ 0.4 cm; P = 0.002) for EG_WBVT. There were no statistically significant differences in any of the body composition and muscle architecture variables. Moreover, no significant differences were found between EG_WBVT and CG nor changes in muscle activity during take-off phase of the gastrocnemius and vastus lateralis pre- versus post-training. This study suggests that a 6-week WBVT programme with increasing intensity improves jump performance but does not alter muscle activity nor muscle architecture in healthy young men.     

Effects of inspiratory muscle training in professional women football players: a randomized sham-controlled trial

This study was conducted to determine the effects of inspiratory muscle training (IMT) on respiratory and peripheral muscles oxygenation during a maximal exercise tolerance test and on repeated-sprint ability (RSA) performance in professional women football players. Eighteen athletes were randomly assigned to one of the following groups: SHAM (n = 8) or IMT (n = 10). After a maximal incremental exercise test, all participants performed (on a different day) a time-to-exhaustion (Tlim) test. Peripheral and respiratory muscles oxygenation by near-infrared spectroscopy, breath-by-breath ventilatory and metabolic variables, and blood lactate concentration were measured. The RSA test was performed on a grass field. After a 6 week intervention, all athletes were reevaluated. Both groups showed increases in inspiratory muscles strength, exercise tolerance and RSA performance, however only the IMT group presented lower deoxyhemoglobin and total hemoglobin blood concentrations on intercostal muscles concomitantly to an increased oxyhemoglobin and total hemoglobin blood concentrations on vastus lateralis muscle during Tlim. In conclusion, these results may indicate the potential role of IMT to attenuate inspiratory muscles metaboreflex and consequently improve oxygen and blood supply to limb muscles during high-intensity exercise, with a potential impact on inspiratory muscle strength, exercise tolerance and sprints performance in professional women football players.     

Commentary: Development of Perception-Action Systems and General Principles of Pattern Formation

Our commentary on this special issue devoted to Developmental Biodynamics: Brain, Body, and Behavior Connections is divided into 3 main sections. The first section is an overview of the individual contributions. 5 major themes are identified: (1) inappropriateness of computational treatments of development and the need for more biologically and physically relevant treatments; (2) significance of tailoring muscular to nonmuscular forces in developing movement coordination; (3) importance of spontaneous movements as exploratory and formative mechanisms; (4) influences of action capabilities on the development of perception capabilities, and vice versa; (5) applications of methods and techniques of nonlinear dynamics to developmental processes. In the second section, we provide a synopsis of current ways of thinking about prototypical developmental processes, namely, pattern formation and pattern differentiation, in various classes of physical and biological systems. It is suggested that efforts to understand the progressive formation and differentiation of patterns in terms of very general principles provide a valuable resource of concepts and methods for students of child development. In the third section, hypotheses about the development of perception-action systems are generated from juxtaposing the themes and conjectures of this special issue with general principles of pattern formation. The hypotheses suggest the possibility of a pattern formation or dynamics approach to child development as an alternative to the conventional approaches emphasizing maturation (nativist), specific learning experiences (empiricist), cognitive stages (Piagetian), and strategies of encoding and retrieval (information processing).     

The Quality of Work Life in NAEYC Accredited and Nonaccredited Early Childhood Programs

This study assessed differences in the work environments of NAEYC accredited and nonaccredited centers. The sample included 5,008 directors, teachers, and support staff who worked in 60 accredited and 320 nonaccredited child care centers in 33 states. Individuals completed the Early Childhood Work Environment Survey assessing their perceptions of different organizational practices. Data were aggregated using the center as the unit of analysis. The results revealed that there were notable differences between accredited and nonaccredited programs relating to the quality of work life for staff. In 10 dimensions of organizational climate, there were statistically significant differences between accredited and nonaccredited programs. The four dimensions which together accounted for the greatest variation in differences were innovativeness, goal consensus, opportunities for professional growth, and clarity. Statistically significant differences were also registered in staffs level of job commitment, staff turnover, and teachers' current and desired levels of decision- making influence.     

A structural model of the effects of preschool attention on kindergarten literacy

Factors that lead to poor achievement in literacy are evident prior to a child beginning kindergarten. In the present study, we examined the importance of including attention in a model for predicting emergent literacy in prekindergarten and subsequent reading abilities in kindergarten. The sample was 250 children attending public prekindergarten and kindergarten. Structural equation modeling was used to test our hypothesis that children??s early literacy skills mediate the relationship between preschoolers?? attention and kindergarten decoding abilities. Using early literacy as a mediator between early attention and later decoding provided a good model fit. Results suggest that attention was integral to the fit of the model and that attention in preschool is related to the development of early literacy skills above and beyond the contribution of maternal education to these skills. The implication of our study is that attention in early childhood should be considered an important part of literacy development.     

Effective formative e-assessment of student learning: a study on a statistics course

The process of formative assessment in universities has the potential to engage students in reflection and to take greater ownership of their learning. We report on a study involving 104 students taking a statistics course in a degree programme in rehabilitation science in Hong Kong. The assessment strategy was redesigned to include a weekly online formative assessment activity for 10 weeks. In this case, it was observed that there was a high participation rate across weeks. An end-of-course online survey was conducted to explore the learning experiences during formative assessment of the cohort, and students reported high satisfaction with the process, particularly how this contributed to a change in their learning approach. Students not only showed regular commitment of time on tasks but also took active steps to find answers for themselves and with their peers.     

Influences of developmental contexts and gender differences on school performance of children and adolescents

This study investigated children and adolescents’ school performance over time focusing on two variables that may influence it: developmental context and gender. The sample comprised 627 participants (M_age?=?11.13, SD?=?1.8), 51% of them female, from grade one to eight, living either with family (n?=?474) or in care institutions (n?=?153). Participants answered individually the Teste de Desempenho Escolar (School Performance Test) and the Structured PRONEX Interview. Findings indicated a main effect of time on school performance (i.e., writing, reading and arithmetic). Furthermore this main effect was further qualified by a time and developmental context interaction and by a time and gender interaction. Interactions revealed that the participants from care institutions attained more significant increases in writing and reading than participants living within a family context; and that girls attained more significant increases in writing than boys. Therefore, school performance progress appears as affected by developmental contexts and gender. The findings reveal how school performance needs to be observed as a multidimensional variable, affected by individual characteristics but also by external ones.     

Maltreatment experiences and associated factors prior to admission to residential care: A sample of institutionalized children and youth in western Kenya

Objectives

This study aims to determine the prevalence of maltreatment experienced by institutionalized children prior to their admission to Charitable Children's Institutions (orphanages) in western Kenya, and to describe their socio-demographic characteristics, reasons for admission, and the factors associated with prior experiences of maltreatment.

Methods

A systematic file review was undertaken in five CCIs. Demographic, prior caregiving settings and maltreatment data were extracted. Forms of maltreatment were recorded according to WHO and ISPCAN guidelines. Logistic regression was used in bivariate and multivariable analyses of factors associated with reasons for placement and forms of maltreatment.

Results

A total of 462 files were reviewed. The median (interquartile range) age of children was 6.8 (5.08) years at admission, 56% were male, and 71% had lost one or both parents. The reasons for admission were destitution (36%), abandonment (22%), neglect (21%), physical/sexual abuse (8%), and lack of caregiver (8%). The majority of child and youth residents had experienced at least one form of maltreatment (66%): physical abuse (8%), sexual abuse (2%), psychological abuse (28%), neglect (26%), medical neglect (18%), school deprivation (38%), abandonment (30%), and child labor (23%). The most common reason for non-orphans to be admitted was maltreatment (90%), whereas the most common reason for orphans to be admitted was destitution (49%). Girls (adjusted odds ratio, AOR: .61, 95% CI: .39–.95) and orphans (AOR: .04, 95% CI: .01–.17) were both independently less likely to have a history of maltreatment irrespective of whether it was the reason for admission. Children whose primary caregiver had not been a parent (AOR: .36, 95% CI: .15–.86) and orphans (AOR: .17, 95% CI: .06–.44) were less likely to have been admitted for maltreatment, while children who were separated from siblings were more likely to have been admitted for maltreatment (AOR: 1.62, 95% CI: 1.01–2.60).

Conclusions

The high prevalence of maltreatment prior to admission, particularly among nonorphans, suggests the need for better child abuse and neglect prevention programs in communities, and psychosocial support services in institutions. The significant proportion of children admitted for poverty, predominantly among orphans, indicates that community-based poverty-reduction programs might reduce the need for institutionalization.     

Is there something wrong with intellectual capital management models?

During the recent years the intellectual capital (IC) literature has produced tens of models to support the various IC management (ICM) activities, such as identification, measurement, valuation, acquisition and reporting IC. However, the practice of applying these models seems to be a fairly new issue in many organisations. The gap between research and practice (i.e. not many organisations seem to be applying ICM models) may result from several issues. This paper approaches the gap from two perspectives. First, the paper questions the applicability of ICM models. Second, although IC as a research theme is quite immature many management models that also include some of the aspects of IC have been developed within general management disciplines. Thus, this study examines whether traditional management models may also be suitable for ICM. The two questions are answered by using four single cases in which action research projects were carried out.