Effects of unsteady conditions on propulsion generated by the hand’s motion in swimming: a systematic review

The understanding of swimming propulsion is a key factor in the improvement of performance in this sport. Propulsive forces have been quantified under steady conditions since the 1970s, but actual swimming involves unsteady conditions. Thus, the purpose of the present article was to review the effects of unsteady conditions on swimming propulsion based on studies that have compared steady and unsteady conditions while exploring their methods, their limitations and their results, as well as encouraging new studies based on the findings of this systematic review. A multiple database search was performed, and only those studies that met all eligibility criteria were included. Six studies that compared steady and unsteady conditions using physical experiments or numerical simulations were selected. The selected studies verified the effects of one or more factors that characterise a condition as unsteady on the propulsive forces. Consequently, much research is necessary to understand the effect of each individual variable that characterises a condition as unsteady on swimming propulsion, as well as the effects of these variables as a whole on swimming propulsion.     

Child emotional security and interparental conflict

Guided by the emotional security hypothesis developed by Davies & Cummings (1994), studies were conducted to test a conceptual refinement of children's adjustment to parental conflict in relation to hypotheses of other prominent theories. Study 1 examined whether the pattern of child responses to simulations of adult conflict tactics and topics was consistent with the emotional security hypothesis and social learning theory in a sample of 327 Welsh children. Supporting the emotional security hypothesis, child reports of fear, avoidance, and involvement were especially prominent responses to destructive conflict. Study 2 examined the relative roles of child emotional insecurity and social-cognitive appraisals in accounting for associations between parental conflict and child psychological symptoms in a sample of 285 Welsh children and parents. Findings indicated that child emotional insecurity was a robust intervening process in the prospective links between parental conflict and child maladjustment even when intervening processes proposed in the social-cognitive models were included in the analyses. Studies 3 and 4 explored pathways among parental conflict, child emotional insecurity, and psychological adjustment in the broader family context with a sample of 174 children and mothers. Supporting the emotional security hypothesis, Study 3 findings indicated that child insecurity continued to mediate the link between parental conflict and child maladjustment even after specifying the effects of other parenting processes. Parenting difficulties accompanying interparental conflict were related to child maladjustment through their association with insecure parent-child attachment. In support of the emotional security hypothesis, Study 4 findings indicated that family instability, parenting difficulties, and parent-child attachment insecurity potentiated mediational pathways among parental conflict, child insecurity, and maladjustment. Family cohesiveness, interparental satisfaction, and interparental expressiveness appeared to be protective factors in these mediational paths. No support was found for the social learning theory prediction that parent-child warmth would amplify associations between parental conflict and child disruptive behaviors.     

Preschool outcomes of children of depressed mothers: role of maternal behavior,contextual risk,and children's brain activity

Children of depressed mothers are at risk for behavioral and emotional problems. Infants of depressed mothers exhibit behavioral disturbances and atypical frontal brain activity. The mechanisms by which children develop such vulnerabilities are not clear. Three-year-old children of mothers with (N = 65) and without (N = 59) a history of depression were assessed in terms of behavior problems and brain electrical activity. Children of mothers with chronic depression exhibited lower frontal and parietal brain activation compared with children of mothers without depression and those whose depression remitted. Depressed mothers reported higher contextual risk (e.g., marital discord and stress) and their children had more behavior problems. Children's frontal brain activation and contextual risk level mediated the relation between maternal depression and child behavior problems.     

Follow-up of a preschool epidemiological sample: cross-age continuities and predictions of later adjustment with internalizing and externalizing dimensions of behavior

The continuity of behavioral adjustment from preschool through elementary school and junior high school years was examined. 541 children aged 9-15 years from a preschool epidemiological study were relocated and behavior checklist data obtained. Analyses focused on the relationship between internalizing and externalizing behavior dimensions from the preschool to follow-up periods. It was found that preschool externalizing symptoms were positively correlated with later externalizing and internalizing symptoms in the entire sample. Preschool internalizing symptoms, however, were predictive of later internalizing symptoms only for 2-year-old girls and 5- and 6-year-old boys. Similar results were obtained for clinically disturbed preschoolers. Results are consistent with previous findings regarding the longitudinal continuity of externalizing behavior but are at odds with reports of equal or greater stability of internalizing behavior. Given the magnitude of obtained correlations, even when significant, the results support the view that discontinuity rather than continuity in behavioral adjustment from preschool to later ages is the rule. The importance of examining other mediating variables in the prediction of behavioral adjustment and the need for models of development that encompass both stability and change are discussed.     

Advances in the assessment of social competence: Findings from a preliminary investigation of a general outcome measure for social behavior

This study describes the initial validation of an innovative social‐‐behavioral observational assessment tool that is designed to be used on a repeated basis to assess growth and development of social competence over time to: (a) identify the social functioning of all students, (b) assist in planning support for students at risk, and (c) evaluate the effectiveness of individual and system‐wide interventions. Eighteen first‐grade students were monitored over an 8‐week period using the Initiation‐Response Assessment (IRA) Code. The School Social Behavior Scales, a published teacher rating scale, was included as a criterion measure. Estimates of reliability and criterion‐related validity were calculated for the IRA. The measure's sensitivity to growth over time and between‐group variability were also assessed using hierarchical linear modeling procedures. Results indicate that scores on this measure are stable, and tap constructs similar to those assessed via teacher rating. © 2008 Wiley Periodicals, Inc.     

Learning how to implement and manage SME marketing networks: a qualitative analysis

The theme of SME marketing networks acquires high relevance because of their positive influence over internationalization and market competitiveness. Within this stream of research, how partners learn to implement and manage collaborations has received little attention. This article aims to bridge this gap, first, by analysing the mechanisms partners use throughout their learning process, and, second, by investigating whether this learning process may have an association with the network ability to explore new market opportunities, which is the ultimate objective of SMEs willing to overcome the liability of smallness. The results of this article unveils the different structures, processes and tools, which are used to create new knowledge on how to implement and manage SME marketing networks; furthermore, it suggests that an effective learning process may have a positive association with the exploration of new market opportunities through networks.     

The Legacy of Early Insecurity Histories in Shaping Adolescent Adaptation to Interparental Conflict

This study tested whether the mediational pathway involving interparental conflict, adolescent emotional insecurity, and their psychological problems was altered by their earlier childhood histories of insecurity. Participants included 230 families, with the first of the five measurement occasions occurring when children were in first grade (M_age = 7 years). Results indicated that interparental conflict was associated with increases in adolescent emotional insecurity that, in turn, predicted subsequent increases in their psychological problems. Childhood insecurity predicted adolescent maladjustment 5 years later even after considering contemporaneous family experiences. Moderator findings revealed that adolescents with relatively higher levels of insecurity in childhood evidenced disproportionately greater and reduced levels of insecurity in the context of high and low levels of interparental conflict, respectively.     

Childhood trauma and suicide risk in a sample of young individuals aged 14–35 years in southern Brazil

Suicide is among the main causes of death of people aged between 15 and 44 years old. Childhood trauma is an important risk factor for suicide. Hence, the objective of this study was to verify the relationship between childhood trauma and current suicide risk (suicidal behavior and ideation) in individuals aged 14–35 years, in the city of Pelotas, Brazil. This is a cross-sectional, population-based study. Sample selection was performed by clusters. Suicide risk was evaluated using the Mini International Neuropsychiatric Interview (MINI) and Childhood trauma was assessed with the Childhood Trauma Questionnaire (CTQ). Moreover, the participants responded to a questionnaire concerning socioeconomic status, work, and substance use. The sample was composed of 1,380 individuals. The prevalence of suicide risk was 11.5%. The prevalence figures of childhood trauma were 15.2% (emotional neglect), 13.5% (physical neglect), 7.6% (sexual abuse), 10.1% (physical abuse), and 13.8% (emotional abuse). Suicide risk was associated (p < .001) with gender, work, alcohol abuse, tobacco use, and all types of childhood trauma. The odds of suicide risk were higher in women (OR = 1.8), people who were not currently working (OR = 2.3), individuals who presented alcohol abuse (OR = 2.6), and among tobacco smokers (OR = 3.4). Moreover, suicide risk was increased in all types of trauma: emotional neglect (OR = 3.7), physical neglect (OR = 2.8), sexual abuse (OR = 3.4), physical abuse (OR = 3.1), and emotional abuse (OR = 6.6). Thus, preventing early trauma may reduce suicide risk in young individuals.     

The accountability era in US teacher education: looking back,looking forward

Abstract

In keeping with the theme of the 40th anniversary issue of EJTE, this article looks back and forward at US teacher education accountability. It argues that “holding teacher education accountable” has been the major approach to reforming teacher education in the US for the last two decades, assuming that enhanced teacher education quality depends on vigilant public evaluation and monitoring of outcomes related to teacher education institutions, programs, and teacher candidates. This article looks back at the “era of accountability” by examining five policy, political, and professional developments that contributed to its emergence and strong hold on US teacher education. Looking forward to the future of teacher education accountability in the US, the article argues that we need a new approach – democratic accountability in teacher education – which is based on intelligent professional responsibility for students’ learning including democratic knowledge and skills, strong equity, and genuine collaboration with multiple stakeholders.