Changes in ankle work,foot work,and tibialis anterior activation throughout a long run

Background:The ankle and foot together contribute to over half of the positive and negative work performed by the lower limbs during running.Yet,little is known about how foot kinetics change throughout a run.The amount of negative foot work may decrease as tibialis anterior(TA)electromyography(EMG) changes throughout longer-duration runs.Therefore,we examined ankle and foot work as well as TA EMG changes throughout a changing-speed run.Methods:Fourteen heel-striking subjects ran on a treadmill ...     

Missing children: how Chilean schools evaded accountability by having low-performing students miss high-stakes tests

Educational Assessment, Evaluation and Accountability - High-stakes testing pressures schools to raise test scores, but schools respond to pressure in different ways. Some responses produce real,...     

Implementation of approach to compute the Lyapunov characteristic exponents for continuous dynamical systems to higher dimensions

A general method for accurately computing the Lyapunov characteristic exponents (LCEs) of continuous dynamical systems has been developed in [10]. In this paper, this method is extended to implementations on systems of arbitrary dimensions. An accurate implementation of the extension of the method to compute LCEs that uses available numerical techniques is presented for systems of arbitrary dimensions. Previously in [10], the original approach had only been implemented for general systems of up to dimension three. Closed form expressions for the exponential of skew symmetric matrices of order 4 and 5 will be presented. These formulas are used to obtain an accurate and efficient implementation of the method for dynamical systems of dimensions 4 and 5. Numerical examples illustrating the accuracy of the implementations are presented.     

Cultural Genocide Through Mainstream Media: A Brief Critical Analysis

While the U.S. mainstream media continues to exercise its right of way in the American landscape, the predominant culture faces a population and popularity decrease. Diversity is slowly finding a perennial nest for growth, although minorities are still being shelled by mainstream media that consciously and unconsciously make the attack a priority in their news and entertainment properties. This article provides an overview of the cultural genocide caused by mainstream media, considering it is in the hand of the hegemonic group that finds it necessary to condemn anything that is different in a society that is pluralistic by nature.     

Correlates of adjustment to aging among the young-old and the oldest-old: A comparative analysis

This study aims to compare the correlates of adjustment to aging (AtA) reported by young-old and oldest-old adults and to build two structural models to explore the correlates of AtA for these two age groups. A cross-national study encompassing a community-dwelling sample of 823 older adults aged 65 years and older was undertaken. Several measures were employed to assess AtA, subjective well-being, and sense of coherence. A questionnaire to determine socio-demographic (sex, age, professional and marital status, education, household, adult children, family’s annual income, living setting, and self-reported spirituality), lifestyle and health-related characteristics (perceived health, recent disease, medication, and leisure) was also used. Structural equation modeling was employed to investigate a structural model of AtA, comprising socio-demographic, lifestyle, and health-related variables, as well as SWB and SOC for both groups. Leisure was the most significant correlate of AtA for the young-old (β = .422; p < .001) while self-reported spirituality was the most significant correlate of AtA for the oldest-old (β = .711; p < .001). Significant correlates explain 67.8% and 73.1% of the variability of AtA, respectively. The results presented in this study highlighted different perspectives of AtA, outlined in two structural models, for the groups, and the need of addressing the differences between these, when implementing health care interventions, in particular the relevance of leisure and self-reported spirituality.     

Behavior Regulation and Early Math and Vocabulary Knowledge in German Preschool Children

Research Findings: Behavior regulation, including paying attention, remembering instructions, and controlling action, contributes to children's successful adaptation to and functioning in preschool and school settings. This study examined the development of behavior regulation in early childhood and its potential contribution to individual differences in children's early knowledge (mathematics and vocabulary). Sixty German preschool children were administered a direct observational measure of behavior regulation, the Head-to-Toes Task, and a standardized test to assess early mathematics and vocabulary. Results revealed significant gains in behavior regulation between of 3 and 4 years of age. Moreover, early gender differences were found, with girls outperforming boys at age 4. Behavior regulation was significantly related to performance on the academic tasks, but the pathways to math and vocabulary knowledge differed. Practice or Policy: Discussion focuses on the role of behavior regulation in early academic achievement.     

Mediation Analysis in a Latent Growth Curve Modeling Framework

This article presents several longitudinal mediation models in the framework of latent growth curve modeling and provides a detailed account of how such models can be constructed. Logical and statistical challenges that might arise when such analyses are conducted are also discussed. Specifically, we discuss how the initial status (intercept) and change (slope) of the putative mediator variable can be appropriately included in the causal chain between the independent and dependent variables in longitudinal mediation models. We further address whether the slope of the dependent variable should be controlled for the dependent variable's intercept to improve the conceptual relevance of the mediation models. The models proposed are illustrated by analyzing a longitudinal data set. We conclude that for certain research questions in developmental science, a multiple mediation model where the dependent variable's slope is controlled for its intercept can be considered an adequate analytical model. However, such models also show several limitations.