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 ...     

Challenges to the Cattell-Horn-Carroll Theory: Empirical,Clinical, and Policy Implications

ABSTRACT

The Cattell-Horn-Carroll (CHC) taxonomy of cognitive abilities married John Horn and Raymond Cattell’s Extended Gf-Gc theory with John Carroll’s Three-Stratum Theory. While there are some similarities in arrangements or classifications of tasks (observed variables) within similar broad or narrow dimensions, other salient theoretical features and statistical methods used for examining and supporting them are in direct opposition. In this article, the theoretical disagreements between Carroll and Cattell-Horn and theoretical incongruencies between their models are delineated, which raises substantive challenges to CHC. Additionally, there are practical and substantial measurement obstacles that further threaten practical application of CHC. We conclude that the problems are due to some fundamental differences that likely will not change, so call for an annulment of this arranged but unhappy marriage.     

An Examination of Sport Participation Tracking and Adult Physical Activity for Participants of the Michigan State University Motor Performance Study

ABSTRACT

Research tracking sport participation from youth to adulthood is relatively rare, as is research that tracks youth sport participation with regard to adult physical activity (PA) levels, especially in the United States. Aims of this study were: 1) To investigate the degree to which sport participation tracked across youth, adolescence, and early adulthood in a sample of participants from the Michigan State University Motor Performance Study (MPS), and 2) Determine if differences existed in their levels of adult PA relative to prior sport participation. In total, 256 (60.8%) former participants from the MPS completed follow-up surveys regarding routine sport participation and PA across the previous year. Sport participation tracked consistently from youth to college. Further, regardless of the level of youth sport participation, adult leisure time PA was relatively consistent among groups. Although the study did not directly test the influence of the MPS on subsequent adult outcomes, our findings suggest that participants’ past sport participation was not a good predictor of adult PA for those who were involved in a program that emphasized fundamental motor skills in youth. Further investigation of such programs can help to better inform their influence on adult PA.     

Therapeutic support for young people with learning difficulties: what enables effective practice?

Supporting children and young people’s mental health is a central aim of the UK government policy, with those with learning difficulties a particularly vulnerable group. This systematic review of research uses published literature to explore how access and participation in therapy might be facilitated for young people with learning difficulties. Twelve studies published 2000-2019 were identified, which described the experiences of access to, and participation in therapy for people with learning difficulties, although notably most of these involved adults. Findings indicated eight themes: pre-therapy, careful contracting, therapy is hard, idiosyncratic needs, therapeutic relationship, group therapy, reviewing therapy and it changed my life. These were organized into three chronological stages: setting up of therapy; therapeutic processes; and therapeutic outcomes. A number of strategies that can promote access and participation are suggested for professionals working therapeutically with young people with learning difficulties, around contracting, clear communication, the therapeutic alliance and the ending of therapy.     

Teacher MA attainment rates, 1970–2000

The share of female teachers in the U.S. with an MA more than doubled between 1970 and 2000. This increase is puzzling, as it is much larger than that of other college-educated women, and it occurred over a period of declining teacher aptitude. I estimate the contribution of changes in teacher demographic characteristics, increases in the returns to an MA, and changes in teacher certification requirements to increases in teacher MA attainment rates. I find that the majority of the rise in attainment not attributable to secular trends and increases in the average age of teachers can be explained by increases in the returns to an MA among teachers. The increase in MA returns among teachers presents a second puzzle, as there is little evidence that master's degrees increase teacher productivity.