Stress responses during aerobic exercise in relation to motivational dominance and state

We examined the hypothesis that congruence between motivational dominance and state results in optimal psychological responses and performance during exercise. Twenty participants (10 telic dominant and 10 paratelic dominant) rated their stress at 5 min intervals as they cycled on an ergometer at gas exchange threshold for 30 min in both telic and paratelic state manipulated conditions. Participants then performed a test to exhaustion at a resistance equivalent to 110% of VO(2max). The hypothesized interaction between condition and dominance was significant for internal tension stress, as paratelic dominants were more stressed than telic dominants when exercising in the telic state and telic dominants were more stressed than paratelic dominants when exercising in the paratelic state. Similarly, the condition × dominance interaction for internal stress discrepancy was significant, as paratelic dominants reported greater internal stress discrepancy exercising in the telic compared with the paratelic state. Findings are discussed in relation to the application of reversal theory for understanding stress responses during aerobic exercise.     

γ射线爆

新的观测结果阐释了宇宙中威力最大的那些爆炸。     

年轻宇宙中的星系

通过将遥远的原始星系与近邻的较古老星系相对比，天文学家希望确定星系是如何形成和演化的。     

Digital design of scaffold for mandibular defect repair based on tissue engineering

Mandibular defect occurs more frequently in recent years, and clinical repair operations via bone transplantation are difficult to be further improved due to some intrinsic flaws. Tissue engineering, which is a hot research field of biomedical engineering, provides a new direction for mandibular defect repair. As the basis and key part of tissue engineering, scaffolds have been widely and deeply studied in regards to the basic theory, as well as the principle of biomaterial, structure, design, and fabrication method. However, little research is targeted at tissue regeneration for clinic repair operations. Since mandibular bone has a special structure, rather than uniform and regular structure in existing studies, a methodology based on tissue engineering is proposed for mandibular defect repair in this paper. Key steps regarding scaffold digital design, such as external shape design and internal microstructure design directly based on triangular meshes are discussed in detail. By analyzing the theoretical model and the measured data from the test parts fabricated by rapid prototyping, the feasibility and effectiveness of the proposed methodology are properly verified. More works about mechanical and biological improvements need to be done to promote its clinical application in future.     

Outcomes from building system courseware for teaching and testing in a discipline-based human structure curriculum

This study investigated the educational benefits of system-based lecture notes and interactive learning objects in a peripheral nervous system component of a traditional first-year medical school human anatomy course. The impetus for the investigation was anecdotal evidence suggesting enhanced learner satisfaction with the learning resources. Retrospective review of existing data from 2006 to 2009 was undertaken to quantify (1) the effects of Web-based system courseware on examination item performance, and (2) differences among learner opinions regarding the benefit level of the five different types of interactive learning objects as evaluated by instructional design questionnaires. Interactive patient-based case studies (IPCS) and review games (Games), simulated interactive patients (SIP), flashcards, and unit quizzes (Quizzes) developed in-house have been peer-reviewed and published in MedEdPORTAL. Statistics included one-way analysis of variance, Tukey's post hoc test, and power meta-analysis (d). Examination item analysis scores remained significantly higher (P ≤ 0.05; d = 0.3938) for learners receiving the instructional treatment incorporating system-based lecture notes and interactive learning objects than for those not receiving this treatment. Using questionnaires with a five-point Likert scale, students reported favorably on the benefit level of all learning objects. They rated the SIP and IPCS significantly higher (P ≤0.05) and games significantly lower (P ≤ 0.05) than in previous years, indicating a change in learner preferences. This study reaffirms that online system-based instructional techniques improve student examination performance and overall student satisfaction. Learners indicated stronger preferences for SIP and IPCS over exercises encouraging passive memorization of anatomical content.     

Child development and the PITS: simple questions, complex answers, and developmental theory. Person in the Street

The enormous popular interest in the field of child development makes it incumbent upon developmental scientists to convey with care the complexity of development lest oversimplified popular accounts gain credibility. Recent attempted models of development do include the range of variables and complexities that need to be accommodated in accounting for development. A model is presented here that incorporates many of the elements of recent models but elaborates on the role of experience in relation to the constitutional, cultural, economic, and social factors that contribute to advantages and disadvantages in children's development. The importance of accommodating data from prior theoretical perspectives and the importance of the contributions from neuroimaging studies are discussed as they are critical for successful theory building in the field of child development.     

Interparental conflict and child adjustment: testing the mediational role of appraisals in the cognitive-contextual framework

Children's appraisals of interparental conflict consistently have been associated with adjustment problems, but the processes that give rise to this association are not well understood. This paper proposes that appraisals of threat and self-blame mediate the association between children's reports of interparental conflict and internalizing problems, and tests this mediational hypothesis in two samples of children, one drawn from the community (317 ten- to fourteen-year-olds) and the other from battered women's shelters (145 ten- to twelve-year-olds). Results indicate that perceived threat mediates the association between interparental conflict and internalizing problems for boys and girls in both samples, and self-blame mediates this association for boys in both samples and girls in the shelter sample. Perceived threat and self-blame do not mediate links with externalizing problems, and there is no evidence of a moderating effect of appraisals on the association between conflict and child adjustment. Implications for understanding the mechanism by which exposure to interparental conflict could lead to child maladjustment are discussed.