Effects of treadmill running and fatigue on impact acceleration in distance running

The effects of treadmill running on impact acceleration were examined together with the interaction between running surface and runner's fatigue state. Twenty recreational runners (11 men and 9 women) ran overground and on a treadmill (at 4.0 m/s) before and after a fatigue protocol consisting of a 30-minute run at 85% of individual maximal aerobic speed. Impact accelerations were analysed using two lightweight capacitive uniaxial accelerometers. A two-way repeated-measure analysis of variance showed that, in the pre-fatigue condition, the treadmill running decreased head and tibial peak impact accelerations and impact rates (the rate of change of acceleration), but no significant difference was observed between the two surfaces in shock attenuation. There was no significant difference in acceleration parameters between the two surfaces in the post-fatigue condition. There was a significant interaction between surface (treadmill and overground) and fatigue state (pre-fatigue and post-fatigue). In particular, fatigue when running overground decreased impact acceleration severity, but it had no such effect when running on the treadmill. The effects of treadmill running and the interaction need to be taken into account when interpreting the results of studies that use a treadmill in their experimental protocols, and when prescribing physical exercise.     

Entryway into the child protection system: The impacts of child maltreatment reporting policies and reporting system structures

This study was designed to assess the impacts of maltreatment reporting policies and reporting system structures on four aspects of entry into the child protection system (the maltreatment referral rate, the percentage of referrals screened in for investigation, the screened-in report rate and the substantiated report rate). Using secondary data from several sources, eight multiple linear regression models were created and analyzed. Results from a sample of 44 states indicated significant effects for system structure but no effects for reporting policies. Specifically, states with decentralized reporting system structures were significantly more restrictive in access than other states. These results have implications for child welfare administrators and policymakers seeking to maximize access for maltreated children and their families.     

The effects of gender‐role expectations upon perceptions of communicative competence

Several researchers have proposed that power, rather than gender, accounts for women using more powerless language than men. The present study examined the specific interaction context of bargaining and compared power with gender as potential predictors of the use of threats, one particular form of powerful language. Grounded in an interactional/social exchange view of power as dependence in social transactions, this study represented a marked departure from past studies of gender‐based language. The results largely supported power rather than gender as the best predictor of the use of powerful language in an interactional context involving bargaining.     

Working Together: Preparing the Next Generation of Highly Qualified Middle-School STEM Teachers

In response to the demand to produce highly qualified teachers to fill teacher vacancies in high-need middle school areas while simultaneously strengthening the teacher preparation process, this article highlights how an innovative partnership with a very large school district and multiple colleges within a metropolitan university resulted in a collaboration to rethink and retool teacher preparation for the next generation of middle school STEM teachers.     

Undergraduate Students' Perceptions of an Inquiry-Based Physics Course

The purpose of this study was to examine middle childhood students' perceptions of the learning environment in a reform-based physics course. A lecture-style, introductory physics course was modified into an inquiry-based course designed for preservice middle childhood teachers through the collaborative efforts of faculty in the Colleges of Education and Arts and Sciences. Focus group interviews were conducted to examine students' perceptions. The results suggested that the students initially felt a level of frustration with a new constructivist experience; however, they were able to embrace the inquiry method and expressed a desire for additional specialized content courses for preservice teachers.     

Phubbing friends: Understanding face threats from,and responses to,friends’ cell phone usage through the lens of politeness theory

The study examined friends’ phubbing (i.e., the act of snubbing a relational partner by using a cell phone in his/her presence), through the lens of politeness theory. Quantitative and qualitative data from 404 participants revealed that, although most accepted the behavior and did not view it as a face-threatening act (FTA), others perceived it as face threatening, particularly of positive face, eliciting varied negative emotions. Specific behaviors such as repeatedly looking at the phone or playing a game alone had the highest positive face-threat scores. Most chose not to respond to the FTA. Results indicated that increased perception of the behavior as face threatening was associated with higher reported likelihood of responding with politeness strategies, although no specific strategy emerged as the preferred response.     

Urban High School Students’ IT/STEM Learning: Findings from a Collaborative Inquiry- and Design-Based Afterschool Program

This exploratory study examines the impact of a collaborative inquiry- and design-based afterschool program on urban high school students’ IT/STEM learning—using information technology (IT) within the context of science, technology, engineering, and mathematics (STEM). The study used a mixed methods design, involving 77 participants within two cohort groups, each participating in an eighteen-month intervention period. Data were collected from the pre- and post-surveys, analysis of the participants’ IT/STEM projects, external evaluation reports, and follow-up interviews. Findings indicate that the program had a significant impact on students’ technology and IT/STEM skills, frequency of technology use, and understanding of IT use in STEM-oriented fields. Some degree of impact on attitude changes toward IT/STEM and career aspirations in these fields was also in evidence. The study demonstrates that IT/STEM experiences supported through technology-enhanced, inquiry- and design-based collaborative learning strategies have significant impact on urban high school students’ IT/STEM learning. Effect of afterschool programs on attitude changes and IT/STEM-related career aspirations of urban high school students are recommended areas of further investigation.     

Family Stress Processes and Children's Self-Regulation

Economic hardship can affect children's development through child–caregiver interactions, which may mediate cascading effects of other family stress processes. This study examined, simultaneously, the relations of financial strain, caregiver general stress, and child–caregiver conflict—each measured at two time points—with child self-regulatory outcomes in a high-poverty sample (age 5–7 years; n = 343). Increase in child–caregiver conflict mediated negative relations between other processes and development of executive function. In contrast, only increase in financial strain had direct, negative association with development of delay of gratification and did not significantly mediate relations between any other process and children's outcomes. Results have implications for understanding effects of family stress on self-regulatory outcomes and for interventions with low-income families.