Ice hockey shoulder pad design and the effect on head response during shoulder-to-head impacts

Ice hockey body checks involving direct shoulder-to-head contact frequently result in head injury. In the current study, we examined the effect of shoulder pad style on the likelihood of head injury from a shoulder-to-head check. Shoulder-to-head body checks were simulated by swinging a modified Hybrid-III anthropomorphic test device (ATD) with and without shoulder pads into a stationary Hybrid-III ATD at 21 km/h. Tests were conducted with three different styles of shoulder pads (traditional, integrated and tethered) and without shoulder pads for the purpose of control. Head response kinematics for the stationary ATD were measured. Compared to the case of no shoulder pads, the three different pad styles significantly (p < 0.05) reduced peak resultant linear head accelerations of the stationary ATD by 35–56%. The integrated shoulder pads reduced linear head accelerations by an additional 18–21% beyond the other two styles of shoulder pads. The data presented here suggest that shoulder pads can be designed to help protect the head of the struck player in a shoulder-to-head check.     

Effects on muscle strength,maximal jump height,flexibility and postural sway after soccer and Zumba exercise among female hospital employees: a 9-month randomised controlled trial

This 9-month randomised controlled workplace physical activity trial investigated the effects of soccer and Zumba exercise, respectively, on muscle strength, maximal jump height, sit-and-reach flexibility and postural sway among female workers. A total of 107 female hospital employees aged 25–63 were cluster-randomised to a soccer group, a Zumba group or a control group. Training was conducted outside working hours as two to three 1-h weekly sessions the first 3 months and once a week the last 6 months. Tests were conducted at baseline, after 3 and 9 months. The soccer group improved maximal neck extension strength both after 3 (1.2 kg; P < 0.05) and 9 months (1.7 kg; P < 0.01) compared to the control group. The Zumba group improved maximal trunk extension strength (3.1 kg; P = 0.04) after 3 months, with improvements in postural sway velocity moment (?9.2 mm²/s; P < 0.05) and lower limb lean mass (0.4 kg; P < 0.05) after 9 months. No significant intervention effects were revealed in vertical jump height or sit-and-reach flexibility. The present study indicates that workplace-initiated soccer and Zumba exercise may be beneficial for improvement of the neck and trunk strength, which may have preventive effects with regard to future perceived muscle pain in the respective body regions. Furthermore, the Zumba group revealed positive effects on lower limb lean mass and postural sway compared to the control group.     

An ecological analysis of a preschool mastery climate physical education programme

Background: Previous studies of mastery motivational climates within physical education have reported that providing students with opportunities to become self-directed leads to a number of positive outcomes, including skill attainment and increased perceptions of ability. Nonetheless, within all of these studies, there has been no account of the teaching/learning process or the behaviour of the students and teachers within the various interventions.

Purpose: The purpose of this study was to provide a micro-analysis of life in a mastery climate which was grounded in the classroom ecology paradigm.

Participants and setting: The participants in this study were 13 children (11 boys and 2 girls) all aged 4 years at the commencement of the programme. The children were attendees at a day-care centre that serves mostly African-American children from the local community who are environmentally at risk for developmental delay and poor health. The teacher in this study was a faculty member at the university where the programme took place. For 30 minutes each Tuesday and Thursday, the children participated in a programme of motor skill instruction that was based upon the key principles of a mastery-motivational climate. Selected station activities were designed to promote the acquisition of locomotor and object control skills.

Methods: A mixed-methods approach was taken, with data sources including interviews with the teacher, and an analysis of the ecology of the gymnasium using a modified version of the task structure system. Focus was placed upon the task goals, the teacher's accountability strategies, as well as task accomplishment in both the managerial and instructional task systems.

Findings: The key finding from this study was an appreciation of how time is a significant factor in the ways in which children initially responded to and eventually embraced the freedoms afforded to them in a mastery climate. Of particular note, the results show substantial differences in the children's lesson engagement not only across time, but also within lessons themselves. It is hypothesized that as they progressed through the programme, the children not only were more able to identify the demands of the task but were also able to filter out extraneous signals that might promote off-task or inappropriate behaviour.

Conclusions: The design of this study reinforced the value of adopting an ecological analysis of life in a mastery climate. Further, the results of the study showed the value of examining young children's engagement over a lengthy intervention. While such climates are expected to have lower levels of engagement and higher levels of off-task behaviour than more teacher-directed formats, by the end of the study the children were able to achieve levels of appropriate task engagement above 80% of lesson time.     

Development of a performance assessment task and rubric to measure prospective secondary school mathematics teachers’ pedagogical content knowledge and skills

The purpose of this paper is to share a performance assessment task and rubric designed to assess secondary school mathematics preservice teachers’ pedagogical content knowledge and skills. The assessment task and rubric were developed in collaboration with five education faculty, four arts and sciences faculty, and four high school teachers over a period of one year. Over this period, the group met more than 15 times and designed an assessment task and rubric to measure secondary school preservice teachers’ pedagogical content knowledge and skills. The assessment task and rubric were piloted at the end of the year and extensively revised using the pilot data. The redesigned task and rubric were successfully carried out in the second and subsequent years. Other teacher education programs can benefit from this assessment of teacher candidates’ pedagogical content knowledge and skills.     

Labour perspectives on the new politics of skill and competency formation: International reflections

Skill/competency approaches to workplace-based policy seek to assess and train for discrete individual competencies with the goal of increasing employability and productivity. These approaches have become increasingly prominent across a range of advanced capitalist countries. A substantial critique has emerged over this same period regarding issues of instrumentality and social control, as well as the failure of skill/compentancy approaches to articulate a meaningful understanding of human learning capacities. In this article, these critical perspectives are clarified further by a review of contributions to understanding the skill/competence question emerging from sociology of work literature. Building from these critiques, this article outlines recent experiences with and perspectives on skill/competency frameworks amongst different national labour movements. Included in this outline is a more detailed, comparative analysis of Norway and Canada; here we see the lofty ‘new’, ‘knowledge economy’ rhetoric — in two countries where one might expect to see it blossom in application — brought down to earth by the realities of industrial relations, employer intransigence and intra-labour movement differences. ‘Skill/competence’ proves to be a floating signifier that, amongst both employers and labour, stands as a proxy for ‘power/control’ struggles. Degenerating in this way, from a labour perspective, the new politics of skill/competency formation is seen to have spiraled toward irrelevance in Norway and Canada; awaiting, in both countries, a re-invigoration through attention to changes in the participatory structure of the labour process itself.     

Parental teaching styles in an open-ended teaching-learning environment

The present study extends earlier work on parental teaching style by making the task to be completed less structured, extending parent-child interaction over a 2 week time period, and equalizing the expertise of the parent relative to the child. Additionally, the study examines the effects of parental intrusiveness on a subsequent task. Subjects were 22 Caucasian middle class parent-child dyads. Audiorecordings were taped over a 2-week period while dyads were learning aspects of Logo computer programming. Even in this prolonged nonspecific learning situation, in which parents were encouraged to proceed at the child's pace, parents were overwhelmingly directive. Additionally, children of directive parents performed best on a subsequent generalization task.     

Self‐regulation strategies improve self‐discipline in adolescents: benefits of mental contrasting and implementation intentions

Adolescents struggle with setting and striving for goals that require sustained self‐discipline. Research on adults indicates that goal commitment is enhanced by mental contrasting (MC), a strategy involving the cognitive elaboration of a desired future with relevant obstacles of present reality. Implementation intentions (II), which identify the action one will take when a goal‐relevant opportunity arises, represent a strategy shown to increase goal attainment when commitment is high. This study tests the effect of mental contrasting combined with implementation intentions (MCII) on successful goal implementation in adolescents. Sixty‐six 2nd‐year high school students preparing to take a high‐stakes exam in the fall of their third year were randomly assigned to complete either a 30‐minute written mental contrasting with implementation intentions intervention or a placebo control writing exercise. Students in the intervention condition completed more than 60% more practice questions than did students in the control condition. These findings point to the utility of directly teaching to adolescents mental contrasting with implementation intentions as a self‐regulatory strategy of successful goal pursuit.     

Die Familie als informeller Bildungsort

Zusammenfassung Der Frage nach den Steigerungsm?glichkeiten der (informellen) „Grundbildung“ und der F?rderung von Basiskompetenzen wird aus bildungsbiographischer Perspektive nachgegangen, indem die familiale Bildungswirklichkeit in ihrem Wechselverh?ltnis zur schulischen Bildungswirklichkeit anhand eines Fallbeispiels dargestellt wird. Am Beispiel der Vermittlung und Aneignung von information literacy wird gezeigt, dass es unumg?nglich ist, in der schulischen Bildungswirklichkeit von einer Kulturrelativit?t und Kulturgebundenheit von information literacy als wichtigem Element von informeller Bildung auszugehen, die an unterschiedlichen Bildungsorten erworben wird und eine entsprechende Vernetzung der Bildungsorte voraussetzt. Um Bildungsarmut zu verhindern und m?glichst für alle Menschen die Voraussetzungen für die Gestaltung eines eigenen Lebenslaufs und die Entwicklung einer verst?ndigen kulturellen Teilhabe- und sozialen Anschlussf?higkeit zu schaffen, muss sich, so die These, die Institution Schule mehr für informelle Bildung und die p?dagogische Bearbeitung von kultureller Differenz sowie den Umgang mit Heterogenit?t ?ffnen, damit der oft diskriminierende Umgang mit kultureller und sozialer Differenz in der Schule nicht in eine fürsorgliche (p?dagogische) Belagerung und Entmündigung der Schüler durch die Schule umschl?gt. Dabei ist es wichtig, die informellen Bildungsleistungen der Familie anzuerkennen und weiter zu entwickeln und in Verbindung mit der verst?rkten F?rderung von Erziehungspartnerschaften zwischen Eltern und p?dagogischen Fachkr?ften darauf hinzuarbeiten, die Grundbildung und den Erwerb von notwendigen Basiskompetenzen zu st?rken und das schulische Abwertungsdilemma von au?erschulisch erworbenen informellen Bildungsgehalten „f?rderdidaktisch“ zu bearbeiten.      

The creatine content of Creatine Serum™ and the change in the plasma concentration with ingestion of a single dose

Three samples of Creatine Serum? ATP Advantage from Muscle Marketing USA, Inc. were assayed for creatine by two different techniques by four independent laboratories, and for creatinine by two different techniques by two laboratories. A further sample was assayed for phosphorylcreatine. Dry weight and total nitrogen were also analysed. Six male volunteers ingested in random order, over 3 weeks: (A) water; (B) 2.5?g creatine monohydrate (Cr?·?H₂O) in solution; and (C) 5?ml Creatine Serum? (reportedly containing an equivalent amount of Cr?·?H₂O). Blood samples were collected before and up to 8?h after each treatment and plasma was analysed for creatine and creatinine. Eight-hour urine samples were analysed for creatine. Ingestion of 2.5?g creatine monohydrate in solution resulted in a significant increase in plasma creatine (from 59.1±11.8?μmol?·?l^?1 to 245.3±74.6?μM μmol?·?l^?1; mean±s) and urinary creatine excretion. No increase in plasma or urinary creatine or creatinine was found on ingestion of Creatine Serum? or water. Analysis showed 5?ml of Creatine Serum? to contain <10?mg Cr?·?H₂O and approximately 90?mg creatinine. Phosphorylcreatine was not detectable and only a trace amount of phosphorous was present. Total nitrogen analysis ruled out significant amounts of other forms of creatine. We conclude that the trace amounts of creatine in the product would be too little to affect the muscle content even with multiple dosing.     

Key to Freshwater Algae: A Web-based Tool to Enhance Understanding of Microscopic Biodiversity

The Freshwater Ecology Laboratory at Connecticut College has developed an interactive, Web-based identification key to freshwater algal genera using the Lucid Professional and Lucid 3 software developed by the Centre for Biological Information Technology at the University of Queensland, Brisbane, Australia. The Key to Freshwater Algae was funded by the National Science Foundation (Award #CCLI-0229531) to encourage awareness of microscopic diversity through a creative, investigative approach to learning. Users may answer questions in any order to quickly and efficiently narrow down the list of taxa to only those that match the characteristics they have chosen. All characters and terms are clearly explained for ease of use by those unfamiliar with the algae. This non-hierarchical, user-friendly key is linked to Web pages containing a wealth of resources, including images, movies, and information about the morphology, ecology, and reproduction of each organism. These materials are especially well suited for classroom use in conjunction with cultures purchased from the Carolina Biological Supply Company, a popular distributor of biological materials. Cultures from the Carolina Biological Supply Company representing nearly 75 freshwater genera from a variety of algal groups were observed and photographed using high resolution digital imaging to fully document cellular structure and highlight distinguishing features. High quality video footage of each taxon incorporating titles, diagrams, and structural terminology was outputted as QuickTime movies, on DVD, and on VHS cassettes. The Key to Freshwater Algae and supplemental materials are available online at http://silicasecchidisk.conncoll.edu to provide an innovative alternative to traditional dichotomous keys that is particularly appropriate for introducing students in undergraduate life science courses to the algal groups and genera.