Determination of a quantitative parameter to evaluate swimming technique based on the maximal tethered swimming test     

Rafael Soncin  Bruno Mezêncio  Jacielle Carolina Ferreira  Sara Andrade Rodrigues  Rudolf Huebner  Julio Cerca Serrão 《Sports biomechanics / International Society of Biomechanics in Sports》2017,16(2):248-257

The aim of this study was to propose a new force parameter, associated with swimmers’ technique and performance. Twelve swimmers performed five repetitions of 25 m sprint crawl and a tethered swimming test with maximal effort. The parameters calculated were: the mean swimming velocity for crawl sprint, the mean propulsive force of the tethered swimming test as well as an oscillation parameter calculated from force fluctuation. The oscillation parameter evaluates the force variation around the mean force during the tethered test as a measure of swimming technique. Two parameters showed significant correlations with swimming velocity: the mean force during the tethered swimming (r = 0.85) and the product of the mean force square root and the oscillation (r = 0.86). However, the intercept coefficient was significantly different from zero only for the mean force, suggesting that although the correlation coefficient of the parameters was similar, part of the mean velocity magnitude that was not associated with the mean force was associated with the product of the mean force square root and the oscillation. Thus, force fluctuation during tethered swimming can be used as a quantitative index of swimmers’ technique.  相似文献   

Association of physical fitness,body composition,cardiometabolic markers and adherence to the Mediterranean diet with bone mineral density in perimenopausal women. The FLAMENCO project     

Virginia A. Aparicio  Pilar Ruiz-Cabello  Milkana Borges-Cosic  Ana Andrade  Irene Coll-Risco  Pedro Acosta-Manzano 《Journal of sports sciences》2017,35(9):880-887

This study aimed to analyse the association of different components of physical fitness, body composition, cardiometabolic markers and the Mediterranean diet with bone mineral density (BMD) in perimenopausal women, and to test which of these components are independently associated with BMD. The sample comprised 197 perimenopausal women (52.6 ± 4.5 years). Physical fitness was assessed with the “Senior Fitness Test” battery and the handgrip strength and Bruce tests. Fat and lean mass and BMD were measured using dual-energy X-ray absorptiometry. We analysed the markers of metabolic syndrome, C-reactive protein, and components of the Mediterranean diet. Handgrip muscle strength (β = 0.212, P = 0.005), body weight (β = 0.244, P = 0.001), BMI (β = 0.180, P = 0.011) and lean mass (β = 0.379, P < 0.001) were positively associated with BMD. No associations were observed between cardiometabolic markers or the Mediterranean diet with BMD (all P > 0.05). When all relevant indicators of BMD were simultaneously considered, lean mass was the only 1 showing an independent association with BMD (β = 0.392, P < 0.001), explaining 14% of the BMD variability. In conclusion, muscle strength might be a marker of BMD in perimenopausal women. However, lean mass was the only factor independently associated with BMD. Future research to determine whether increasing lean mass through specific exercise-based interventions contributes to increasing BMD is warranted.  相似文献   

Transition to Science Teacher Educator: Tensions Experienced while Learning to Teach Lesson Sequencing     

Heidi Wiebke  Meredith Park Rogers 《Studying Teacher Education》2014,10(3):222-238

This self-study investigated the tensions that I (Heidi) encountered when teaching elementary preservice teachers how to develop a coherent sequence of five science lessons. Four lesson planning components guided me in developing a series of lessons to support the preservice teachers with this exercise. Employing self-study methodology, data sources included preservice teachers' artifacts, an audio-recording of the preservice teachers discussing the planning of their lesson sequence, and two reflection journals, one kept personally and one kept collaboratively with my co-author and critical friend (Meredith). Findings indicate that a tension of telling and growth developed gradually during the three weeks of teaching. The collaborative journal revealed that this tension was promoted by two other tensions: confidence and uncertainty, and planning and being responsive. Implications regarding the need for explicit teacher educator coursework and reflective practice opportunities are discussed as potential avenues for Ph.D. programs to consider to lessen the tensions that doctoral students may experience during their transition into the role of teacher educator.  相似文献   

Perceptions of junior doctors and undergraduate medical students as anatomy teachers: Investigating distance along the near‐peer teaching spectrum          下载免费PDF全文

Samuel Hall  Jonathan Stephens  Teu Andrade  Joseph Davids  Matthew Powell  Scott Border 《Anatomical sciences education》2014,7(3):242-247

Near‐peer teaching involves more experienced students acting as tutors and has been widely used in anatomy education. This approach has many advantages for the learner due to the social and cognitive congruence they share with the teacher, however, the influence of distance between the teacher and learner on these congruences has yet to be explored. The aim of this study was to compare the attitudes and perceptions of the student learner towards neuroanatomy review sessions taught by either a senior medical student or a junior doctor. The students were randomly assigned to an allocated tutor. All tutors used standardized material and had access to identical resources. The type of allocated tutor was swapped between the two teaching sessions and 99 student feedback forms were collected in total. The rating for the overall quality of the teaching session was not significantly different between the junior doctors and senior medical students (P = 0.11). However, criteria closely relating to social and cognitive congruence such as “enjoyment of the session,” “delivery of the teaching,” and “was it a good use of time” were all rated significantly higher for the senior medical students (P < 0.05). The results of this study suggest that small increases in distance along the near‐peer teaching spectrum have an impact upon the student's perception of their learning experience. While all teachers were suitable role models it appears that junior doctors are too far removed from their own undergraduate experiences to share congruences with pre‐clinical medical students. Anat Sci Educ 7: 242–247. © 2013 American Association of Anatomists.  相似文献   

How Birth Doulas Help Clients Adapt to Changes in Circumstances,Clinical Care,and Client Preferences During Labor     

Natalie Lea Amram  Michael C. Klein  Heidi Mok  Penny Simkin  Kathie Lindstrom  Jalana Grant 《The Journal of perinatal education》2014,23(2):96-103

This study examined how doulas adapt to challenges in client’s labors. There were 104 Canadian and 92 American doulas who responded to a survey distributed at a doula conference. We report results from open-ended questions in which doulas describe how they manage changes deviating from the mother’s birth plan and how they navigate differences of opinion between themselves and providers. Four themes emerged: giving nonjudgmental support, assisting informed decision making, acting as a facilitator, and issues with advocacy. Although 30% of doulas said that advocacy and information giving could result in conflict with providers, doulas reported working within their scope of practice and striving to be part of the team. Issues in doula responsibility and patient advocacy remain, and ongoing role clarification is needed.  相似文献   

Pedagogical approaches to exploring theory–practice relationships in an outdoor education teacher education programme     

Kathleen Clayton  Heidi Smith  Janet Dyment 《Asia-Pacific Journal of Teacher Education》2014,42(2):167-185

Understanding theory–practice relationships in pre-service teacher education is an enduring concern for many teacher educators. Drawing on data from an investigation into the theory–practice nexus in an outdoor education teacher education programme, this article examines pedagogical approaches to exploring theory and practice with pre-service teachers. The investigation, a qualitative case study, examined the views of the programme’s teacher educators (authors) using an analytical lens informed by two similar theoretical models.

The article focuses on elements that were found to be central to pedagogical approaches within the programme: self-awareness, experience, reflexivity, and a “community of learners.” While the approaches represent a departure from “theory application” and “theory–practice integration” approaches, and a move towards praxis development, the study highlighted challenges and issues including the need for teacher educators to scrutinise theory–practice relationships in their own teaching and discourse. Implications and possibilities for future practice are considered.  相似文献   

Competitive Research Grants and Their Impact on Career Performance     

Carter Bloch  Ebbe Krogh Graversen  Heidi Skovgaard Pedersen 《Minerva》2014,52(1):77-96

The role of competitive funds as a source of funding for academic research has increased in many countries. For the individual researcher, the receipt of a grant can influence both scientific production and career paths. This paper focuses on the importance of the receipt of a research grant for researchers’ academic career paths utilizing a mixed methods approach that combines econometric analysis with in-depth qualitative interviews. The analysis has novel elements both in terms of its subject (impact of funding grants on individuals’ academic career paths) and approach. The results of this study indicate that while research grants have a positive impact on the research performed under the grant itself, there are very important secondary effects on research performance through positive effects on academic career advancement. The probability of obtaining a full professorship for grant recipients is almost double that for rejected applicants, 16 percent compared to 9 percent. The probability for career advancement in general is about 9 percentage points higher for grant recipients. Qualitative interviews support these quantitative results by providing insights into how grants impact research careers, through heightened status, recognition, networking and other factors.  相似文献   

IV. Results     

Melanie Killen  Jennie Lee–Kim  Heidi McGlothlin  & Charles Stangor 《Monographs of the Society for Research in Child Development》2002,67(4):45-83

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Validation of a learning hierarchy for the mole concept     

Alan K. Griffiths  Heidi Kass  Alan G. Cornish 《科学教学研究杂志》1983,20(7):639-654

Three psychometric methods for validating learning hierarchies are applied to one data set derived from responses of grade 10 chemistry students to items representing the skills in a hypothesized hierarchy for the mole concept. Two methods which considered skills in pairs, namely the “test of inclusion” by White and Clark and the “ordering-theoretic method” by Airaisian and Bart produced generally similar results. The third method, by Dayton and Mac-ready, considered the hierarchy as a whole and produced clearer distinctions between alternative hierarchies than the first two methods. The hierarchy derived from this analysis was supported by a test for transfer of learning from subordinate to superordinate skills.  相似文献   

‘Bring on the dancers’: reconceptualising the transition from school to work     

Heidi S. Ashton  David N. Ashton 《Journal of Education & Work》2016,29(7):747-766

Our understanding of the transition from school to work has traditionally been underpinned by a three-stage model. This is one in which the first stage is a preparatory one, where the focus is on school, followed by a second transition stage and ending in a third stage, the successful entry to work. This is a model that has been challenged by work from the ‘cultural studies’ school but still informs much contemporary work. The study of freelance dancers’ entry into work reveals a very different experience of the transition. Rather than a sequence of experiences of school, preparation for work and then entry into established employment, the dancer’s experience is one of coterminus experiences of work, vocational training and family life that can start before the entry into primary education. This represents a serious challenge to the three-stage model as a general model for conceptualising transitions. Using the experience of the dancers and building on the work of Becker and Wyn, this paper explores how the concept of belonging points the way forward towards a more comprehensive conceptualisation of the transition.  相似文献