Examining the influence of grip type on wrist and club head kinematics during the golf swing: Benefits of a local co-ordinate system     

Howie J. Carson  Jim Richards  Bruno Mazuquin 《European Journal of Sport Science》2019,19(3):327-335

Wrist movements have been identified as an important factor in producing a successful golf swing, with their complex motion influencing both club head velocity and orientation. However, a detailed analysis of wrist angles is lacking in the literature. The purpose of this study was to determine kinematics across wrists and club head characteristics during the golf swing under weak, neutral and strong grip conditions. Twelve professional male golfers executed 24 shots using a driver under three grip conditions. A six degrees of freedom analysis of the hand with respect to the distal forearm was performed using a 10-camera three-dimensional motion capture system. Differences in joint angles were explored using repeated measures ANOVAs at key swing events (onset, top of backswing and impact), in addition club head velocity and clubface angle at impact were also explored. Main findings revealed significant differences in flexion/extension and internal/external rotation for both wrists at all swing events, whereas fewer significant interactions were found in ulnar/radial deviation across grips for both wrists at all events. Clubface angle only differed significantly between the weak and the strong and neural grips, presenting a more ‘open’ clubface to the intended hitting direction. This study is the first to explore tri-planar wrist movement and the effect of different grips, such analysis has implications for coaching knowledge and practice and should inform future research into different aspects of skill, technique analysis and may inform injury mechanisms/prevention.  相似文献   

Physiological responses in different intensities of resistance exercise – Critical load and the effects of aging process     

Vivian Maria Arakelian  Cássia da Luz Goulart  Renata Gonçalves Mendes  Nuno Manoel de Sousa  Renata Trimer  Solange Guizilini 《Journal of sports sciences》2019,37(12):1420-1428

Aim was to identify critical load (CL) in young and elderly apparently healthy male cohorts. To contrast the metabolic, cardiovascular and perceptual responses on CL according to age. We evaluated 12 young (23 ± 3 years) and 10 elderly (70 ± 2 years) apparently healthy active males, who underwent: (1) 1 repetition maximum (1RM) test on a 45° Leg Press; (2) on different days, three high-intensity resistance exercise constant load tests (60%, 75% and 90% 1RM) until fatigue (Tlim). Absolute values of both the CL asymptote and curvature constant (kg) were significantly lower in elderly subjects (P < 0.05). In contrast, elderly subjects demonstrated a significantly higher number of repetitions at CL when compared with young subjects (P < 0.05). As expected, oxygen uptake (VO₂) and heart rate (HR) during maximal aerobic exercise testing were significantly reduced in older subjects. However, percent-predicted aerobic capacity were higher in older subjects (P < 0.05). In addition, blood lactate ([La^?]) corrected to Tlim and rating of perceived exertion values were greater in younger subjects at all intensities (P < 0.05). These findings, despite reduced force production in older subjects, endurance-related parameters are well preserved according to age-adjusted percent-predicted values in apparently healthy males.  相似文献   

Initial Validity and Reliability of the Portuguese Borg Rating of Perceived Exertion 6-20 Scale     

Luana L. Cabral  Fábio Y. Nakamura  Joice M. F. Stefanello  Luiz C. V. Pessoa  Bruno P. C. Smirmaul  Gleber Pereira 《Measurement in physical education and exercise science》2020,24(2):103-114

ABSTRACT

The aims of this study were to perform the cross-cultural adaptation of the Borg Rating of Perceived Exertion (RPE) 6–20 Scale to Brazilian Portuguese language and to start testing its validity and reliability. After performing the cross-cultural adaptation of the Scale, concurrent and discriminative validity, and reliability were determined on a treadmill in young (18–30 years) and older adult women (60–75 years). Considering young and older adult women, RPE presented high and moderate positive correlation with heart rate and high and low positive correlation with oxygen consumption, respectively. Older adult women presented RPE (11 ± 2) significantly higher than young ones (8 ± 1) exercising at the same absolute intensity. Intraclass coefficient correlation was excellent for RPE to young and older adult women. The Scale presented concurrent validity only to young adult women, whereas it presented discriminative validity between such groups of women. Moreover, the scale is reliable to young and older adult women.  相似文献   

Performance equivalency between computer‐based and traditional pen‐and‐paper assessment: A case study in clinical anatomy          下载免费PDF全文

Bruno Guimarães  José Ribeiro  Bernardo Cruz  André Ferreira  Hélio Alves  Ricardo Cruz‐Correia  Maria Dulce Madeira  Maria Amélia Ferreira 《Anatomical sciences education》2018,11(2):124-136

The time, material, and staff‐consuming nature of anatomy's traditional pen‐and‐paper assessment system, the increase in the number of students enrolling in medical schools and the ever‐escalating workload of academic staff have made the use of computer‐based assessment (CBA) an attractive proposition. To understand the impact of such shift in the assessment method, an experimental study evaluating its effect on students’ performance was designed. Additionally, students’ opinions toward CBA were gathered. Second‐year medical students attending a Clinical Anatomy course were randomized by clusters in two groups. The pen‐and‐paper group attended two sessions, each consisting of a traditional sectional anatomy steeplechase followed by a theoretical examination, while the computer group was involved in two similar sessions conducted in a computerized environment. At the end of each of the computer sessions, students in this group filled an anonymous questionnaire. In the first session, pen‐and‐paper group students scored significantly better than computer‐group students in both the steeplechase (mean ± standard deviation: 66.00 ± 14.15% vs. 43.50 ± 19.10%; P < 0.001) and the theoretical examination (52.50 ± 12.70% vs. 39.00 ± 21.10%; P < 0.001). In the second session, no statistically significant differences were found for both the steeplechase (59.50 ± 17.30% vs. 54.50 ± 17.00%; P = 0.085) and the theoretical examination (57.50 ± 13.70% vs. 54.00 ± 14.30%; P = 0.161). Besides, an intersession improvement in students’ perceptions toward CBA was registered. These results suggest that, after a familiarization period, CBA might be a performance equivalent and student accepted alternative to clinical anatomy pen‐and‐paper theoretical and practical examinations. Anat Sci Educ 11: 124–136. © 2017 American Association of Anatomists.  相似文献   

Equality of educational opportunity at racially isolated schools: Balancing the need for teacher certification with teacher shortage     

James E. Bruno  George A. Marcoulides 《The Urban Review》1985,17(3):155-165

Providing for equality of educational opportunity at racially isolated schools continues to be an important area of concern for educational policy makers. Quality teachers to staff instruction programs at these schools is essential to promoting equal opportunity for minority groups. Unfortunately, these schools continue to suffer chronic teacher shortages. Recently, California implemented a teacher certification examination (CBEST) designed specifically to improve the quality of teachers entering the profession. An unintended consequence of the certification movement was the exacerbation of the teacher shortage problem at racially isolated schools. The purpose of this study is to examine the characteristics of teachers who passed and failed the CBEST. The study finds that failure rates are highest among minority teachers that are presently employed. The study also finds that the mathematics knowledge subscale scores best discriminate those passing from those failing the CBEST. An analytical approach for determining optimal cutoff scores on the CBEST which balances the need for certification with the problem of teacher shortage is proposed.  相似文献   

Mathematics attainment at inner-city schools: Establishing the need for systematic formative evaluation practices     

Robert R. Barner  Dr. James E. Bruno 《The Urban Review》1991,23(4):251-270

Recently there has been a great amount of research and professional educator interest in at-risk, poor academically attaining students, especially low socioeconomic status students at U.S. inner-city schools. A major factor that has been hypothesized in the research literature as being associated with poor academic attainment is the lack of critical and timely instructional feedback or formative evaluation. Using a sample of 130 inner-city senior high school students, the perceived quality and quantity of formative evaluation received by these students at their elementary and secondary school levels were assessed. in addition, each student was given a mathematics (pre-algebra) assessment using both a one and two-dimensional format (recognition plus confidence) to determine present levels of mathematics attainment. Finally data were collected from the cumulative grade-level folders of a subset of these students, especially norm-referenced data (NRT) in mathematics, to examine their relationship to scores on the Scholastic Aptitude Test-Quantitiative portion. The study finds that in addition to extremely poor mathematics attainment and poor formative evaluation practices there is little association between SAT (quantitative) scores and the grade-level (mathematics) NRT scores. These findings suggest that parents cannot depend on traditional norm-referenced measures to indicate actual mathematics attainment as these students are progressing through the schools. These findings also challenge urban school administrative personnel to reassess the use of NRT measures to monitor student progress and to develop more comprehensive and systematic formative evaluation procedures and practices for individual students as they progress through each grade level.  相似文献   

Doing time—Killing time at school: An examination of the perceptions and allocations of time among teacher-defined at-risk students     

Dr. James E. Bruno 《The Urban Review》1995,27(2):101-120

“Doing time” is an expression that is generally associated with prisoners who are disconnected from society and find themselves counting the days and minutes until their release from prison. In many respects, at-risk students attending our nation's large, urban, inner-city middle and high schools also consider themselves as not being connected to school or society and to be “doing time” in the classroom. Qualitative and subjective impressions of doing time at school have become the theme of many movies, books, and research articles. This study extends this qualitative type of research by quantitatively framing time allocation preferences and temporal dominance characteristics for a large sample of teacher-perceived “at-risk” students at several large urban high school sites. A sample of normal attaining students at the same school site served as a comparison group. The findings of this research effort generally support other more qualitative studies and indicate that there are strong preferences in at-risk students toward nondirected time-consuming activities (i.e., hanging out, video games, watching TV, etc.) with low-directed to nondirected time preference ratios. Normal attaining students had the reverse pattern, i.e., higher-directed to nondirected time preference ratios and higher preferences toward directed time-consuming activities that might be associated with investments in the schooling process (homework, studying, personal development, etc.). Interpretation of the circles test, a projective psychological procedure for establishing temporal dominance for at-risk students, revealed a general lack of recognition and connectiveness between past, present, and future events in their life and weak temporal dominance or orientation toward the future.  相似文献   

AIDA: a methodology independent support tool for educational software authoring     

António José Mendes  Teresa Mendes 《Education and Information Technologies》1996,1(1):55-74

Many authoring tools have been proposed in an attempt to find more effective ways to face the challenge of developing educational software. However, most of them are reported to be restrictive, since they are strongly connected to a specific educational software development methodology. The AIDA (Ambiente Integrado para o Desenvolvimento de Aplicações educacionais) authoring environment was developed at the University of Coimbra having as its main objectives the support of most of the activities involved in authoring and making educational software development easier. The AIDA system is based on a design module, i.e. a prototyping tool allowing the creation of Windows-based software, including multimedia features. The system assists evaluation activities and it caters also for support on translation and cultural adaptation, as well as on the reutilization of educational materials. The use of the AIDA environment is illustrated by three small examples using different development methodologies.  相似文献   

Obituary Giorgio Tomaso Bagni (1958–2009)     

Bruno D’Amore 《Educational Studies in Mathematics》2010,73(1):73-74

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Reflective practicum in higher education: the influence of the learning environment on the quality of learning     

Andreina Bruno  Giuseppina Dell’Aversana 《Assessment & Evaluation in Higher Education》2018,43(3):345-358

Sustaining students in becoming reflective practitioners is considered as a valued outcome of higher education. The paper aims to evaluate the impact of the learning environment conditions inspired by Schön’s theory of reflective practicum, by discussing a case study of a master’s degree class. The learning environment was designed to sustain reflective practice and meaningful engagement through professional practice simulation, problem-based learning and reflective writing. Unlike much of the research into reflective learning, the quality of learning was evaluated by assessing the use of reflective practice in students’ weekly journaling, rather than measuring students’ satisfaction or perceptions of effectiveness. Two hundred and six journal entries of 23 students were assessed and used in a quantitative analysis based on a linear mixed-effects model. Findings indicated that the reflective practicum has an incremental effect on students’ reflective practices and that reflective practice is dynamic and sensitive to specific learning environment conditions. In conclusion, students’ co-responsibility of the learning environment allowed by the professional practice simulation appears to foster meaningful and reflective learning. Conversely, conditions that stimulate only cognitive engagement have little impact or even inhibit reflective practices. Practical implications of the use of reflective journal are discussed.  相似文献