Evaluation of wrist and hip sedentary behaviour and moderate-to-vigorous physical activity raw acceleration cutpoints in older adults     

George J. Sanders  Lynne M. Boddy  S. Andy Sparks  Whitney B. Curry  Brenda Roe  Axel Kaehne 《Journal of sports sciences》2019,37(11):1270-1279

Wrist-based accelerometers are now common in assessing physical activity (PA) and sedentary behaviour (SB) in population-based studies, but there is a scarcity of raw acceleration cutpoints in older adults. The study aimed to determine and evaluate wrist-based GENEActiv (GA) and hip-based ActiGraph GT3X+ (AG) raw acceleration cutpoints for SB and moderate-to-vigorous PA (MVPA) in older adults ≥60 years of age. A laboratory-based calibration analyses of 34 healthy older adults involved receiver operator characteristic (ROC) curves to determine raw acceleration cutpoints for SB and MVPA. ROC analysis revealed an area under the curve (AUC) of 0.88 for GA SB and MVPA, and 0.90 for AG SB and 0.94 for AG MVPA. Sensitivity optimised SB and specificity optimised MVPA GA cutpoints of 57 mg and 104 mg, and AG cutpoints of 15 mg and 69 mg were also generated, respectively. Cross-validation analysis revealed moderate agreement for GA and AG SB cutpoints, and fair to substantial agreement for GA and AG MVPA cutpoints, respectively. The resultant cutpoints can classify older adults as engaging in SB or not engaging in MVPA but the sensitivity optimised SB cutpoints should be interpreted with a degree of caution due to their modest cross-validation results.  相似文献   

The anaerobic power reserve and its applicability in professional road cycling     

Dajo Sanders  Mathieu Heijboer 《Journal of sports sciences》2019,37(6):621-629

This study examined if short-duration record power outputs can be predicted with the Anaerobic Power Reserve (APR) model in professional cyclists using a field-based approach. Additionally, we evaluated if modified model parameters could improve predictive ability of the model. Twelve professional cyclists (V?O_2max 75 ± 6 ml?kg^?1?min^?1) participated in this investigation. Using the mean power output during the last stage of an incremental field test, sprint peak power output and an exponential constant describing the decrement in power output over time, a power-duration relationship was established for each participant. Record power outputs of different durations (5 to 180 s) were collected from training and competition data and compared to the predicted power output from the APR model. The originally proposed exponent (k = 0.026) predicted performance within an average of 43 W (Standard Error of Estimate (SEE) of 32 W) and 5.9%. Modified model parameters slightly improved predictive ability to a mean of 34–39 W (SEE of 29 – 35 W) and 4.1 – 5.3%. This study shows that a single exponent model generally fits well with the decrement in power output over time in professional cyclists. Modified model parameters may contribute to improving predictability of the model.  相似文献   

Physical demands and power profile of different stage types within a cycling grand tour     

Dajo Sanders  Mathieu Heijboer 《European Journal of Sport Science》2019,19(6):736-744

This study aims to describe the intensity and load demands of different stage types within a cycling Grand Tour. Nine professional cyclists, whom are all part of the same World-Tour professional cycling team, participated in this investigation. Competition data were collected during the 2016 Giro d’Italia. Stages within the Grand Tour were classified into four categories: flat stages (FLAT), semi-mountainous stages (SMT), mountain stages (MT) and individual time trials (TT). Exercise intensity, measured with different heart rate and power output based variables, was highest in the TT compared to other stage types. During TT’s the main proportion of time was spent at the high-intensity zone, whilst the main proportion of time was spent at low intensity for the mass start stage types (FLAT, SMT, MT). Exercise load, quantified using Training Stress Score and Training Impulse, was highest in the mass start stage types with exercise load being highest in MT (329, 359?AU) followed by SMT (280, 311?AU) and FLAT (217, 298?AU). Substantial between-stage type differences were observed in maximal mean power outputs over different durations. FLAT and SMT were characterised by higher short-duration maximal power outputs (5–30?s for FLAT, 30 s–2?min for SMT) whilst TT and MT are characterised by high longer duration maximal power outputs (>10?min). The results of this study contribute to the growing body of evidence on the physical demands of stage types within a cycling Grand Tour.  相似文献   

Relationships between kinematics and undulatory underwater swimming performance     

Allison J. Higgs  David L. Pease  Ross H. Sanders 《Journal of sports sciences》2017,35(10):995-1003

Undulatory underwater swimming (UUS) is one of the major skills contributing to performance in competitive swimming. UUS has two phases– the upbeat is performed by hip extension and knee flexion, and the downbeat is the converse action. The purpose of this study was to determine which kinematic variables of the upbeat and downbeat are associated with prone UUS performance in an elite sample. Ten elite participants were filmed performing three prone 20 m UUS trials. Seven landmarks were manually digitised to calculate eighteen kinematic variables, plus the performance variable– horizontal centre of mass velocity (V_COM). Mean V_COM was significantly correlated with body wave velocity (upbeat r = 0.81, downbeat r = 0.72), vertical toe velocity (upbeat r = 0.71, downbeat r = 0.86), phase duration (upbeat r = ?0.79), peak hip angular velocity (upbeat r = 0.73) and mean knee angular velocity (upbeat r = ?0.63), all significant at P < 0.05. A multiple stepwise regression model explained 78% of variance in mean V_COM. Peak toe velocity explained 72% of the variance, and mean body wave velocity explained an additional 6%. Elite swimmers should strive for a high peak toe velocity and a fast caudal transfer of momentum to optimise underwater undulatory swimming performance.  相似文献   

Why are smart people curious? Fluid intelligence,openness to experience,and interest     

Paul J. Silvia  Camilla E. Sanders 《Learning and individual differences》2010,20(3):242-245

The experience of interest is central to intrinsic motivation for learning, so it is important to understand the nature of interest and its sources. Individual differences in fluid intelligence (Gf) predict finding things more interesting, but it is possible that this effect is merely due to the overlap of Gf with openness to experience, a strong predictor of interest across many domains. The present research measured Gf, the Big Five traits, and the interestingness of contemporary poems and visual art. Latent variable models found that Gf predicted interest in both poems and pictures, even when openness and gender were included as predictors. Moreover, Gf and openness did not interact, indicating main effects rather than joint effects. The relationship between Gf and interest thus appears robust.  相似文献   

Creativity and whole school change: An investigation of English headteacher practices     

Pat Thomson  Ethel Sanders 《Journal of Educational Change》2010,11(1):63-83

Schools in England have been required to adopt and adapt an ongoing series of policy initiatives: some however are offered on an ‘opt-in’ basis. This paper examines one such ‘offer,’ that of Creative Partnerships, a programme which provides schools in designated deprived areas the opportunity to work with creative practitioners in order to change both classroom practice and whole schools. We report here on the snapshot phase of a national study, using a corpus of multi-method qualitative data from 40 schools. We suggest that headteachers saw different opportunities in the CP offer but what actually happened in the school related to three interwoven strands: the situatedness of the school, the headteacher’s stance towards change, and the architecture of change management. Our analysis, which highlights the ways in which many of the schools were unable to ‘spread and embed’ the pedagogical changes supported through CP, suggests that the majority of heads could benefit from involvement in explicit discussion about ‘unofficial’—and more democratic—approaches to leading and managing change.  相似文献   

Editorial     

Ross Sanders Editor 《Sports biomechanics / International Society of Biomechanics in Sports》2013,12(1)

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What do Schools Think Makes a Good Mathematics Teacher?     

Susan E. Sanders 《Educational studies》2002,28(2):181-191

This paper describes the attributes of good mathematics teachers in the UK. These are derived from the material provided by 80 schools to applicants for mathematics teaching posts in the UK. The assumption is made that schools are trying to recruit the very best teacher and hence will have listed those attributes that they believe good teachers to have. Many of the attributes sought are not specifically about the teaching of mathematics. Indeed much about competency in the teaching of mathematics is assumed and not made explicit. The requirements of schools are compared and contrasted with the Standards detailed in current Initial Teacher Training requirements and the Career Entry Profile used by newly qualified teachers.  相似文献   

On Food,Farming and Land Management: Towards a research agenda to reconnect urban and rural lives     

Justin Dillon  Mark Rickinson  Dawn Sanders  Kelly Teamey 《International Journal of Science Education》2013,35(11):1359-1374

Science education has a key role to play in helping people to develop their understanding of the local and global dimensions of food, farming and land management. Based on a review of the literature on what is known about young people’s (3–19) views towards and learning about these topics, a research agenda is outlined for consideration by the science education research community.  相似文献   

A Comparison of Lecture-Based and Challenge-Based Learning in a Workplace Setting: Course Designs,Patterns of Interactivity,and Learning Outcomes     

Timothy K. O'Mahony  Nancy J. Vye  John D. Bransford  Elizabeth A. Sanders  Reed Stevens  Richard D. Stephens 《学习科学杂志》2013,22(1):182-206

We describe findings from a research partnership involving a global airline manufacturing company (The Boeing Company), and learning scientists and aeronautical engineers from the University of Washington. Our starting point for the partnership focused on an 8-hour introductory composites course that was designed for company employees. In phase one, learning scientists observed the company's course development activities and the course as taught by company experts. In phase two, we collaboratively designed and implemented a quasi-experimental study comparing two approaches to teaching. One involved lectures with PowerPoint slides. The second, a “challenge-based” learning approach, combined a set of composites-relevant challenges with individual, small-group, and large-group collaborative inquiry. Comparisons between these methods showed greater interaction among participants in the challenge-based group. In addition, the challenge-based group performed significantly better on posttest items requiring integration and synthesis of concepts. Increased interactivity in the challenge course provided opportunities for participants to articulate connections among concepts and may have contributed to the challenge participants' better synthesis of learned concepts. This work highlighted the benefits for learning scientists of collaborating with industry partners to explore learning in workplace settings, as these settings provide illuminating contrasts to the structures of teaching, learning, and assessment found in schools.  相似文献